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MOUNT PINATUBO (Sambali : Bakil nin Pinatubu; Kapampangan :
Bunduk/Bulkan ning Pinatubu, Bunduk ning Apu Malyari; Pangasinan :
Palandey/Bulkan na Pinatubu; Ilocano : Bantay Pinatubo; Tagalog :
Bundok/Bulkang Pinatubo) is an active stratovolcanic caldera in the
Zambales Mountains , located on the tripoint boundary of the
Philippine provinces of
Pampanga , all in
Ultra Plinian eruption on June 15, 1991 produced the
second-largest terrestrial eruption of the 20th century after the 1912
The effects of the eruption were felt worldwide. It ejected roughly
10,000,000,000 tonnes (1.1×1010 short tons ) or 10 km3 (2.4 cu mi) of
magma, and 20,000,000 tonnes (22,000,000 short tons) of SO
2, bringing vast quantities of minerals and toxic metals to the
surface environment. It injected more particulate into the
stratosphere than any eruption since
* 1 Overview of the area
* 2 History
* 2.1 Ancestral Pinatubo
* 2.2 Modern Pinatubo
* 2.2.1 Possible precursor in 1990 * 2.2.2 1991 activities leading to the eruption * 2.2.3 Evacuations
* 2.3 1991 eruption
* 2.3.1 Climactic eruption buildup * 2.3.2 The climactic eruption * 2.3.3 The eruption effects on aircraft
* 2.4 Aftermath of the 1991 eruption
* 2.4.1 Explosivity of the eruption * 2.4.2 Death toll * 2.4.3 Effects on agriculture * 2.4.4 Local economic and social effects * 2.4.5 Lahars * 2.4.6 Military impact * 2.4.7 Global environmental effects * 2.4.8 Impact on the indigenous people of Pinatubo * 2.4.9 Aftermath of the eruptions in pictures
* 3 Humanitarian Aid
* 3.1 Local
* 3.1.1 Government
* 3.1.2 Asian Disaster Reduction Center
* 126.96.36.199 Resettlement
* 188.8.131.52 Livelihood
* 184.108.40.206 Social Services
* 3.2 International
* 3.2.1 United Nations * 3.2.2 Others
* 4 Activity since 1991
* 4.1 Lake Pinatubo * 4.2 Recent activity
* 5 Cultural history
* 5.1 History among Aetas
* 6 Aetas granted ownership of Pinatubo * 7 Pinatubo in popular culture * 8 Hiking Pinatubo * 9 See also * 10 Notes * 11 References * 12 External links
OVERVIEW OF THE AREA
The location of
The volcano is 87 km (54 mi) northwest of
Mount Pinatubo's summit before the 1991 eruption was 1,745 m (5,725
ft) above sea level, only about 600 m (2,000 ft) above nearby plains ,
and only about 200 m (660 ft) higher than surrounding peaks, which
largely obscured it from view. It is part of a chain of volcanoes
which lie along the western side of the island of
Pinatubo belongs to the Cabusilan sub-range of the
, which consists of Mt. Cuadrado, Mt. Negron, Mt. Mataba and Mt.
Pinatubo. They are subduction volcanoes, formed by the Eurasian Plate
sliding under the
Philippine Mobile Belt along the
Pinatubo is flanked on the west by the
which is an easterly-dipping section of
The most recent study of
Pinatubo in April 1991, a few months before the eruption.
Activity of Ancestral Pinatubo seems to have begun about 1.1 million years ago and probably ended tens of thousands of years or more before the birth of "modern" Pinatubo. Much of the rugged land around the present volcano consists of remnants of "ancestral" Pinatubo. It was an andesite and dacite stratovolcano whose eruptive activity was much less explosive than modern Pinatubo. Its center was roughly where the current volcano is. The projected height of the mountain is up to 2,300 m (7,500 ft), 1.43 miles above sea level if it were a lone peak, based on a profile fitting to the remaining lower slopes, or lower if it had more than one peak.
