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PROCEEDINGS OF JAPAN EARTHQUAKE ENGINEERING SYMPOSIUM
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Kumizi IIDA, Hitoshi TANIGUCHI
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GROUND LIQUEFACTION AND ITS DAMAGE TO HOUSES DUE TO PAST EARTHQUAKES IN TOKAI DISTRICT JAPAN
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About 45 percent of 38 disastrous earthquakes occurred in the Tokai district, Japan during the period from 1800 to 1985 brought ground liquefaction which was observed at several hundred hamlets being limited only to alluvial sandy deposits in river basins and reclaimed lands. It was found that liquefaction occurred repeatedly in different earthquakes in the same sites, and usually followed earthquakes having magnitude greater than 7.3 and seismic intensity about the fifth grade in JMA scale, corresponding to maximum acceleration of 80 to 250 gals. Earthquake damage to houses in liquefied areas was 10 to 30 percent greater than that of earthquakes without liquefaction. The extent of liquefied zone depends on earthquake magnitude.
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