1976 Tangshan Earthquake
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The 1976 Tangshan earthquake () was a 7.6 earthquake that hit the region around
Tangshan Tangshan () is a coastal, industrial prefecture-level city in the northeast of Hebei province. It is located in the eastern part of Hebei Province and the northeastern part of the North China Plain. It is located in the central area of the Boha ...
,
Hebei Hebei or , (; alternately Hopeh) is a northern province of China. Hebei is China's sixth most populous province, with over 75 million people. Shijiazhuang is the capital city. The province is 96% Han Chinese, 3% Manchu, 0.8% Hui, an ...
, China, at 3:42 a.m. on 28 July 1976. The maximum intensity of the earthquake was XI (''Extreme'') on the
Mercalli scale The Modified Mercalli intensity scale (MM, MMI, or MCS), developed from Giuseppe Mercalli's Mercalli intensity scale of 1902, is a seismic intensity scale used for measuring the intensity of shaking produced by an earthquake. It measures the eff ...
. In minutes, 85 percent of the buildings in Tangshan collapsed or were rendered unusable, all services failed, and most of the highway and railway bridges collapsed or were seriously damaged. The official report claimed 242,769 deaths and 164,851 serious injuries in Tangshan, but when taken into account the missing, the injured who later died and the deaths in nearby Beijing and Tianjin, scholars accepted at least 300,000 died, making it the deadliest earthquake in China and among the top disasters in China by death toll.


The earthquakes

The Tangshan earthquake was composed of two main shocks. The first struck at 3:42:56 in the morning (local time), approximately 12 km under the southern part of Tangshan.. The was initially estimated at 8.1, subsequently recalculated to be 7.6 on the standard scale. However, that scale measures only the ''total'' energy released by an earthquake, and earthquakes vary in how much of that energy is converted to seismic shaking. The Tangshan quake, being relatively shallow, converted much of its energy to surface shaking, and on the (surface magnitude) scale it also measured 7.6. (7.8 on the Chinese surface magnitude scale.) This "occurred on a near vertical right-lateral strike-slip fault, striking N40°E", the block on the southeast side sliding about three meters to the southwest.. This resulted from tectonic compression on a nearly west–east axis. Surface rupturing occurred in five ''en echelon'' segments extending eight kilometers through the center of Tangshan. The second main shock, with a magnitude 7.0 , or 7.4 , struck that afternoon at 18:45 near Luanhsien (Luanxian), about 70 km to the east-northeast ("B" on the intensity map in the next section), just south of the northeastern end of the Tangshan fault. This occurred in a zone of north-northwest striking conjugate faults that cut across the north end of the Tangshan fault. The left-lateral motion here, along with the right-lateral motion on the Tangshan fault, suggests that as the crustal blocks to the west and east are compressed together the block between these two earthquakes is being squeezed out to the south. A long sequence of aftershocks followed, with twelve of magnitude 6 or greater.. The first of these struck just three and a half hours after the initial shock, at 7:17, at the southern end of Tangshan fault, near
Ninghe Ninghe District (), formerly Ninghe County, is a district of the municipality of Tianjin, People's Republic of China, located in the rural northeast part of the municipality. Administrative divisions There are 11 towns and 3 townships A townsh ...
("C" on the map in the section below), with a magnitude of 6.2 . Another significant aftershock () occurred in November near Ninghe. Most aftershocks occurred between these end points, in a zone 140 km long and about 50 km wide. Many buildings were further damaged by the aftershocks.. The aftershock zone remains seismically active in the twenty-first century. Earthquakes measuring 4.5 to 4.7 occurred in 2012, 2016 and 2019. On 12 July 2020, a 5.1 strike-slip earthquake struck the northern part of the Tangshan Fault. It produced its own sequence of aftershocks that ended on 17 July 2020. The earthquake only caused minor damage to buildings in Tangshan. Its occurrence stirred a debate among scientists into whether the recent earthquakes are aftershocks of the 1976 event or are background seismicity.