The old volcano is exposed in the walls of an old 3.5 km × 4.5 km
(2.2 mi × 2.8 mi) wide caldera , referred to as Tayawan
* c. 33,000 BC: After a long period of dormancy , Modern Pinatubo was born in Ancestral Pinatubo's cataclysmic and most explosive eruptions, estimated to be five times larger than the June 1991 eruption. It deposited all around the volcano up to 25 km3 (6.0 cu mi) of pyroclastic surge material up to 100 metres (330 ft) thick. The total volume of volcanic material ejected during the eruptions is unknown. The removal of so much material from the underlying magma chamber resulted in the Tayawan caldera . The violent eruptive period started by the eruption is referred to by Delfin as the Inararo Eruptive Period, named after a village that was destroyed in the 1991 eruption.
Later eruptions of modern Pinatubo occurred episodically and lasted for periods much shorter than the repose intervals between them. Subsequent eruptions and eruptive period occurred about:
* c. 15,000 BC (Sacobia Eruptive Period)
* c. 7000 BC (Pasbul Eruptive Period). Its eruptions were as
energetic, if not as voluminous as the Inararo eruptions.
* c. 4000–3000 BC (Crow
Each of these eruptions seems to have been very large, ejecting more than 10 km³ of material and covering large parts of the surrounding areas with pyroclastic flow deposits. Some eruptive periods have lasted decades and perhaps as much as several centuries and might appear to include multiple large explosive eruptions.
The maximum size of eruptions in each eruptive period though has been getting smaller through the more than 35,000-year history of modern Pinatubo, but this might be an artifact of erosion and burial of older deposits. The oldest eruption of modern Pinatubo, Inararo, was also its largest.
The 1991 eruption was among the smallest documented in its geologic record.
The volcano has never grown very large between eruptions, because it produces mostly unwelded, easily erodible deposits and periodically destroys the viscous domes that fill its vents. After the Buag eruption (c. 1500 AD), the volcano lay dormant, its slopes becoming completely covered in dense rainforest and eroded into gullies and ravines. The c. 500-year repose though between the Buag and present eruptive periods is among the shorter repose periods recognized in its geologic history.
Possible Precursor In 1990
On July 16, 1990, the major 1990
It also followed the Philippine Fault System west as far as Baguio City , which was devastated, and is located about 80 kilometres (50 mi) north-northeast of Pinatubo, leading volcanologists to speculate that it might ultimately have triggered the 1991 eruption, although this is impossible to prove conclusively. Two weeks after the earthquake, local residents reported steam coming from the volcano, but scientists who visited there in response found only small rockslides rather than any pre-eruptive activity.
1991 Activities Leading To The Eruption
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On March 15, 1991, a succession of earthquakes was felt by villagers on the northwestern side of the volcano. Further earthquakes of increasing intensity were felt over the next two weeks, and it became clear some kind of volcanic activity was likely. On April 2, the volcano awoke, with phreatic eruptions occurring near the summit along a 1.5 km (0.93 mi) long fissure . Over the next few weeks, small eruptions continued, dusting the surrounding areas with volcanic ash . Seismographs recorded hundreds of small earthquakes every day.
Scientists immediately installed monitoring equipment and analyzed the volcano for clues as to its previous eruptive history. Radiocarbon dating of charcoal found in old volcanic deposits revealed the last three major explosive eruption periods in recent millennia , about 5500, 3500 and 500 years ago. Geological mapping showed that much of the surrounding plains were formed by lahar flood deposits from previous eruptions.
Volcanic activity increased throughout May. Measurements of sulfur dioxide emissions showed a rapid increase from 500 t (550 short tons) per day by May 13 to 5,000 t (5,500 short tons) per day by May 28. This implied that there was a rising column of fresh magma beneath the volcano. After May 28, the amount of SO 2 being emitted decreased substantially, raising fears that the degassing of the magma had been blocked somehow, leading to a pressure build-up in the magma chamber and a high likelihood of violent explosive eruptions.
The first magmatic eruptions occurred on June 3, and the first large blast on June 7 generated ash columns 7 km (4.3 mi) high. The Philippine Institute of Volcanology and Seismology (PHIVOLCS) immediately issued a warning indicating the possibility of a major eruption within two weeks.
