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659753
Tsunamis
Descrição
Undergraduate Physical Geography (The structure of the Earth) Mapa Mental sobre Tsunamis, criado por Sharondeep em 21-03-2014.
Sem etiquetas
physical geography
the structure of the earth
physical geography
the structure of the earth
undergraduate
Mapa Mental por
Sharondeep
, atualizado more than 1 year ago
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Criado por
Sharondeep
mais de 10 anos atrás
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Resumo de Recurso
Tsunamis
huge tidal waves caused by the displacement of the sea bed
may be caused by an EQ
caused by the dumping of sediments around the coast or near deep-sea trenches
a series of waves may be set up with wavelengths of several hundred kms
so much energy they can reach speeds of 900 km per hour
a large tsunami can cross the Pacific in about 24 hours
Height = depth of body of water
may be unnoticeable in the deep ocean so the effects are most intense in shallow waters
shelving coastlines vulnerable
Most dangerous occur in Pacific ocean as surrounded by margins
The Pacific Tsunami Warning System triggers warnings if an eq greater then 6.5 on the Richter scale is detected
69 seismic stations
E.g. 2004 magnitude 9.0 eq in northerm Sumatra led to a tsunami killing over 100,000 people in countries in Indian Ocean
Initiates need to set up warning systems in the Indian and Atlantic Oceans
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