Damage

The damage done by an earthquake depends primarily on two factors. First, the ''intensity of shaking'', which depends mainly on the magnitude of the earthquake rupture, the distance from the
epicenter The epicenter, epicentre () or epicentrum in seismology is the point on the Earth's surface directly above a hypocenter or focus, the point where an earthquake or an underground explosion originates. Surface damage Before the instrumental pe ...
, and the nature of the local soil and topography, with soft soils (e.g., sediments and fill) more likely to amplify the intensity and duration of the shaking. Second, the ''design and construction of the structures'' being shaken, with houses built of adobe or stone, wooden houses without a well-built frame, and unreinforced masonry construction being especially vulnerable. The seismic risk had been greatly underestimated and almost all buildings and structures were designed and built without seismic considerations. As a result, Tangshan was "mainly a city of unreinforced brick buildings", sitting right on top of a major fault line. The power (magnitude) of the Tangshan earthquake is indicated by the extent of where it was felt: up to away, across most of northeastern China, and even in Mongolia and Korea. In and around Beijing, from the epicenter, the shaking reached an intensity of VI on the Chinese intensity scale (similar to the
Modified Mercalli Intensity Scale The Modified Mercalli intensity scale (MM, MMI, or MCS), developed from Giuseppe Mercalli's Mercalli intensity scale of 1902, is a seismic intensity scale used for measuring the intensity of shaking produced by an earthquake. It measures the eff ...
), with nearly 10% of all buildings damaged, and at least 50 fatalities. The economic loss totaled to 10 billion yuan.


Intensity XI and X zone

The rupture occurred under the southern part of the city, and propagated northeastward on a fault that runs through the middle of the city. The maximum intensity was "XI" (eleven) on the 12-degree Chinese scale. Nearly every building and structure in the city collapsed, wholly or partially, infrastructure was severely damaged, and essential services such as electric power, water supply, and communications were entirely knocked out. This area of maximum damage – the meizoseismal area – was approximately long and from 3.5 to 5.5 km wide, centered roughly along the railway. The area of intensity X shaking – where only new, one-story brick buildings were merely "damaged or slightly damaged", the rest being severely damaged or worse – was 36 km long and 15 km across.. In this "high intensity" zone (intensity X and XI, within the red contour on the map) 20 highway bridges and five railway bridges cross the Douhe River in Tangshan; only six survived with only minor damage.


Intensity IX and VIII zone

Shaking of intensity IX (or greater) occurred in a zone roughly long and (about 1800 km2, inner orange contour on the map), and also around the aftershocks at Luanxian and Ninghe. In this zone most buildings classified as Class III (well-built buildings of wood, masonry, or reinforced concrete) survived, but many Class II buildings (typically old wood-frame buildings lacking a well-built frame, and quite common outside of the cities) were destroyed, while a majority of Class I buildings (built of adobe or stone) were destroyed. Further out (to the outer orange contour), and around the city of Tianjin and a few isolated patches, intensity VIII shaking mostly affected Class I buildings (more than half destroyed), bridges, and tall brick chimneys. Railway track was also subject to bending or displacement, depending on soil conditions.


Intensity VII zone

The zone of intensity VII shaking – inside the dark brown contour – marks the extent of moderate damage, where many Class I structures (of weak design or construction) were damaged but only "few"—between 10% and 30%—were destroyed, and only a "few" Class two buildings damaged. This ellipsoid zone extended about 75 km north and south of Tangshan and 120 km east and west, from about 25 km short of Beijing to short of Qinhuangdao City (which had anomalously higher shaking), and from the Sea of Bohai in the south and southwest to just north of Zunhua. The north–south shortening of this zone is attributed to buttressing by the bedrock of the Yanshin mountains. Significant damage occurred beyond this in the VI zone, but (like in Beijing) affected less than 10% of the buildings, or occurred in small localized areas.


Coal mines

Mining coal is Tangshan's principal industry, and when the quake struck around 10,000 miners were underground. For the most part the mine roadways (tunnels) were not seriously damaged, but with the loss of electrical power there was no illumination (aside from headlamps), no ventilation, and no working lifts.. It is reported that most miners escaped within hours, but that some did not reach the surface until two weeks later. Most of the damage to the vertical shafts occurred within the first 50 meters, where they pass through the water-bearing alluvium. In many cases the concrete liner built to keep out the water cracked (particularly where not built properly), allowing a much greater inflow of water. Coupled with damage to the underground drainage system and lack of power to drive the pumps, many of the various mines flooded. Some electrical power to the mines was restored in three days, and some coal production resumed within ten days.. However, de-watering, overhauling of flooded electrical equipment, and rebuilding of surface buildings and structures continued for a year and a half; the pre-earthquake level of production was not reached until the end of 1977.