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A map of Mt Pinatubo showing nearby peaks and the evacuation zones.
Given all the signs that a very large eruption was imminent, PHIVOLCS – assisted by the U.S. Geological Survey (USGS) – worked to convince local inhabitants of the high severity of the threat. A false warning might have led to cynicism about any later warnings, but delaying a warning until an eruption began might lead to thousands of deaths, so the volcanologists were under some pressure to deliver a timely and accurate assessment of the volcanic risk.
Three successive evacuation zones were defined, the innermost containing everything within 10 kilometers of the volcano's summit, the second extending 10–20 kilometers from the summit, and the third extending from 20–40 km (12–25 mi) from the summit (Clark Air Base and Angeles City were in this zone). The 10 km (6.2 mi) and 10–20 km (6.2–12.4 mi) zones had a total population of about 40,000 inhabitants, while some more 331,000 inhabitants lived in the 20–40 km (12–25 mi) zone.
Five stages of volcanic alert were defined, from level 1 (low level seismic disturbances) up to level 5 (major eruption in progress). Daily alerts were issued stating the alert level and associated danger area, and the information was announced in major regional and national newspapers , on radio and television stations, by nongovernmental organizations (NGOs) and directly to the endangered inhabitants.
Many of the Aetas who lived on the slopes of the volcano left their villages of their own volition when the first blasts began in April, gathering in a village about 12 kilometres (7.5 mi) from the summit. They moved to increasingly distant settlements as the eruptions escalated, some Aetas moving up to nine times in the two months before the colossal eruption.
The first formal evacuations were ordered for the 10 km (6.2 mi) zone
on April 7. Evacuation of the 10–20 km (6.2–12.4 mi) zone was
ordered when a level 4 alert was issued on June 7. A level 5 alert
triggered evacuation of the 20–40 km (12–25 mi) zone on June 13,
and in all some 60,000 people had left the area within 30 kilometres
(19 mi) of the volcano before June 15. Most people temporarily
relocated to Metro
1991 MOUNT PINATUBO ERUPTION
The eruption cloud shortly before the colossal climactic eruption.
DATE June 15, 1991
* About 20,000 people evacuated * Approximately 800 people were killed and 10,000 people left homeless * Huge destruction left in surrounding areas * Release of 17 megatons of sulfur dioxide into the atmosphere, causing global cooling by 0.5 °C (0.9 °F) between 1991–1993
The second-largest volcanic eruption of the 20th century, and by far
the largest eruption to affect a densely populated area, occurred at
Climactic Eruption Buildup
In early June, tiltmeter measurements had shown that the volcano was gradually inflating, evidently due to fast-growing amounts of magma filling the reservoir beneath the summit. At the same time, seismic activity, previously concentrated at a depth of a few kilometres below a point about 5 kilometres (3.1 mi) northwest of the summit, shifted to shallow depths just below the summit.
On June 7, the first magmatic eruptions took place with the formation of a lava dome at the summit of the volcano. The dome grew substantially over the next five days, reaching a maximum diameter of about 200 m (660 ft) and a height of 40 m (130 ft).
Timely forecasts of an eruption by scientists from the Philippine
A small blast at 03:41 PST on June 12 marked the beginning of a new, more violent phase of the eruption.
A few hours later the same day, massive blasts lasting about half an hour generated big eruption columns , which quickly reached heights of over 19 kilometres (12 mi) and which generated large pyroclastic surges extending up to 4 km (2.5 mi) from the summit in some river valleys . Fourteen hours later, a 15-minute blast hurled volcanic matter to heights of 24 km (15 mi). Friction in the up-rushing ash column generated abundant lightning .
A third large eruption began at 08:41 on June 13, after an intense swarm of small earthquakes over the previous two hours. It lasted about five minutes, and the eruption column once again reached 24 kilometres. After three hours of quiet, seismic activity began, growing more and more intense over the next 24 hours, until a three-minute eruptive blast generated a 21 km (13 mi) high eruption column at 13:09 on June 14.
