Pinatubo Flashcards

1
Q

Where is Pinatubo located?

A

in the Phillipines

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2
Q

What island is Pinatubo located on?

A

Luzon

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3
Q

When was Pinatubo’s last eruption?

A

12th June 1991

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4
Q

What sort of lava flow did Pinatubo have?

A

andesitic

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5
Q

Describe andesitic lava?

A

thick and full of gas

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6
Q

How does andesitic lava effect eruptions?

A

Makes them more explosive

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7
Q

At what speed did pyroclastic flow descend from the crater?

A

20kmph

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8
Q

How far up was a cloud of steam and gas sent?

A

30km up into the atmosphere

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9
Q

What type of volcano is Pinatubo?

A

composite

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10
Q

What is the main way that the effects of the eruption were mitigated?

A

volcanologists predicted the eruption so advanced warnings allowed 1000s of people to evacuate the area

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11
Q

How many homes were damaged?

A

70,000

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12
Q

How were power supplies, roads and bridges effected?

A

they were left unusable

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13
Q

What happened to the water supply?

A

It became contaminated

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14
Q

What other natural disaster hit at the same time as the eruption?

A

Typhoon Yunya

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15
Q

Where were many people displaced to?

A

Shanty towns on the edge of Manila

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16
Q

How did the gas cloud dispersion affect the world globally?

A

global temperature dropped temporarily(1991-93) -0.5 degrees Celsius

17
Q

What happened in the evacuation camps?

A

hundreds of people died from diseases (mainly measles, pneumonia and diahorrea)

18
Q

How much area of rice fields did the ash cover?

19
Q

What was closed and moved to singapore?

A

US air force base

20
Q

How did the US air force base moving affect the Filipino population?

A

many Filipinos lost their jobs and local trade suffered great loses

21
Q

What does PHIVOLCS stand for?

A

Philippine institute of volcanology and seismology

22
Q

What did the seismologists detect in March 1991?

A

they detected swarms of earthquakes beneath Pinatubo which indicated that magma was on the move

23
Q

What was the response to the detection in 1991?

A

-helicopters with gas monitoring equipment flew over the crater daily
-tiltmeters were installed to monitor the deformation of the surface as magma rises

24
Q

What happened when warnings were issued?

A

-local people evacuated
-vaccinations given to combat measles and flu
-international emergency aid provided for after the eruption+lahar

25
How did Luzon authorities convert the US air base?
they converted it into Clark International Airport
26
How many people does Clark international airport now employ?
47,000
27
What are some long term initiatives that the Luzon authorities have established?
- dykes + dams to protect against lahars and flash floods
28
What did the gas cloud contain?
10mil tonnes of sulphur dioxide