Mt Pinatubo June 7, 1991

Mt Pinatubo 15°08′30″N 120°21′00″E 1,485 m (4,872 ft)(current) 1,745 m (5,725 ft) (before 1991 eruption)

Maps

Pinatubo  Stratavolcano  Formed from a convergent boundary and is usually Felsic composition.  Felsic eruptions create a lot of ash and little magma.  Very explosive!  Vey common

Plate Tectonics This a cross sectional map of Mt Vesuvius in Italy. Where Italy is located is very similar to the set up of Pinatubo.

When…  March till June the pre-eruption phase.  Eruption lasted two days.  Post eruption lasted about a year, which altered weather.  Past events:  35,000 years ago (5 times larger)  17,000 years ago  9,000 years ago  6,000 years ago  3,000 years ago  500 years ago

Time line  July 1990, Major earthquake in Luzon  Possible future eruption  March 1991, Series of earthquakes on NW side of mountain.  May 1991, Gases increase.  June 7 th 1991, Complete evacuation  June 13 th 1991, Explosive eruption (many little explosions before).

What causes this event?  When tectonic plates converge together one plate subducts.  That plate then heats, melts and with the increased friction earthquakes become common.  The shaking from the earthquakes allow the melted rock to rise adding to the pressure.  The lava dome is created.  When the walls cannot hold the force they explode.

Who is affected?  Everyone within 40 Km was affected directly.  Clark Airbase was evacuated.  Three provinces were affected.  The whole world was impacted from this eruption within a year.  1992 November NY had a blizzard. Caused from lack of sun light.

Possible Warning  There was a warning that was pretty accurate.  All that people could do was to evacuate.  Evacuation plans were enacted.  Scientists stayed at the base as long as they could to collect data.

Facts  847 dead  Evacuations saved 10,000 lives  2.1 million were directly affected.  150 Km 2 of land was destroyed.  42% of land was destroyed  The GDP of the area dropped 3% after the eruption.  Compare to other events

 Report from air base and the President on Pinatubo.

What If...  Ash was ejected 50 Km or 30 miles up.  Mt Vesuvius in 79 AD was about the same size.  2011 earthquake swarms recorded with no eruption.

Works Cited  philippines philippines-1991  sadvantages-of-volcano/ sadvantages-of-volcano/ 