Tephra fall from these four large eruptions was extensive to the southwest of the volcano. Two hours after the last of these four explosions, a series of eruptions began which lasted for the next 24 hours, and which saw the production of much larger pyroclastic flows and surges which travelled several kilometres down river valleys on the flanks of the volcano.
The Climactic Eruption
On June 15, 1991, the eruption plume minutes after the climactic eruption.
The final massive eruption of
All the seismographs close to Clark Air Base had been rendered completely inoperative by 14:30, mostly by super-massive pyroclastic surges . Intense atmospheric pressure variation was also recorded.
On the same day,
The volcanic column from the crater covered an area of some 125,000
km2 (48,000 sq mi), bringing total darkness to much of Central Luzon.
Almost all of the island received some wet ash fall, which formed a
heavy, rain-saturated snow-like blanket.
Tephra fell over most of the
South China Sea
Twelve days after the first magmatic eruptions of June 3, on June 15, 1991, by about 22:30, and about nine hours after the onset of the most recent climactic phase, atmospheric pressure waves had decreased to the pre-eruption levels. No seismic records were available at this time, but volcanologists believe 22:30 PST marked the end of the climactic eruption.
Vast quantities of minerals and metals were brought to the surface. Overall, introduced to the surface environment was an estimated 800,000 t (880,000 short tons) of zinc , 600,000 t (660,000 short tons) of copper , 550,000 t (610,000 short tons) of chromium , 300,000 t (330,000 short tons) of nickel , and massive amounts of toxic heavy metals such as 100,000 t (110,000 short tons) of lead , 10,000 t (11,000 short tons) of arsenic , 1,000 t (1,100 short tons) of cadmium , and 800 t (880 short tons) of mercury .
The Eruption Effects On Aircraft
At least 16 commercial aircraft made damaging in-flight encounters with the ash cloud ejected by the June 15 eruption, as did other aircraft on the ground. The encounters caused loss of power to one engine on each of two aircraft. 10 engines were damaged and replaced, including all three engines of one DC-10 . Longer term damage to aircraft and engines was reported, including accumulation of sulphate deposits on engines. The eruption also irreparably damaged the Philippine Air Force 's recently retired fleet of Vought F-8s , as these were in open storage at Basa Air Base at the time.
AFTERMATH OF THE 1991 ERUPTION
The summit caldera as seen on Aug. 1, 1991.
Explosivity Of The Eruption
The June 15 eruption had a volcanic explosivity index (VEI) of 6, and
came some 450–500 years after the volcano's last known eruptive
activity. The eruption ejected about 10 km3 (2.4 cu mi) of material,
making it the largest eruption since that of
The former summit of the volcano was obliterated and replaced by a caldera 2.5 km (1.6 mi) wide. The highest point on the caldera rim now stood 1,485 m (4,872 ft) above sea level, some 260 m (850 ft) lower than the pre-eruption summit.
A reported 847 people were killed by the eruption, mostly by roofs
collapsing under the severe weight of accumulated volcanic matter, a
hazard amplified by the simultaneous arrival of
Effects On Agriculture
Many reforestation projects were destroyed in the eruption, with a
total area of 150 km2 (37,000 acres ) valued at 125 million pesos
Many farmers near Pinatubo began growing crops such as peanuts,
cassava and sweet potatoes, which are quick-ripening and could be
harvested before the threat of lahar floods during the late summer
rainy season. A
Local Economic And Social Effects
In total, 364 communities and 2.1 million people were affected by the
eruption, with livelihoods and houses being damaged and destroyed.
More than 8,000 houses were completely destroyed, and a further 73,000
were damaged. In addition to the severe damage sustained by these
communities, roads and communications were damaged or destroyed by
pyroclastic surges and lahar floods throughout the areas surrounding
the volcano. Total losses in 1991 and 1992 alone were estimated at
10.6 and 1.2 billion pesos respectively, including damage to public
infrastructure estimated at 3.8 billion pesos (c. US$92,000,000).
