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Influence of Surface-Normal Ground Acceleration on the Initiation of the Jih-Feng-Erh-Shan Landslide during the 1999 Chi-Chi, Taiwan, Earthquake

Central Geological Survey
No. 2, Lane 109, Huahsin Street
Chungho Taipei, Taiwan
huangcc{at}linx.moeacgs.gov.tw
dljp{at}linx.moeacgs.gov.tw
(C.-C.H., Y.-H.L.)
U.S. Geological Survey
MS 977
345 Middlefield Road
Menlo Park, California 94025
liu{at}usgs.gov
dkeefer{at}usgs.gov
(H.-P.L., D.K.K.)
U.S. Geological Survey
Box 25046, MS 966
Denver Federal Center
Denver, Colorado 80225
jibson{at}usgs.gov
(R. W. J.)

Manuscript received 24 August 2000.

The 1999 Chi-Chi, Taiwan, earthquake triggered numerous landslides throughout a large area in the Central Range, to the east, southeast, and south of the fault rupture. Among them are two large rock avalanches, at Tsaoling and at Jih-Feng-Erh-Shan. At Jih-Feng-Erh-Shan, the entire thickness (30-50 m) of the Miocene Changhukeng Shale over an area of 1 km² slid down its bedding plane for a distance of about 1 km. Initial movement of the landslide was nearly purely translational. We investigate the effect of surface-normal acceleration on the initiation of the Jih-Feng-Erh-Shan landslide using a block slide model. We show that this acceleration, currently not considered by dynamic slope-stability analysis methods, significantly influences the initiation of the landslide.