Open AccessEvidence for prehistoric coseismic folding along the Tsaotun segment of the Chelungpu fault near Nan‐Tou, Taiwan
Author(s) -
Streig Ashley R.,
Rubin Charles M.,
Chen WenShan,
Chen YueGau,
Lee LongSheng,
Thompson Stephen C.,
Madden Chris,
Lu ShihTing
Publication year - 2007
Publication title -
journal of geophysical research: solid earth
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.67
H-Index - 298
eISSN - 2156-2202
pISSN - 0148-0227
DOI - 10.1029/2006jb004493
Subject(s) - geology , seismology , fault scarp , radiocarbon dating , fault (geology) , thrust fault , aftershock , paleontology
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.