The eruption of Pinatubo severely hampered the economic development of the surrounding areas. The gross regional domestic product of the Pinatubo area accounted for about 10% of the total Philippine gross domestic product . The GRDP had been growing at 5% annually before the eruption, but fell by more than 3% from 1990 to 1991. In 1991, damage to crops and property was estimated at $374 million, to which continuing lahar floods added a further $69 million in 1992. 42 percent of the cropland around the volcano was affected by more lahar floods, dealing a severe blow to the agricultural economy in the region.
Before and after the eruption: a river valley filled in by pyroclastic flow deposits.
Since the eruption, each heavy rain has brought massive lahars from the volcano, displacing thousands of people and inflicting extensive damage to buildings and infrastructure costing billions to repair. A large supply of funds were spent in constructing dikes and dams to control the post-eruption lahar flows.
Several important river systems stem from Mount Pinatubo, the major rivers being the Abacan, Tarlac, Pasig-Potrero, Sta. Lucia, Bucao, Santo Tomas, Maloma, Tanguay, Ashley and Kileng rivers. Before the eruption, these river systems were important ecosystems , but the eruption filled many valleys with deep pyroclastic deposits. Since 1991, the rivers have been clogged with sediment , and the valleys have seen frequent lahars which continued for years after the eruption. Studies show that the river systems will take decades to recover from the June 1991 eruption.
On September 3, 1995, a lahar buried San Guillermo Parish Church to half its 12-meter height.
Global Environmental Effects
The powerful eruption of such an enormous volume of lava and ash
injected significant quantities of aerosols and dust into the
Sulfur dioxide oxidized in the atmosphere to produce a
haze of sulfuric acid droplets, which gradually spread throughout the
stratosphere over the year following the eruption. The injection of
aerosols into the stratosphere is thought to have been the largest
since the eruption of
This very large stratospheric injection resulted in a reduction in the normal amount of sunlight reaching the Earth's surface by roughly 10% (see figure ). This led to a decrease in northern hemisphere average temperatures of 0.5–0.6 °C (0.9–1.1 °F) and a global fall of about 0.4 °C (0.7 °F). At the same time, the temperature in the stratosphere rose to several degrees higher than normal, due to absorption of radiation by the aerosol. The stratospheric cloud from the eruption persisted in the atmosphere for three years after the eruption. While not directly responsible, the eruption may have played a part in the formation of the 1993 Storm of the Century .
The eruption had a significant effect on ozone levels in the
atmosphere, causing a large increase in the destruction rate of ozone.
Impact On The Indigenous People Of Pinatubo
Aeta people were the hardest hit by the eruption. After the areas
surrounding the volcano were declared safe, many Aetas returned to
their old villages only to find them destroyed by pyroclastic and
lahar deposits. Some were able to return to their former way of life,
but most moved instead to government-organized resettlement areas.
Conditions on these were poor, with each family receiving only small
plots of land not ideal for growing crops. Many
Aftermath Of The Eruptions In Pictures
Explosive eruption, late June 1991 *
Snow-like ashfall caused by heavy rain mixing with ash columns *
Erosional dissection of ash deposits on Pinatubo *
Aircraft hangars at Clark Air Base destroyed by ashfall *
Lahars from Pinatubo volcano fill the broad Santo Tomás River valley SW of the volcano *
Humanitarian aid received due to the eruption are as follows:
All in all, the government implemented several rehabilitative and reconstructive programs. Projects that will help deal with the aftermath brought about by lahar were also implemented. Among these is the construction of mega dikes. Moreover, to hasten the implementation of the basic services for the afflicted, private sectors, including the NGOs, took part in offering relief. They provided support and coordinated on the services the was deemed lacking from the side of the government.
