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A geological event caused by shifting tectonic plates, triggered by a sudden release of energy in the Earth's crust that creates seismic waves. Earthquakes are recorded with a seismometer, also known as a seismograph. The moment magnitude (or the related and mostly obsolete Richter magnitude) of an earthquake is conventionally reported. Magnitudes of 3 or lower are mostly imperceptible; magnitudes of 7 or more cause serious damage over large areas. Intensity of shaking is measured on the modified Mercalli scale
Cause of death Direct trauma due to collapse of buildings, dehydration, shock, crush injury
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References in periodicals archive ?
From a physics point of view, seaquakes are often linked to propagation of P acoustic waves through water.
(1996) Seaquakes felt on board a ship, seismic waves seen in a tunnel.
(1987) A study on the effect of seaquakes on a floating body.
Brongersma-Sanders (1957) reviewed factors known to cause mass mortalities in the marine environment, including hypoxia, algal blooms, volcanism, earth- or seaquakes, vertical currents, changes in temperature and salinity, and severe storms.
Working with colleague Prof Adrian Constantin, Prof Johnson has now produced a mathematical formula which helps understand how seaquakes result in tsunami waves.