Railways

The Beijing–Shanhaiguan Railway (built in 1887) is a double-track Class I trunk line that runs from Beijing southeast to
Tianjin Tianjin (; ; Mandarin: ), alternately romanized as Tientsin (), is a municipality and a coastal metropolis in Northern China on the shore of the Bohai Sea. It is one of the nine national central cities in Mainland China, with a total popul ...
and
Tanggu Tanggu District () was a district in the Tianjin municipality, now part of the Binhai New Area. It is on the Hai River where it enters the Bohai Sea, and is a port for Tianjin, which is about upriver. The Tianjin Economic-Technological Develo ...
, then turns northeast to cross the Yongdingxin River and its estuary to run to
Ninghe Ninghe District (), formerly Ninghe County, is a district of the municipality of Tianjin, People's Republic of China, located in the rural northeast part of the municipality. Administrative divisions There are 11 towns and 3 townships A townsh ...
and then Tangshan. From Tangshan it continues northeast and then east to Chengli, and then to
Qinhuangdao Qinhuangdao (; ) is a port city on the coast of China in northern Hebei. It is administratively a prefecture-level city, about east of Beijing, on the Bohai Sea, the innermost gulf of the Yellow Sea. Its population during the 2020 national ...
and
Shanhaiguan Shanhai Pass or Shanhaiguan () is one of the major passes in the Great Wall of China, being the easternmost stronghold along the Ming Great Wall, and commands the narrowest choke point in the Liaoxi Corridor. It is located in Shanhaiguan Di ...
. This is the principal connection of Beijing, Tianjin, and Tangshan to the seaports, and to
Northeast China Northeast China or Northeastern China () is a geographical region of China, which is often referred to as "Manchuria" or "Inner Manchuria" by surrounding countries and the West. It usually corresponds specifically to the three provinces east of t ...
. The
Tongxian Tongzhou District (, alternate spellings ''Tungchow'' ''Tungchou'' (T'ung-chou), or Tong County during 1914–1997) is a district of Beijing. It is located in southeast Beijing and considered the eastern gateway to the nation's capital. Downt ...
to Tuozitou (within modern-day
Luan County Luanzhou (), formerly Luan County (), is a county-level city in the east of Hebei province, China. It is under the administration of the Tangshan city. Administrative divisions Subdistricts: *Luanhe Subdistrict (), Gucheng Subdistrict (), Luanchen ...
) Railway (built in 1976) is a single-track Class I trunk line that runs east from the eastern outskirts of Beijing to where it meets the Beijing to Shanhaiguan line northeast of Tangshan (near the epicenter of the M 7.1 quake). All of this was built "with no consideration for earthquake resistant design",. although some "earthquake resistance measures" for large and medium bridges were applied following the 1975 Haicheng earthquake. These vital arteries (and other railways and branch lines) were seriously damaged by the earthquakes, mainly in the areas of intensity IX or greater shaking. (This includes a large area around Tangshan quake, and areas around Ninghe and Luanhsien following the M 6.9 and M 7.4 aftershocks.) At the time of the main quake there were 28 freight trains and seven passenger trains traveling on the Beijing–Shanhaiguan line in the affected area; seven freight trains and two passenger trains derailed due to derangement of the rails, mostly south of Tangshan where the line was built on loose
alluvium Alluvium (from Latin ''alluvius'', from ''alluere'' 'to wash against') is loose clay, silt, sand, or gravel that has been deposited by running water in a stream bed, on a floodplain, in an alluvial fan or beach, or in similar settings. Alluv ...
,
diluvium Diluvium is an archaic term applied during the 1800s to widespread surficial deposits of sediments that could not be explained by the historic action of rivers and seas. Diluvium was initially argued to have been deposited by the action of extra ...
, and occasional stretches of loose sand. In many of these cases – and also similar cases northeast of Tangshan, and on the Tongxian–Tuozitou line east of Fengrun – the railway embankment slumped due to weak soils. In other cases the embankment held, but transverse compression of the rails caused them to buckle. Railway operations were further impaired by the loss of communications (including signalling) and water supply (for the steam locomotives), in both cases due mainly to collapse of buildings and loss of electrical power. However, the most serious damage, taking the most manpower and longest time to repair, was that involving bridges. Most difficult was where soft or liquefied soil allowed the bank to slide into the river, shifting the abutments. A more frequent problem was where an approach embankment subsided, typically leaving the rails suspended from the abutment. There were numerous cases where concrete piers and abutments were damaged due to inadequate design and construction; bridges that were strengthened following the Haicheng earthquake survived with only slight damage. It was observed that at intensity VII and above damage to the roadbed was correlated mainly with loose soil and a high water table. Conversely, bridges and rails in Tangshan City, built on dense soil with a deep water table, were largely undamaged even though subject to intensity XI shaking. Over forty-two thousand people were mobilized to quickly effect emergency repair of the railways. The Tongxian-Tuozitou line was opened for traffic on 3 August, single track of the Beijing-Shanhaiguan line opened on 7 August, and both tracks on 10 August, albeit at restricted speeds over temporary bridges and at other places where repairs were not yet complete.


Death toll

The official report claimed 242,769 deaths and 164,851 serious injuries in Tangshan, but when take into account the "missing", the injured who later died and the deaths in nearby Beijing and Tianjin, scholars accepted at least 300,000 died, making it the deadliest earthquake in China and among the top disasters in China by death toll. Unofficial estimates of the death toll varied widely, and generally lack a clear authoritative basis.