FOR WHOM AMOUNT (IN PESOS)
Highlanders (Aetas ) 349 Million
Lowlanders 1.689 Billion
2. LIVELIHOOD PROGRAMS FOCUSED ON AGRICULTURE AND INDUSTRY (QUICK-GENERATING INCOME OPPORTUNITIES TO AFFECTED FAMILIES)
PROGRAM AMOUNT (IN PESOS)
Bamboo Development Project 80 Million
Agricultural Rehabilitation Program 197.4 million
Agricultural Development Program 615 million
Productivity Centers 1.12 Billion
Integrated Cattle Fattening Program 120 million
Integrated Poultry Livelihood Program 40 million
Deep Sea Fishing 58 million
Financing Programs 3.718 billion
3. BASIC SOCIAL SERVICES
PROGRAM AMOUNT (IN PESOS)
Relief Services 370.5 million
Health and Nutrition Service 367 million
Agricultural Development Program 615 million
4. INFRASTRUCTURE REHABILITATION AND RECONSTRUCTION
PROGRAM AMOUNT (IN PESOS)
River Systems Rehabilitation and Improvement Project 2.9 billion
Reconstruction and Rehabilitation of Roads and Bridges 1.5 billion
Development of Alternate Routes in Capas-Botolan Road 537 million
San Fernando Dinalupihan Road 1.4 billion
Angeles-Porac-Floridablanca Dinalupihan Road 169 million
Rehabilitation of Damaged Schools and Public Buildings 982 million
Mobile Health Facilities 40 million
Repair and Rehabilitation of Damaged National and Communal Irrigation Systems 228.6 million
Rehabilitation of Railway Facilities 70 million
Asian Disaster Reduction Center
Disaster Reduction Center was founded in Kobe, Hyogo
prefecture, in 1998, with a mission to improve disaster resilience of
its 50 member countries, to build safe communities, and to create a
society where there is an achievable sustainable development. The
Center works to build and to establish networks among countries
through many programs such as personnel exchanges in this field. The
Center addresses this issue from a global perspective in cooperation
with various UN agencies and international organizations including the
International Strategy for
Disaster Reduction (ISDR), the Office for
the Coodination of Humanitarian Affairs (OCHA), the United Nations
Educational, Scientific and Cultural Organization (UNESCO), the United
Nations Economic and Social Commission for Asia and the Pacific
World Meteorological Organization
After the eruption, a lot of the homes were destroyed and many of the areas affected by lahar were deemed uninhabitable. There was need to resettle the people particularly the Aetas and lowlanders. Resettlement for these two need to take into consideration the factors of their socio-cultural and socio-economic differences.
Faced with the destruction of many of the farmlands and the displacement of farmers and other workers the government had to search for a long term solution to address the issue. Agricultural based industries were also greatly affected. Closure of Clark Air base also raised an issue of finding short term livelihoods and the need to use the base lands to cushion the repercussions of the worker’s displacement.
The destruction brought about by the incident pressured social service sectors to continue their efforts in providing assistance in terms of health, social welfare and education. The services offered are not limited to the victims within the evacuation centers but also offered to the others affected. While the event happened during the opening of a school year, classes were needed to be push back as school facilities were destroyed. Providing resettlement for the evacuees was also a major concern. Social services was also provided in the prospective resettlement areas to prepare the victims when settling down.
Destruction of many infrastructures was mostly due to the wet ash after the explosion. The region’s roads, bridges, public buildings, facilities, communication and structures for river and flood control were some of the great concerns of the government. A need to establish measures for the flash floods and the threat caused by lahar also became an imperative demand to the government.
Land Use And Environmental Management
The aftereffects of the eruption damaged not only manmade structures but also farmlands, forestlands and watershed. River systems and overall environment of the affected region are also heavily damaged by the heavy lahar flow. To address this careful replanning of the land area region is necessary.
Science And Technology
This event showed the need to engage in scientific studies to reassess the current policies and knowledge on areas with risk of eruption. Studies should also be allocated on possible application for the ash fall for industrial and commercial purposes. The significance of this concern affects both the government and private sectors.
Even before the Philippine government officially appealed for international assistance, the Office of U.S. Foreign Disaster Assistance (USAID/OFDA) shipped shelter material for victims of the floods and lahars in late July 1992. In the following month, they provided $375 000 to be used for relief and rehabilitation projects. The Department of Social Welfare and Development had claimed during an informal donors’ meeting with representatives from mostly international agencies who compose the donor community that the national government was still well-equipped and had sufficient resources to aid the victims. The UN- Disaster Management Team (DMT) and the United Nations’ Department of Humanitarian Affairs/United Nations Disaster Relief Organization (DHA/UNDRO) continued cooperating with the national government to monitor the situation and formulate ideas for further assistance.
