The , or Kobe earthquake, occurred on January 17, 1995, at 05:46:53 JST (January 16 at 20:46:53 UTC) in the southern part of Hyōgo Prefecture, Japan, including the region known as
Hanshin
, derived from the second kanji from and the first kanji from (but in ''on''-reading instead of ''kun''-reading), refers generally to Osaka, Kobe, and the surrounding area in the Kansai region of Japan.
In the context of a region of Hyōgo ...
. It measured 6.9 on the
moment magnitude scale
The moment magnitude scale (MMS; denoted explicitly with or Mw, and generally implied with use of a single M for magnitude) is a measure of an earthquake's magnitude ("size" or strength) based on its seismic moment. It was defined in a 1979 pape ...
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 ...
). The tremors lasted for approximately 20 seconds. The
focus
Focus, or its plural form foci may refer to:
Arts
* Focus or Focus Festival, former name of the Adelaide Fringe arts festival in South Australia Film
*''Focus'', a 1962 TV film starring James Whitmore
* ''Focus'' (2001 film), a 2001 film based ...
of the earthquake was located 17 km beneath its
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 ...
, on the northern end of Awaji Island, 20 km away from the center of the city of Kobe.
Approximately 6,434 people died as a result of this earthquake; about 4,600 of them were from Kobe. Among major cities, Kobe, with its population of 1.5 million, was the closest to the epicenter and hit by the strongest tremors. This was Japan's deadliest earthquake in the 20th century after the Great Kantō earthquake in 1923, which claimed more than 105,000 lives.
Earthquake
Most of the largest earthquakes in Japan are caused by subduction of the
Philippine Sea Plate
The Philippine Sea Plate or the Philippine Plate is a tectonic plate comprising oceanic lithosphere that lies beneath the Philippine Sea, to the east of the Philippines. Most segments of the Philippines, including northern Luzon, are part o ...
or Pacific Plate, with mechanisms that involve either energy released within the subducting plate or the accumulation and sudden release of stress in the overlying plate. Earthquakes of these types are especially frequent in the coastal regions of northeastern Japan.
The Great Hanshin earthquake belonged to a third type, called an "inland shallow earthquake". Earthquakes of this type occur along
active fault
An active fault is a fault that is likely to become the source of another earthquake sometime in the future. Geologists commonly consider faults to be active if there has been movement observed or evidence of seismic activity during the last 10,0 ...
s. Even at lower magnitudes, they can be very destructive because they often occur near populated areas and because their hypocenters are located less than 20 km below the surface. The Great Hanshin earthquake began north of the island of Awaji, which lies just south of Kobe. It spread toward the southwest along the
Nojima Fault
is a fault that was responsible for the Great Hanshin earthquake of 1995 (Kobe Quake). It cuts across Awaji Island, Japan and it is a branch of the Japan Median Tectonic Line which runs the length of the southern half of Honshu island. The fa ...
on Awaji and toward the northeast along the Suma and Suwayama faults, which run through the center of Kobe. Observations of deformations in these faults suggest that the area was subjected to east–west compression, which is consistent with previously known crustal movements. Like other earthquakes recorded in western Japan between 1891 and 1948, the 1995 earthquake had a strike-slip mechanism that accommodated east–west shortening of 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 ...
due to its collision with the
Philippine Sea Plate
The Philippine Sea Plate or the Philippine Plate is a tectonic plate comprising oceanic lithosphere that lies beneath the Philippine Sea, to the east of the Philippines. Most segments of the Philippines, including northern Luzon, are part o ...
in central
Honshu
, historically called , is the largest and most populous island of Japan. It is located south of Hokkaidō across the Tsugaru Strait, north of Shikoku across the Inland Sea, and northeast of Kyūshū across the Kanmon Straits. The island se ...
.