Early reports

One of the earliest reports outside of China came on 28 July 1976 from the ''International Tsunami Information Center'', reporting that a "violent" earthquake, initially estimated at magnitude 8.1, had struck "in the vicinity of Peking" (Beijing). Center Director Dr. George Pararas-Carayannis was reported as saying that "if the quake hit in a populated area reports of considerable damage could be expected." News reports the next day located the quake "about southeast of Peking and northeast of Tientsen" (Tianjin); i.e., "almost precisely in Tangshan". The Chinese Communist party's Central Committee also broadcast a statement that the quake "caused great losses to people's life and property". One of the first reports from Tangshan said "nearly every building in the city ... was flattened." There were several reports of 50 people killed in Beijing, a from the epicenter. According to author Stephen Spignesi, a "couple of days" after the quake Dr. Pararas-Carayannis gave
United Press International United Press International (UPI) is an American international news agency whose newswires, photo, news film, and audio services provided news material to thousands of newspapers, magazines, radio and television stations for most of the 20th ...
(UPI) an estimate of to deaths, based on a similar sized earthquake in Shaanxi province in 1556 that caused 830,000 deaths. Pararas-Carayannis' current web page says only that "it was fairly accurately estimated that there were at least people dead," without mentioning by whom or on what basis this estimate was made. In August the Nationalist Chinese government in
Taiwan Taiwan, officially the Republic of China (ROC), is a country in East Asia, at the junction of the East and South China Seas in the northwestern Pacific Ocean, with the People's Republic of China (PRC) to the northwest, Japan to the nort ...
announced that, according to their agents in China, the death toll was over , with about 900,000 injured. They also reported that "almost all buildings in Tangshan were leveled", and 80 percent of homes and buildings in Tianjin "suffered damage to some extent". The following January (1977) the Nationalists released a document they said had been presented at an emergency conference on relief work the previous August by the Hopeh Provincial Committee of the party and the Hopeh Revolutionary Committee. According to this document: "in such seriously stricken areas as Tangshan municipality, and Fengnan and Feng-yun, there were persons dead. Some 79,000 persons were seriously injured, and some 700,000 persons suffered various degrees of injuries." Though these figures have been widely cited, it does not appear there has ever been inquiry into how they were derived, of whether they were an initial estimate (made in the first few days following the quake), or had a more solid basis. In following June it was reported that the Chinese authorities had briefed seismologist Cinna Lomnitz about Tangshan. It was noted that though no figures were provided, they did not deny any published estimates.


Official figures

A 1988 book by several members of the Chinese State Seismological Bureau states that people died in the quake, which reflects the official figure reported by the state-run
Xinhua News Agency Xinhua News Agency (English pronunciation: )J. C. Wells: Longman Pronunciation Dictionary, 3rd ed., for both British and American English, or New China News Agency, is the official state news agency of the People's Republic of China. Xinhua ...
.. A webpage of the Chinese Earthquake Administration dated 2009 also attributes " deaths and 164,851 serious injuries" to the Tangshan quake based on an early 1982 study. There are various reports that the "official death toll was later given by the Chinese government as ", without specifying a source. As of 2017, the Tangshan Earthquake Memorial Wall contained the names of 246,465 victims, who were registered by relatives.


Political aspects

The remarkably low death toll of the Haicheng earthquake the previous year – initially said to be fewer than 300, much later estimated at a still very modest 2,041. – had been credited to measures taken in response to an accurate and timely prediction. This was touted as demonstrating the validity of the Chinese methods of earthquake prediction (including inspiration from " Mao Zedong Thought") and "the superiority of our country's socialist system!" With China in the midst of the
Cultural Revolution The Cultural Revolution, formally known as the Great Proletarian Cultural Revolution, was a sociopolitical movement in the People's Republic of China (PRC) launched by Mao Zedong in 1966, and lasting until his death in 1976. Its stated goal ...
, "belief in earthquake prediction was made an element of ideological orthodoxy that distinguished the true party liners from right wing deviationists", and it was everyone's duty to criticize those who doubted the feasibility of earthquake prediction. As a backdrop to this, and of deep concern to the Chinese Communist Party, was a collectively recognized but unvoiced awareness that in traditional Chinese belief, natural disasters are considered disruptions in the natural order of "heaven" (
Tian ''Tiān'' () is one of the oldest Chinese terms for heaven and a key concept in Chinese mythology, philosophy, and religion. During the Shang dynasty (17th―11th century BCE), the Chinese referred to their supreme god as '' Shàngdì'' (, "Lor ...
) and may signify the loss of legitimacy (the " mandate of heaven") of the current government. This view was underlined by a magnitude 6.7
earthquake An earthquake (also known as a quake, tremor or temblor) is the shaking of the surface of the Earth resulting from a sudden release of energy in the Earth's lithosphere that creates seismic waves. Earthquakes can range in intensity, from ...
in southwestern China just three weeks later. On the other hand, an ongoing mass education campaign before the quake showed that the government was aware and concerned, and the prompt and massive response following the quake demonstrated the government's competence to alleviate suffering and restore normal production, drawing on resources from across the nation. This was contrasted with the hardships faced by disaster victims (especially the poor) under previous regimes, where assistance was lacking.
Mao Zedong Mao Zedong pronounced ; also romanised traditionally as Mao Tse-tung. (26 December 1893 – 9 September 1976), also known as Chairman Mao, was a Chinese communist revolutionary who was the founder of the People's Republic of China (PRC) ...
was already ailing at the time of the earthquake. In the event, he died only six weeks later on September 9, 1976, ushering the downfall of the Gang of Four and bringing the Cultural Revolution to an end.