It was not until the then-President Fidel V. Ramos had declared the affected provinces and areas to be in a state of emergency that the national government officially requested for international assistance and for aid in projects for rehabilitation and relief provisions in the aforementioned areas. In response to this, the DHA/UNDRO reached out to the international community to respond to the appeal, and continued their operations, coordinating with the government.
Among the countries that extended humanitarian relief assistance are
Contributions made by the different systems of the United Nations (UN) are as follows:
UN SYSTEM TYPE OF CONTRIBUTION AMOUNT (IN USD)
United Nations Development Program (UNDP) Cash for local purpose 50,000
United Nations International Children's Emergency Fund (UNICEF) Cash from regular programme funds
Cash from general resources 72,000
World Health Organisation (WHO) One (1) emergency health kit 10,000
World Food Programme (WFP) Food items 50,000
Contributions made by participating countries in the UN are as follows:
COUNTRY TYPE OF CONTRIBUTION AMOUNT (IN USD)
Australia Food, relief goods, medicines, and medicinal supplies
Cash (AUD 250,000) through Department of Social Welfare and Development (DSWD) 7,142
Denmark Cash (DK 250,000) 45,872
Germany Cash (DM 100,000) through non-government organization (NGO)
Cash (DM 100,000) through German Embassy) 70,922
Netherlands Cash through UNICEF 675,000
Spain 40 tents, 100 kits of kitchen utensils (including air transport) 54,644
Sweden Cash (SEK 500,000) through non-government organization 97,087
United Kingdom Cash through SCF/Philippine Business for Social Progress (NGO) 89,108
United States Cash
1,000 boxes plastic sheeting (including air transport)
Cash through Philippine Business for Social Progress
Cash through Jamie Ongpin Foundation
Cash through A. Soriano Foundation 25,000
Some specific projects under the auspices of the DPWH, which were made possible by foreign assistance, included:
・ ADB-funded Mt. Pinatubo Damage Rehabilitation Project
・ German Bank for Reconstruction-funded Mt. Pinatubo Emergency Aide Project
・ Dutch-funded dredging of the Pasac- Guagua-San Fernando Waterway
・ Overseas Economic Cooperation Fund (OECF)-funded Pinatubo Hazard Urgent Mitigation Project
・ German Centrum for International Migration (CIM)-funded Technical
・ JICA-funded Grant Aid for Water Supply in Mt. Pinatubo
Resettlement Areas and Study on
・ IBRD-funded Technical Assistance for Mt. Pinatubo and Rehabilitation Works
・ Swiss Disaster Relief-funded Technical Assistance for Mt. Pinatubo Rehabilitation
・ JBIC Yen Loan Package-funded Pinatubo hazard Urgent Mitigation Project
ACTIVITY SINCE 1991
Following the climactic eruption of June 15, 1991, activity at the volcano continued at a much lower level, with continuous ash eruptions lasting until August 1991 and episodic eruptions continuing for another month. Activity then remained low until July 1992 when a new lava dome started growing in the caldera . Volcanologists suspected that further violent eruptions could be possible, and some areas were evacuated. However, the eruption was only minor, and since that episode, the volcano has been quiet.
The 1991 caldera afterwards filled with water from annual monsoon rains and a crater lake , Lake Pinatubo , was formed. In 1992, a growing lava dome formed an island, which was eventually submerged by the lake. Initially, the lake was hot and highly acidic , with a minimum pH of 2 and a temperature of about 40 °C (104 °F). Subsequent rainfall cooled and diluted the lake, lowering the temperature to 26 °C (79 °F) and raising the pH to 5.5 by 2003.
