Evidence for prehistoric coseismic folding along the Tsaotun segment of the Chelungpu fault near Nan-Tou, Taiwan
Resource
JOURNAL OF GEOPHYSICAL RESEARCH 112: B03S06
Journal
Journal of Geophysical Research: Solid Earth
Journal Volume
112
Journal Issue
3
Date Issued
2007
Author(s)
Streig, Ashley R.
Rubin, Charles M.
Lee, Long-Sheng
Thompson, Stephen C.
Madden, Chris
Lu, Shih-Ting
Abstract
Taiwan's 1999 M w 7.6 earthquake generated over 85 km surface rupture along the Chelungpu thrust fault. Paleoseismic studies at the Shi‐Jia site near Nantou city, reveal folding as the predominant form of deformation. Stratigraphic relations across the 1999 fold scarp show the style and degree of deformation caused by the penultimate event is similar to observed 1999 deformation. A boring transect across the fold scarp provides additional evidence of an earlier earthquake. Investigations at the Shi‐Jia site revealed three prehistoric events; accelerator mass spectrometry (AMS) radiocarbon ages indicate that the penultimate earthquake occurred between 1160 and 1440 A.D. Paleoseismic studies north of the Shi‐Jia site reveal much younger penultimate earthquakes, suggesting a 1999‐type event may not be characteristic along the Tsaotun segment of the Chelungpu fault.
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journal article
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