Geology

Tangshan lies at the northern edge of the Beijing-Tianjin-Tangshan Plain, an alluvial plain that stretches from
Beijing } Beijing ( ; ; ), alternatively romanized as Peking ( ), is the capital of the People's Republic of China. It is the center of power and development of the country. Beijing is the world's most populous national capital city, with over 21 ...
to the Sea of Bohai. This plain – the northeastern corner of the great North China Plain – is where sediments eroded from the
Yanshan mountains The Yan Mountains, also known by their Chinese name Yanshan, are a major mountain range to the north of the North China Plain, principally in the province of Hebei. The range rises between the Chaobai River on the west and the Shanhai Pass on ...
to the north have filled in the ancient Sea of Bohai, with Tangshan near where the shore was about 4,000 years ago. To the south these sediments have formed a layer of weak soils as much as three kilometers thick. At Tangshan and northward these sediments are thinner where the underlying strata crops out to form isolated hills. This underlying strata is a thick (typically 10 km) layer of mainly sedimentary strata such as
limestone Limestone ( calcium carbonate ) is a type of carbonate sedimentary rock which is the main source of the material lime. It is composed mostly of the minerals calcite and aragonite, which are different crystal forms of . Limestone forms whe ...
and
sandstone Sandstone is a clastic sedimentary rock composed mainly of sand-sized (0.0625 to 2 mm) silicate grains. Sandstones comprise about 20–25% of all sedimentary rocks. Most sandstone is composed of quartz or feldspar (both silicates) ...
, with large deposits of coal.. Tangshan is located particularly over a northeast oriented
syncline In structural geology, a syncline is a fold with younger layers closer to the center of the structure, whereas an anticline is the inverse of a syncline. A synclinorium (plural synclinoriums or synclinoria) is a large syncline with superimpose ...
, a fold in the sedimentary strata that has brought massive deposits of coal close enough to the surface to be mined. In this area the overlying alluvium varies in thickness from several meters to around . Underlying all this is the ancient bedrock of different kinds of
metamorphic Metamorphic rocks arise from the transformation of existing rock to new types of rock in a process called metamorphism. The original rock (protolith) is subjected to temperatures greater than and, often, elevated pressure of or more, causi ...
rock (such as
schist Schist ( ) is a medium-grained metamorphic rock showing pronounced schistosity. This means that the rock is composed of mineral grains easily seen with a low-power hand lens, oriented in such a way that the rock is easily split into thin flakes o ...
,
gneiss Gneiss ( ) is a common and widely distributed type of metamorphic rock. It is formed by high-temperature and high-pressure metamorphic processes acting on formations composed of igneous or sedimentary rocks. Gneiss forms at higher temperatures an ...
,
quartzite Quartzite is a hard, non- foliated metamorphic rock which was originally pure quartz sandstone.Essentials of Geology, 3rd Edition, Stephen Marshak, p 182 Sandstone is converted into quartzite through heating and pressure usually related to tect ...
,
granulite Granulites are a class of high-grade metamorphic rocks of the granulite facies that have experienced high-temperature and moderate-pressure metamorphism. They are medium to coarse–grained and mainly composed of feldspars sometimes associated ...
, etc.) that form the Eastern Block of the
North China Craton The North China Craton is a continental crustal block with one of Earth's most complete and complex records of igneous, sedimentary and metamorphic processes. It is located in northeast China, Inner Mongolia, the Yellow Sea, and North Korea. Th ...
. This craton (see figure) was formed approximately two billion years ago by the collision of two major crustal blocks that left a belt of uplifted mountains – the Central (China) Orogenic Belt (COB) – that crosses China approximately southwest to northeast, passing just west and north of Beijing. Just north of Zunhua another
orogenic belt An orogenic belt, or orogen, is a zone of Earth's crust affected by orogeny. An orogenic belt develops when a continental plate crumples and is uplifted to form one or more mountain ranges; this involves a series of geological processes collecti ...
, the east–west trending Yanshan mountain fault-fold belt (also known as the Yanshan seismic belt) marks the northern edge of the North China Craton (and of the alluvial plain). It is also the location of over half of the destructive earthquakes in Hebei province,. as under the plain several fault zones (oriented parallel to the Central Orogenic Belt) terminate against the Yanshan mountains. Many of these faults are ancient, but have been reactivated by the force transmitted from the collision of the
Indian Plate The Indian Plate (or India Plate) is a minor tectonic plate straddling the equator in the Eastern Hemisphere. Originally a part of the ancient continent of Gondwana, the Indian Plate broke away from the other fragments of Gondwana , began mov ...
against the
Eurasian Plate The Eurasian Plate is a tectonic plate that includes most of the continent of Eurasia (a landmass consisting of the traditional continents of Europe and Asia), with the notable exceptions of the Indian subcontinent, the Arabian subcontinent and ...
, making the Eastern Block unusually active seismically, accounting for six of the ten deadliest earthquakes in recorded history. The Tangshan fault that ruptured 28 July runs right under the center of Tangshan City. One of three faults in the Changdong fault zone, it runs approximately east-northeast (ENE) about 36 km to where it terminates against the north–south trending fault where, just to the south, the secondary M 7.1 quake occurred ("B" on the 'shaking' map). The southern end of the Tangshan fault (it bends slightly at Tangshan) is near Ninghe, which was also the site of a M 6.2 earthquake several hours after the main shock, and an M 6.9 quake ("C") the following November. The Tangshan fault is considered shallow, but corresponds with a deeper and younger fault with somewhat differing characteristics.


