Rock Avalanches Caused by Earthquakes: Source Characteristics

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Science  23 Mar 1984:
Vol. 223, Issue 4642, pp. 1288-1290
DOI: 10.1126/science.223.4642.1288

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Study of a worldwide sample of historical earthquakes showed that slopes most susceptible to catastrophic rock avalanches were higher than 150 meters and steeper than 25 degrees. The slopes were undercut by fluvial or glacial erosion, were composed of intensely fractured rock, and exhibited at least one other indicator of low strength or potential instability.