Mass movement case study Izu Oshima landslide

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Global issues revision
Mass movement case study: Izu Oshima, Japan 2013
Volcanic Island 100km south of Tokyo with a population of 8,500.
Consisted of multiple land slide events which were caused by the failure of
the entire hillside. Due to high rainfall (824mm in total) which resulted
from Typhoon Whipa
Presence of volcanic soils formed from volcanic ash which is highly unstable
and poses a high risk of liquefaction.
Social: temporary blackouts in some areas, 27 people dies and 50 missing,
283 homes destroyed along with vital services such as hospitals and schools.
Economic: businesses destroyed by debris meaning a lack of employment for
Hundreds of emergency personnel searched for survivors in areas where
houses were buried.
Evacuation shelters set up to shelter 8000 people from typhoon Whipa.
People airlifted afterwards to prevent further deaths from another
approaching storm
Several people taken to hospital
Concentration shifted from looking for survivors trapped under rubble to
evacuating residents as the surfaces were too unstable to be safe to search
Voluntary evacuation of 900 people.


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