The lake deepened by about 1 m (3.3 ft) per month on average,
eventually submerging the lava dome, until September 2001, when fears
that the walls of the crater might be unstable prompted the Philippine
government to order a controlled draining of the lake. An estimated
9,000 people were once again evacuated from surrounding areas in case
a large flood was accidentally triggered. Workers cut a 5 m (16 ft)
notch in the crater rim and drained about a quarter of the lake's
volume. The crater of
On July 10, 2002, the west wall of the crater collapsed, slowly releasing approximately 160 million cubic meters of water and sediments into the Maraunot River in Botolan, Zambales .
On July 26, 2011, a 5.9 magnitude earthquake struck close to Pinatubo; however, no major damages or casualties were reported.
The word pinatubo could mean "fertile place where one can make crops grow", or could mean "made to grow", in Sambal and Tagalog , which may suggest a knowledge of its previous eruption in about 1500 AD. There is a local oral tradition suggestive of a folk memory of earlier large eruptions. An ancient legend tells of Bacobaco, a terrible spirit of the sea, who could metamorphose into a huge turtle and throw fire from his mouth. In the legend, when being chased by the spirit hunters, Bacobaco flees to the mountain and digs a great hole in its summit showering the surrounding land with rock, mud, dust and fire for three days; howling so loudly that the earth shakes.
HISTORY AMONG AETAS
It was said to comprise the whole mountain range until Sinukuan of Mount Arayat (the god of the Kapampangans) became a strong rival of Namalyari. Their fight, which took place over the center plains, shattered the mountain into smaller bodies and Mount Arayat lost its center peak. Other versions have it that Pinatubo's peak shattered because of Namalyari's immense fury in an attempt to teach humans the meaning of fear and show how misdeeds will be punished.
According to the native elders, Apo Namalyari induced the June 1991 eruption because of displeasure toward illegal loggers and Philippine National Oil Company executives who performed deep exploratory drilling and well testing on the volcano looking for geothermal heat from 1988 to 1990. Discouraging results from the wells forced the abandonment of the prospect 13 months before the April 2, 1991 explosions.
AETAS GRANTED OWNERSHIP OF PINATUBO
After being driven away by the 1991 eruption of Mount Pinatubo, in
May 2009 some 454
On January 14, 2010, some 7,000
Having the land title will protect them from others — including
foreigners — exploiting their land without compensation and consent
to the indigenous tribes. In the past, the Aetas had to contend with
mining companies, loggers, and recently, tourist companies who earn
Ancestral domain titles are awarded to a certain community or indigenous group who have occupied or possessed the land continuously in accordance with their customs and traditions since time immemorial. They have the legal right to collectively possess and to enjoy the land and its natural resources to the exclusion of others.
PINATUBO IN POPULAR CULTURE
Hiking to Mount Pinatubo's Crater 4x4 Ride to the Hiking Spot
Mt. Pinatubo became famous for its cataclysmic eruption,
List of active volcanoes in the Philippines
* List of inactive volcanoes in the
* ^ A B Pinatubo,
Global Volcanism Program .
* ^ "Pinatubo Volcano". The Philippine Institute of
* ^ "Filipinos return as volcano lake drains". BBC News. September
* ^ Timelines Page @ glassiris.info
* ^ Gonzaga, Robert and Orejas, Tonette (2011-07-26).
"5.9-magnitude quake jolts households in Luzon, Metro areas". Inquirer
* ^ Rodolfo, K.S. & Umbal, J.V. (2008) "A prehistoric lahar-dammed
lake and eruption of
* Chakraborty P, et al. (2009). "Volcanic mesocyclones" (PDF).
Nature. 458: 495–500.
Bibcode :2009Natur.458..497C. PMID 19325632 .
doi :10.1038/nature07866 .
* Decker, R. and Decker, B. (1997) Volcanoes, 3rd edition, WH
Freeman, New York.
* McCormick, M. Patrick; et al. (1995). "Atmospheric effects of the
Mt Pinatubo eruption". Nature . 373 (6513): 399–404. Bibcode
:1995Natur.373..399M. doi :10.1038/373399a0 .
* Rantucci, Giovanni (1994). Geological Disasters In The
Philippines: The July 1990 Earthquake And The June 1991 Eruption of
Mount Pinatubo. Description, effects and lessons learned. Philippine
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