The Mj 7.3 earthquake struck at 05:46 JST on the morning of January 17, 1995. It lasted for 20 seconds. During this time the south side of the
Nojima Fault
is a fault that was responsible for the Great Hanshin earthquake of 1995 (Kobe Quake). It cuts across Awaji Island, Japan and it is a branch of the Japan Median Tectonic Line which runs the length of the southern half of Honshu island. The fa ...
moved 1.5 meters to the right and 1.2 meters downwards. There were four
foreshock
A foreshock is an earthquake that occurs before a larger seismic event (the mainshock) and is related to it in both time and space. The designation of an earthquake as ''foreshock'', ''mainshock'' or aftershock is only possible after the full se ...
s, beginning with the largest (Mj 3.7) at 18:28 on the previous day.
Intensity
It was the first time that an earthquake in Japan was officially measured at a seismic intensity (''shindo'' in Japanese) of the highest Level 7 on the scale of
Japan Meteorological Agency
The , abbreviated JMA, is an agency of the Ministry of Land, Infrastructure, Transport and Tourism. It is charged with gathering and providing results for the public in Japan that are obtained from data based on daily scientific observation an ...
(JMA). After the earthquake, seismic intensity observation in Japan was fully mechanized (from April 1996) and JMA seismic intensity Levels 5 and 6 were each divided into 2 levels (from October 1996).
An on-the spot investigation by JMA concluded that tremors by this earthquake were at seismic intensity of Level 7 in particular areas in northern Awaji Island (now Awaji City) and in the cities of Kobe, Ashiya,
Nishinomiya
270px, Nishinomiya City Hall
270px, Aerial view of Nishinomiya city center
270px, Hirota Shrine
is a city located in Hyōgo Prefecture, Japan. , the city had an estimated population of 484,368 in 218948 households and a population density of ...
and Takarazuka.
Tremors were valued at seismic intensity of Levels 4 to 6 at observation points in Kansai, Chūgoku,
Shikoku
is the smallest of the four main islands of Japan. It is long and between wide. It has a population of 3.8 million (, 3.1%). It is south of Honshu and northeast of Kyushu. Shikoku's ancient names include ''Iyo-no-futana-shima'' (), '' ...
and Chūbu regions:Search result on JMA database (in Japanese) of seismic intensity.
Damage
Damage was widespread and severe. Structures irreparably damaged by the quake included nearly 400,000 buildings, numerous elevated road and rail bridges, and 120 of the 150
quay
A wharf, quay (, also ), staith, or staithe is a structure on the shore of a harbour or on the bank of a river or canal where ships may dock to load and unload cargo or passengers. Such a structure includes one or more berths ( mooring locatio ...
s in the port of Kobe. The quake triggered approximately 300 fires, which raged over large portions of the city. Disruptions of water, electricity and gas supplies were common. Residents feared returning home because of aftershocks that lasted several days (74 of which were strong enough to be felt).
The majority of deaths (over 4,000) occurred in cities and suburbs in Hyōgo Prefecture. A total of 68 children under the age of 18 were orphaned, while 332 children lost one parent.
One in five of the buildings in the worst-hit areas were completely destroyed or rendered uninhabitable. About 22% of the offices in Kobe's central business district were rendered unusable, and over half of the houses in that area were deemed unfit for occupancy. Although some were destroyed and others suffered severe damage, high rise buildings that were built after the 1981 building code suffered to a lesser extent. Those that were not constructed to these standards suffered serious structural damage. Most older traditional houses had heavy tiled roofs which weighed around two tons, intended to resist the frequent typhoons plaguing Kobe, but were only supported by a light wooden frame. When these wood supports gave way, the roof would crush the unreinforced walls and floors in a pancake collapse. Newer homes have reinforced walls and lighter roofs to avoid this, but are more susceptible to typhoons.
The damage to highways and subways was the most graphic image of the earthquake, and images of the collapsed elevated
Kobe Route
The , signed as Route 3, is one of the routes of the Hanshin Expressway system serving the Keihanshin area in Kansai, Japan. It is an intercity route that travels in an east to west direction from Osaka to Kobe, with a total length of .
