Sonographs of submarine sediment failure caused by the 1980 earthquake off northern California

Geo-Marine Letters
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Abstract

In 1980, a large earthquake caused extensive sediment failure on the shallow continental shelf off the Klamath River in northern California. Side-scan sonography was used to complement detailed geophysical profiling in identifying specific features and resolving modes of failure. The features include a nearly flat failure terrace mantled with sand boils, collapse craters and sediment flows, and bounded on the seaward side by a meandering continuous toe ridge. Seaward of the terrace lies a compression zone delineated by small pressure ridges. Our findings indicate a temporal progression of failure from lique-faction of shallow subsurface sand to lateral spread of intact blocks to sediment collapse and flow. ?? 1982 A. M. Dowden, Inc.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Sonographs of submarine sediment failure caused by the 1980 earthquake off northern California
Series title Geo-Marine Letters
DOI 10.1007/BF02462754
Volume 2
Issue 3-4
Year Published 1982
Language English
Publisher Springer-Verlag
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title Geo-Marine Letters
First page 135
Last page 141