Question of prediction

Whether the Tangshan earthquake was predicted has had considerable political as well as seismological significance. The 1975 Haicheng earthquake (about 400 km 50 milesnortheast of Tangshan) is regarded by seismologists as the only successful prediction of a major earthquake, although no mechanism has been proposed to explain this prediction, and no successful predictions have been achieved since. The surprisingly light death toll – initial reports were of "very few people killed", but later determined to be a modest 2,041—for this magnitude 7.5 quake, attributed to the precautionary measures taken following a definite short-term prediction, was proclaimed as a demonstration of the superiority of China's socialist system, and incidentally a validation of the Chinese methodologies. However, it was later determined that the most important factor in anticipating the Haicheng earthquake was the extended series of significant foreshocks ("powerful messages from nature"), and the low casualty rate was due largely to the time of day, hitting in the early evening when most people were neither at work nor asleep.. Tangshan was not so fortunate. Seventeen months later the 242,419 fatalities of the similarly sized Tangshan earthquake was therefore a considerable shock politically as well as seismically. While some of this greater mortality might be attributed to the exposure of a larger population, or the time of day (Haicheng was struck in the early evening, Tangshan while most people were asleep), the principal factor appeared to be the failure to take any precautionary measures: Tangshan was entirely unprepared.. At the time, the Chinese methods of earthquake prediction mainly consisted of watching for various precursors, including foreshocks, and were celebrated for their success at Haicheng and elsewhere. Many seismologists consider the Tangshan earthquakes to have ''not'' been predicted, even "famously unpredicted", and that it was not predictable due to a lack of precursory anomalous phenomena. Furthermore, an investigation 30 years later found that there was no official short-term prediction of an imminent earthquake at Haicheng, and that, though there were many unofficial predictions of an imminent quake, none of those had a scientific basis. The warnings that were made and precautions taken happened largely at the local level, based on general middle-term predictions, enhanced public awareness due to an educational campaign, and a series of foreshocks. It is significant that at Tangshan there were no perceptible foreshocks. On the other hand, it is reported that several people at the State Seismological Bureau (SSB) wanted to warn of an impending earthquake somewhere in the region between Beijing and the Bohai Sea, and that this was discussed at several meetings. One of these was a week-long national conference on earthquake predictions and preparation that convened in Tangshan on 14 July (two weeks before the earthquake) where Wang Chengmin is said to have warned there could be a magnitude 5+ earthquake in the Tangshan—Luanxian area between 22 July and 5 August.. However, in addition to the distractions of the
Cultural Revolution The Cultural Revolution, formally known as the Great Proletarian Cultural Revolution, was a sociopolitical movement in the People's Republic of China (PRC) launched by Mao Zedong in 1966, and lasting until his death in 1976. Its stated goal ...
, there was a possible disagreement within the SSB on whether the next large earthquake would be in eastern China (e.g. the Beijing area) or western China, and that in May it had been concluded that no major earthquakes would occur in the Beijing–Tangshan area.. As it turned out, western China was hit by the magnitude 7.2 Songpan-Pingwu earthquake only three weeks after Tangshan, showing that those arguing for the imminence of an earthquake in Western China were not entirely wrong. At another meeting, on 26 July, there was a purported suggestion to ''not'' issue any warning, to avoid alarming the population. The next morning, at an emergency meeting he requested with the Bureau's leadership, Wang was reportedly told by Deputy Chief Cha Zhiyuan that "We are currently very busy. We will discuss it again next week." However, Cha has disputed this, claiming that Wang said there would be no major earthquakes. Another account says Wang was directed to submit more information, then send a small group to observe the earthquake. Some of the bureaucratic reticence to issue warnings and order precautionary measures likely resulted from too many predictions. These were often based on doubtful theories notorious for false alarms that earthquakes can be predicted on the basis of droughts, daily temperatures, variations in geomagnetism, or isolated anomalous phenomena. They were often too broad (magnitude "of at least 4.0 in the area of Beijing, Tianjin, Huailai, Tangshan, Bohai, and Zhangjiakou", "in a few years") to warrant large-scale societal and economic disruption. Such disruptions could be serious: a false alarm in October, 1976, issued by the
Shaanxi Shaanxi (alternatively Shensi, see #Name, § Name) is a landlocked Provinces of China, province of China. Officially part of Northwest China, it borders the province-level divisions of Shanxi (NE, E), Henan (E), Hubei (SE), Chongqing (S), Sichu ...
provincial government, is estimated to have disrupted the lives of 65% of the population of that province for half a year. It has also been estimated that "in the fall of 1976 about 400 million of the then total population of 930 million of China spent some nights in temporary earthquake shelters." This illustrates the classic dilemma of earthquake prediction: increasing the sensitivity to the possibility of an earthquake (i.e., reducing the failure to predict) increases the number false alarms, which often has a significant cost.


