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Landslides caused by the Klamath Falls, Oregon, earthquakes of September 20, 1993

Earthquakes & Volcanoes (USGS)
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Abstract

The Klamath Falls earthquakes caused landslides throughout an area of about 420 sq km and as far as about 29 km from the epicenter, a distribution that is typical for magnitude 6 earthquakes (see graphs on following pages). Most of the landslides were rock falls or shallow, highly disrupted rock slides from roadcuts, quarries, and steep bluff faces. Such landslides are also among the most common types caused by other earthquakes of comparable magnitude. 

In the Klamath Falls area, the most numerous earthquake-induced rock falls were along the east-to southeast-facing flank of a ridge immediately south and west of Howard Bay (locality 1 on the accompanying map), 18 km east-southeast of the epicenter of the magntiude 6.0 shock at 10:45 p.m. This ridge is more than 240 m high and has slopes steeper than 45° in places. The upper part of the ridge is composed of material from basaltic lava flows, an the lower slopes are covered with colluvium and talus deposits containing abundant boulders. 

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Landslides caused by the Klamath Falls, Oregon, earthquakes of September 20, 1993
Series title Earthquakes & Volcanoes (USGS)
Volume 24
Issue 3
Year Published 1993
Language English
Publisher U.S Geological Survey
Description 7 p.
First page 140
Last page 146
Country United States
State Oregon
Other Geospatial Klamath Falls
Online Only (Y/N) N
Additional Online Files (Y/N) N