Earthquakes

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Liquefaction, which happens when loosely packed, water-logged sediments lose their strength in response to strong shaking, causes major damage during earthquakes. During the 1989 Loma Prieta earthquake, liquefaction of the soils and debris used to fill in a lagoon caused major subsidence, facturing, and horizontal sliding of the ground surface in the Marina district in San Francisco.

Today in Earthquake History

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November 21, 1997
M 6.1, India – Twenty-three people killed, 200 injured, and a five-story building collapsed at Chittagong, Bangladesh. Houses damaged and old trees uprooted at Alikadam,… Read More

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