Visit to Japan to Observe Damage Which Occurred during the Near IZU Oshima Earthquakes, January 14 and 15, 1978.

Abstract

The magnitude 7.0 earthquake near Izu Oshima occurred at 12:24 p.m. on 14 January 1978. The main aftershock occurred on 15 January and had a magnitude of 5.7. These two earthquakes are believed to have caused liquefaction of tailings and two dam failures which resulted in some 80,000 cu m of tailings flowing down the mountainside and into a stream. These tailings, containing sodium cyanide, contaminated the stream all the way to the Pacific Ocean, a distance of 30 km. The tailings dams were approximately 30 m high and were constructed using the upstream construction method. These dams had been previously analyzed pseudostatically using a seimsmic coefficient of 0.2. This case history clearly indicates that a pseudostatic analysis using routine static soil properties as input is not appropriate if liquefaction is the mode of failure. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1979
Accession Number
ADA075448

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  • Willima F. Marcuson Iii

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