Comparison

Comparison of the Tangshan death toll – officially 242,419—with other earthquake disasters is problematical because of uncertainty in the statistics. For example, the 1556 Shaanxi earthquake (estimated magnitude of ~8) is generally said to have been the deadliest earthquake disaster in history, with 830,000 deaths, based on Chinese historical records. However, a Chinese language source argues for only 530,000 deaths from the earthquake itself, with the larger number being the total reduction of population due to deaths from all causes (including exposure, disease, and famine) as well as people leaving the region due to economic collapse. Another Chinese source states (without citing any sources) that the 1556 earthquake killed only about 100,000 directly, with another 700,000 dying of disease. Depending on what basis is used, the Tangshan disaster can thus be considered as approximately one-third, one-half, or twice as deadly as the Shaanxi disaster. The other five deadliest earthquake disasters known in history, with magnitudes ranging from 7.0 to 9.1, have had death tolls just under that of Tangshan's: * 1138 Aleppo earthquake (Syria) magnitude unknown, ~230,000 deaths. * 2004 Sumatra earthquake (Indonesia) M 9.1, 227,898 deaths, mostly due to tsunamis. * 2010 Haiti earthquake M 7.0, 100,000–316,000 deaths.https://www.cjr.org/behind_the_news/one_year_later_haitian_earthqu.php?page=all ''
Columbia Journalism Review The ''Columbia Journalism Review'' (''CJR'') is a biannual magazine for professional journalists that has been published by the Columbia University Graduate School of Journalism since 1961. Its contents include news and media industry trends, an ...
'', "Two Years Later, Haitian Earthquake Death Toll in Dispute", 20 January 2012
U.S. Geological Survey The United States Geological Survey (USGS), formerly simply known as the Geological Survey, is a scientific agency of the United States government. The scientists of the USGS study the landscape of the United States, its natural resources, and ...
, ''Earthquakes with 50,000 or More Deaths''
* 1920 Haiyuan (Gansu) earthquake (China) M 7.8, 200,000–273,400 deaths. *
856 Damghan earthquake The 856 Damghan earthquake or the 856 Qumis earthquake occurred on 22 December 856 (242 AH). The earthquake had an estimated magnitude of 7.9, and a maximum intensity of X (''Extreme'') on the Mercalli intensity scale. The meizoseismal area (a ...
(Iran) magnitude unknown, ~200,000 deaths. Other notably deadly earthquakes in the past century include: *
1923 Great Kantō earthquake The struck the Kantō Plain on the main Japanese island of Honshū at 11:58:44 JST (02:58:44 UTC) on Saturday, September 1, 1923. Varied accounts indicate the duration of the earthquake was between four and ten minutes. Extensive firestorms an ...
(Japan) M 7.9, 142,800 deaths, mostly due to fire. * 1948 Ashgabat earthquake (Turkmenistan) M 7.3, 110,000 deaths. Although unprepared, compared to other earthquake disasters Tangshan did not experience significant common secondary disasters arising from fire, tsunami, landsliding, or flooding due to blocking of rivers or breaching of dikes. A dam holding back a large reservoir just above Tangshan was seriously damaged but did not fail; similarly for another dam that imperiled Tianjin and some outlying districts of Beijing. The immediate and massive response by the government resulted in the rescue of thousands of people in the first two days (after which mortality increases rapidly), while prompt attention to the problems of clean water, food, and public health avoided the mortality due to epidemic disease and starvation that often follows such disasters.


