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Plate Tectonics Case Studies
Volcanic case studies

Mount Pinatubo
This caused the most atmosphere disturbance since Krakatau due to the vast amount of ash

Where: Philippines, East Asia

Plate boundary: Philippine plate sub-ducts beneath the Eurasian plate

When: 19,91, 7th to 15th June

Type of volcano: Composite or stratovolcano…

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After June 15th: A large amount of sulphur dioxide to be released (15 to 30 million tons), this
mixed with water and oxygen to become sulphuric acid to fall as rain which is harmful to
people. The gas and ash reached 34km into the atmosphere which was then transported

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Some people moved away from the area

Mount Saint Helens
This is the most devastating and costliest volcanic eruption in the history of the United
States of America.

Where: North America, In the state of Washington

When: March 20thto May 18th 1980

What plate boundaries: Subduction zone Juan de fucia…

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There was a lateral blast due to plug being removed, which reached 17miles north of the
volcano which had temperature of up to 350°c
Lahars came from the Columbia and the Cowlitz River which affected up to 300km of the
Pyroclastic flow covered an area of 6 miles and…

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Lots of ash had to be removed with an estimated weight of 1 million tonnes and cost $2.2
million to remove and some places even took 10 weeks to be cleared
Lots of timber had to be cleared so many people gained jobs if only temporary
$1 billion was…

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Communications There was severe damage to the
communications infrastructure with all TV and
telecommunications cut off
Disease There was also diseases easily spread through
the country with as severe outbreak of Cholera
after the earthquake

There were make shift shanty towns built for the millions of homeless
Due to…

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horizontally. There was a big outbreak of fires all over the city which caused most deaths
there were also over 1,300 aftershocks. There was also some liquefaction.

Impact Description
People killed Over 6300
Injured 40 thousand
Infrastructure Roads blocked by debris and the Hanshin
Expressway, motorway built on stilts

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There were more seismographs and other machines installed in order to better keep
track of how the earth was moving, so they would be better prepared next time.
The highway had rubber blocks to help absorb the shock installed
Buildings were built further apart so less likely to collapse onto…


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