Case study Isu Oshima landslide

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Earth hazards revision
Case study Isu Oshima landslide
Location: volcanic island 100km south of Tokyo, Japan with a population of 8,500
Consists of multiple landslides which caused the failure of an entire hillside.
Due to heavy rainfall of 824mm (122mm peak in 1 hour) which was due to
Typhoon Whipa.
Presence of soils formed from volcanic ash which is highly unstable and
poses a high risk of liquefaction.
Temporary blackouts in widespread areas.
27 died, 50 missing
283 homes destroyed along with vital services such as hospitals and schools
Businesses destroyed by debris meaning a lack of employment for survivors.
Hundreds of police officers, fire fighters, and troops searched areas where
houses were buried.
Evacuation shelters set up for 8000 people to shelter from another
Several taken to hospital
Concentration moved to evacuating residents rather than searching for
survivors as surfaces are unsafe and the risk of more landslides is high as
there are more Typhoons coming.


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