Mt PinatuboJune 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

PinatuboStratavolcano

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 7th 1991, Complete evacuation

June 13th 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 WarningThere 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 Km2 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

http://volcano.oregonstate.edu/mt-pinatubo-philippines-1991

http://golearngeo.wordpress.com/2010/03/03/disadvantages-of-volcano/

http://en.wikipedia.org/wiki/Mount_Pinatubo