Earthquake
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
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...In certain areas, an earthquake can trigger mudslides...habitations below. A submarine earthquake can cause a tsunami , a...ripple outward from the earthquake epicenter and inundate coastal cities. Major Earthquakes On average about 1,000 earthquakes with intensities of 5.0 or greater are...year. Great earthquakes (intensity 8.0 or higher) occur...