Cultural references

Chinese director
Feng Xiaogang Feng Xiaogang (; born 18 March 1958 in Beijing) is a Chinese film director, screenwriter, actor, producer and politician. He is well known in China as a highly successful commercial filmmaker whose comedy films do consistently well at the box of ...
's 2010 drama film ''
Aftershock In seismology, an aftershock is a smaller earthquake that follows a larger earthquake, in the same area of the main shock, caused as the displaced crust adjusts to the effects of the main shock. Large earthquakes can have hundreds to thousand ...
'' gives an account of the earthquake and its effects. Footage of the incident appeared in the film ''Days of Fury'' (1979), directed by Fred Warshofsky and hosted by
Vincent Price Vincent Leonard Price Jr. (May 27, 1911 – October 25, 1993) was an American actor, art historian, art collector and gourmet cook. He appeared on stage, television, and radio, and in more than 100 films. Price has two stars on the Hollywood Wal ...
.


See also

*
List of earthquakes in China This is a List of earthquakes in China, part of the series of lists of disasters in China. China has been the location of some of the most deadly earthquakes in history. The deadliest was the 1976 Tangshan earthquake with 300,000+ deaths. Earth ...
*
List of disasters in China by death toll This is a list of disasters in China by death toll. Earthquake A full list in chronological order is detailed in the list of earthquakes in China. Among which, the most fatal ones were: Famine A full list in chronological order is detailed in ...
*
List of earthquakes in 1976 This is a list of earthquakes in 1976. Only earthquakes of magnitude 6 or above are included, unless they result in damage and/or casualties, or are notable for some other reason. All dates are listed according to UTC time. Maximum intensities ...
* Tangshan Earthquake Memorial Park


Notes


Sources

* *. *. *. English translation by JPL of a lecture originally published in 1976 in a special issue of the ''Journal of the Seismological Society of Japan'' (in Japanese). *. *. *. *. English translation by JPL of a lecture originally published in 1976 in a special issue of the ''Journal of the Seismological Society of Japan'' (in Japanese). *. * . *. *. *. * . *. English translation of the Chinese report of 1986. *. * . * * . * . * . * . * . * . * . * . * . * . * . * . * * . * . * . The "American Seismological Delegation". * . * .The Haicheng Earthquake Study Delegation. * . * . * . * . * . * . * . * . * . * . * . * . * . * * . * . * . * . * . * . * . * . * .


Further reading

*
Qian Gang Qian Gang (; born 11 August 1953) is a Chinese non-fiction writer and journalist from Hangzhou in Zhejiang Province, China who over four decades has written hundreds of articles and dozens of books. Life In 1969 Qian joined the People's Liberati ...
. ''The Great China Earthquake''. Beijing:
Foreign Languages Press Foreign Languages Press is a publishing house located in China. Based in Beijing, it was founded in 1952 and currently forms part of the China International Publishing Group, which is owned and controlled by the Publicity Department of the Chi ...
, 1989. . * James Palmer. ''Heaven Cracks, Earth Shakes: The Tangshan Earthquake and the Death of Mao's China''. New York: Basic Books, 2011. (hardcover alk. paper) 9780465023493 (ebk. alk. paper).
Report on The Great Tangshan Earthquake of 1976
English translation of an extensive Chinese report from 1986. *


External links



at GlobalWatch.org * * An isoseismal map (showing the different zones of shaking intensity) of the Tangshan earthquake can be foun
here
{{DEFAULTSORT:1976 Tangshan Earthquake
Tangshan Tangshan () is a coastal, industrial prefecture-level city in the northeast of Hebei province. It is located in the eastern part of Hebei Province and the northeastern part of the North China Plain. It is located in the central area of the Boha ...
Tangshan Earthquake, 1976 1976 Tangshan History of Beijing History of Hebei July 1976 events in Asia Tangshan 1976 disasters in China