Rou ...
of the
Hanshin Expressway
The is a network of expressways surrounding Osaka, Kobe and Kyoto, Japan. Operated by , it opened in 1962.
Portions of the Hanshin Expressway about east of Fukae Station collapsed during the Kobe earthquake on 17 January 1995. These sectio ...
appeared on front pages of newspapers worldwide. Most people in Japan believed those structures to be relatively safe from earthquake damage because of the steel-reinforced concrete design. Although the initial belief was construction had been negligent, it was later shown that most of the collapsed structures were constructed properly according to the building codes in force in the 1960s. The steel-reinforcement specifications in the 1960s regulations had already been discovered to be inadequate and revised several times, the latest revision being in 1981, which proved effective but only applied to new structures.
Ten spans of the Kobe Route elevated expressway were knocked over in three locations across Kobe and Nishinomiya, blocking a link that carried 40% of Osaka-Kobe road traffic. Half of the elevated expressway's piers sustained some damage. The entire route was not reopened until September 30, 1996. Three bridges on the less heavily used Route 2 were damaged, but the highway was reopened well ahead of Route 3 and served as one of the main intercity road links for a time. The Meishin Expressway was only lightly damaged, but was closed during the day until February 17, 1995, so that emergency vehicles could easily access the hardest-hit areas to the west. It wasn't until July 29 that all four lanes were opened to traffic along one section. Many surface highways were clogged for some time due to the collapse of higher-capacity elevated highways.
Most railways in the region were damaged. In the aftermath of the earthquake, only 30% of the Osaka-Kobe railway tracks were operational. Daikai Station on the
Kobe Rapid Railway
Kobe ( , ; officially , ) is the capital city of Hyōgo Prefecture Japan. With a population around 1.5 million, Kobe is Japan's seventh-largest city and the third-largest port city after Tokyo and Yokohama. It is located in Kansai region, whi ...
line collapsed, bringing down part of National Route 28 above it. Wooden supports collapsed inside supposedly solid concrete pilings under the tracks of the
Shinkansen
The , colloquially known in English as the bullet train, is a network of high-speed railway lines in Japan. Initially, it was built to connect distant Japanese regions with Tokyo, the capital, to aid economic growth and development. Beyond l ...
high-speed rail line, causing the entire line to shut down. The railways rebounded quickly after the quake, reaching 80% operability in one month. The Kobe Municipal Subway resumed operation the day after the earthquake with limited service between and stations (along with the Hokushin Kyuko Electric Railway between and ). Service resumed across the entire line on February 16, 1995, with full service resuming a month later after repairs were completed. Trains continued to operate with speed restrictions until July 21, 1995.
Artificial islands, such as the modern
Rokkō Island
is a man-made island in Higashinada-ku, Kobe, Hyōgo, Japan. It is located in the southeast region of the Port of Kobe. The island has a rectangular shape, and covers . The residential area of the island, featuring apartment buildings—man ...
and especially
Port Island
is an artificial island in Chuo-ku, Kobe, Japan. It was constructed between 1966-1980 (Phase 1) and 1987-2009 (Phase 2) at Port of Kobe, and officially opened with an exposition called " Portopia '81." It now houses a heliport, numerous ho ...
in Kobe, suffered severe subsidence due to liquefaction. Water breaking through the surface and flooding those islands was initially believed to have seeped in from the sea, but in fact rose from the liquefied remains of once-solid soils used to construct the islands. The newly-completed artificial island supporting
Kansai International Airport
Kansai International Airport ( ja, 関西国際空港, Kansai Kokusai Kūkō) commonly known as is the primary international airport in the Greater Osaka Area of Japan and the closest international airport to the cities of Osaka, Kyoto, and ...
was not significantly affected, due to being further from the epicenter, and because it was built to the latest standards. The
Akashi Kaikyō Bridge
The is a suspension bridge which links the city of Kobe on the Japanese island of Honshu to Iwaya on Awaji Island. It is part of the Kobe-Awaji-Naruto Expressway, and crosses the busy and turbulent Akashi Strait (''Akashi Kaikyō'' in Japanese ...
