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REMEMBERING THE HISTORIC ERUPTION OF MOUNT PINATUBO, THE PHILIPPINES JUNE 12, 1991. THE SECOND LARGEST ERUPTION OF THE 20 TH CENTURY. Walter Hays, Global Alliance for Disaster Reduction, University of North Carolina, USA. MOUNT PINATUBO: QUIET FOR 450-500 YEARS BEFORE ERUPTING. - PowerPoint PPT Presentation
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REMEMBERING THE HISTORIC ERUPTION OF MOUNT PINATUBO, THE
PHILIPPINES JUNE 12, 1991
THE SECOND LARGEST ERUPTION OF THE 20TH CENTURY
Walter Hays, Global Alliance for Disaster Reduction, University of
North Carolina, USA
MOUNT PINATUBO: QUIET FOR 450-500 YEARS BEFORE ERUPTING
VOLCANO HAZARDS (AKA POTENTIAL DISASTER AGENTS)
• VERTICAL PLUME
• LAVA FLOWS
• LATERAL BLASTS
• LAHARS
• EARTHQUAKES (related to movement of lava)
NATURAL HAZARDS FOR WHICH NATURAL HAZARDS FOR WHICH EVACUATION IS TYPICALEVACUATION IS TYPICAL
NATURAL HAZARDS FOR WHICH NATURAL HAZARDS FOR WHICH EVACUATION IS TYPICALEVACUATION IS TYPICAL
FLOODS
HURRICANES
TYPHOONS
TSUNAMIS
VOLCANIC ERUPTIONS
WILDFIRES
HIGH BENEFIT/COST FOR SAVING LIVES, BUT LOW BEMEFIT/COST FOR PROTECTING PROPERTY
HIGH BENEFIT/COST FOR SAVING LIVES, BUT LOW BEMEFIT/COST FOR PROTECTING PROPERTY
GOAL: MOVE PEOPLE OUT GOAL: MOVE PEOPLE OUT OF HARM’S WAYOF HARM’S WAY
GOAL: MOVE PEOPLE OUT GOAL: MOVE PEOPLE OUT OF HARM’S WAYOF HARM’S WAY
SOURCE OF PHOTOGRAPHS
USGS
US AIR FORCE
PHILVOS
MOUNT PINATUBO’S FIRST PRECURSORS OF THE ERUPTION
PHILVOS: MONITORING GROUND SWELLING (ANOTHER PRECURSOR)
MOUNT PINATUBO: VERTICAL PLUME REACHES 19 KM: JUNE 12
LOURDES DESTROYED BY LAHARS WITHIN HOURS AFTER THE ERUPTION
MOUNT PINATUBO BLOWS ITS TOP: JUNE 15, 1991
MOUNT PINATUBO BLOWS ITS TOP: JUNE 15, 1991
THE JUNE 15TH CALDERA COLLAPSE LOWERED PINATUBO’S ELEVATION 1,000 FT
LATERAL BLAST: 5:55 AM, JUNE 15
CARS COVERED WITH VOLCANIC ASH: JUNE 16
DC-10 AT CLARK AIR FORCE BASE COVERED WITH ASH: JUNE 17
CLARK AIR FORCE COVERED WITH ASH: JUNE 24
RIVER WIDENED BY LOCAL FLOODING AND LAHARS
The eruption ejected roughly 10 billion metric
tons (10 cubic km) of magma, and 20 million tons
of sulfur dioxide.
The eruption injected large amounts of aerosols into the stratosphere – more
than any eruption since that of krakatoa in 1883.
Lahars that occurred immediately after the
eruption, and rejuvenated during subsequent rainy seasons, have destroyed
over 100,000 homes.
Global temperatures dropped by about 0.5
degree C.