, under construction near the earthquake's epicenter, was undamaged but was reportedly lengthened by a full meter due to horizontal displacement along the activated tectonic fault.
Nomenclature
Outside Japan the earthquake is commonly known as the Kobe earthquake. In Japan, the disaster by this earthquake is officially called , which is often shortened to . ''Hanshin'' refers to the region between Osaka and Kobe. In the scientific literature it is often called the , the name chosen by the
Japan Meteorological Agency
The , abbreviated JMA, is an agency of the Ministry of Land, Infrastructure, Transport and Tourism. It is charged with gathering and providing results for the public in Japan that are obtained from data based on daily scientific observation an ...
in the week after the main shock.
Other aspects
The quake ravaged many of the facilities of what was then the world's sixth-largest container port and the source of nearly 40% of Kobe's industrial output.
The sheer size of the earthquake caused a major decline in Japanese stock markets, with the
Nikkei 225
The Nikkei 225, or , more commonly called the ''Nikkei'' or the ''Nikkei index'' (), is a stock market index for the Tokyo Stock Exchange (TSE). It has been calculated daily by the '' Nihon Keizai Shimbun'' (''The Nikkei'') newspaper since 1950 ...
index plunging by 1,025 points on the day following the quake. This financial damage was the immediate cause for the collapse of
Barings Bank
Barings Bank was a British merchant bank based in London, and one of England's oldest merchant banks after Berenberg Bank, Barings' close collaborator and German representative. It was founded in 1762 by Francis Baring, a British-born member ...
due to the actions of
Nick Leeson
Nicholas William Leeson (born 25 February 1967) is an English former derivatives trader whose fraudulent, unauthorized and speculative trades resulted in the 1995 collapse of Barings Bank, the United Kingdom's oldest merchant bank. Leeson w ...
, who had speculated vast amounts of money on Japanese and Singaporean derivatives. Discussions of Japan's " Lost Decade" tend towards purely economic analysis, and neglect the impact of the earthquake on the Japanese economy which at the time was already suffering from recession.
Despite this devastation in a big production center, the local economy recovered very quickly. Even though less than half the port facilities had been rebuilt by that stage, within a year import volumes through the port had recovered fully and export volumes were nearly back to where they would have been without the disaster. Less than 15 months after the earthquake, in March 1996, manufacturing activity in greater Kobe was at 98% of its projected pre-quake level.
Volunteerism
The fact that volunteers from all over Japan converged on Kobe to help victims of the quake was an important event in the history of volunteerism in Japan. The year 1995 is often regarded as a turning point in the emergence of volunteerism as a major form of civic engagement.
In December 1995, the government declared January 17 a national "Disaster Prevention and Volunteerism Day", and the week from January 15 to 21 a national "Disaster Prevention and Volunteerism Week", to be commemorated with lectures, seminars, and other events designed to encourage voluntary disaster preparedness and relief efforts.
Disaster planning
The earthquake proved to be a major wake-up call for Japanese disaster prevention authorities. Japan installed rubber blocks under bridges to absorb the shock and rebuilt buildings further apart to prevent collateral damage. The national government changed its disaster response policies in the wake of the earthquake, and its response to the
2004 Chūetsu earthquake
The occurred in Niigata Prefecture, Japan, at 17:56 local time (08:56 UTC) on Saturday, October 23, 2004. The Japan Meteorological Agency (JMA) named it the .
was significantly faster and more effective. The Ground Self-Defense Forces were given automatic authority to respond to earthquakes over a certain magnitude, which allowed them to deploy to the Niigata region within minutes. Control over fire response was likewise handed over from local fire departments to a central command base in Tokyo and Kyoto.
In response to the widespread damage to transportation infrastructure, and the resulting effect on emergency response times in the disaster area, the Ministry of Land, Infrastructure and Transport began designating special disaster prevention routes and reinforcing the roads and surrounding buildings so as to keep them as intact as possible in the event of another earthquake. Hyōgo's prefectural government invested millions of yen in the following years to build earthquake-proof shelters and supplies in public parks.
Memorials
The
Kobe Luminarie
is a light festival held in Kobe, Japan, every December since 1995 to commemorate the Great Hanshin earthquake of that year.
Response
Approximately 1.2 million volunteers were involved in relief efforts during the first three months following the earthquake. Retailers such as
Daiei
, based in Kobe, Hyōgo, Kobe, is one of the largest supermarket chains in Japan. In 1957, Isao Nakauchi founded the chain in Osaka near Sembayashi Station on the Keihan train line. Daiei is now under a restructuring process supported by Maruben ...
and 7-Eleven used their existing supply networks to provide necessities in affected areas, while NTT and
Motorola
Motorola, Inc. () was an American multinational telecommunications company based in Schaumburg, Illinois, United States. After having lost $4.3 billion from 2007 to 2009, the company split into two independent public companies, Motorol ...
provided free telephone service for victims.
The organized crime
Yamaguchi-gumi
is Japan's largest '' yakuza'' organization. It is named after its founder Harukichi Yamaguchi. Its origins can be traced back to a loose labor union for dockworkers in Kobe before World War II.
It is one of the largest criminal organizations i ...
''
yakuza
, also known as , are members of transnational organized crime syndicates originating in Japan. The Japanese police and media, by request of the police, call them , while the ''yakuza'' call themselves . The English equivalent for the ter ...
'' syndicate was actively involved in the relief effort from the beginning, distributing substantial amounts of food and supplies to needy victims. Aid provided by the Yamaguchi-gumi was particularly crucial in the immediate aftermath of the earthquake, due to the failure of the Japanese government to organize effective relief to the area initially.
Local hospitals struggled to keep up with demand for medical treatment, largely due to collapsed or obstructed "lifelines" (roads) that kept supplies and personnel from reaching the affected areas. People were forced to wait in corridors due to the overcrowding and lack of space. Some people had to be operated on in waiting rooms and corridors.
To help speed the recovery effort, the government closed most of the Hanshin Expressway network to private vehicles from 6:00 am to 8:00 pm daily and limited traffic to buses, taxis and other designated vehicles. To keep the light rail system running even though it had quite severely damaged sections, shuttle buses were commissioned to transfer patrons to stations around damaged sections.
See also
*
List of disasters in Japan by death toll
This is a list of Japanese disasters by their death toll. Included in the list are disasters both natural and man-made, but it excludes acts of war and epidemics. The disasters occurred in Japan and its territories or involved a significant number ...
List of earthquakes in Japan
This is a list of earthquakes in Japan with either a magnitude greater than or equal to 7.0 or which caused significant damage or casualties. As indicated below, magnitude is measured on the Richter magnitude scale (''ML'') or the moment magnitud ...
*
Natural disasters in Japan
Japan is the country that is most affected by natural disasters mainly due to it being in the Ring of Fire. Two out of the five most expensive natural disasters in recent history have occurred in Japan, in 1995 and 2011, costing $181 billion. Jap ...
Headquarters for Earthquake Research Promotion
The is an extraordinary organ of the Japanese Ministry of Education, Culture, Sports, Science and Technology. It was established in 1995, as a response to the damages caused by the Great Hanshin earthquake, to promote research on earthquakes i ...
Kobe University
, also known in the Kansai region as , is a leading Japanese national university located in the city of Kobe, in Hyōgo. It was established in 1949, but the academic origins of Kobe University trace back to the establishment of Kobe Higher Comme ...