Journal ArticleDOI
Late Holocene Paleoseismicity of the Southern Part of the Chelungpu Fault in Central Taiwan: Evidence from the Chushan Excavation Site
Wen-Shan Chen,Chih-Cheng Yang,I-Chin Yen,Long-Sheng Lee,Kun-Jie Lee,Hsiao-Chin Yang,Hui-Cheng Chang,Yoko Ota,Chii-Wen Lin,Wei-Hsiung Lin,Tung-Sheng Shih,Shih-Ting Lu +11 more
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TLDR
Based on core-boring estimates, the vertical displace- ment on both sides is 7 m along a 24 east-dipping thrust fault, which ruptured during the Chichi earthquake.Abstract:
The geomorphic expression of the frontal Western Foothills in central Taiwan is usually defined by a late Holocene scarp that ranges from tens to hundreds of meters in height. This scarp is the product of displacement on a near-surface 20- 30 east-dipping thrust fault, the Chelungpu fault, which ruptured during the Chichi earthquake. The large scarp height may correspond directly to the accumulation of successive surface ruptures. The Chushan site is located on the southern part of this fault where the Chichi earthquake produced a scarp with a 1.7-m vertical offset for the total vertical separation. Based on core-boring estimates, the vertical displace- ment on both sides is 7 m along a 24 east-dipping thrust fault. The results from our paleoseismic analysis indicate that five large paleoearthquake events have caused the large offsets during the past 2 ka. The radiocarbon age constraints of the paleoearth- quakes suggest a clustering of 540-790 cal yr B.P. (E2), 710-950 cal yr B.P. (E3), 1380-1700 cal yr B.P. (E4), 1710-1930 cal yr B.P. (E5), and the 1999 Chichi earth- quake. Events E3 and E4 have not been reported in previous studies and we did not observe event E1 (300-430 cal yr B.P.) at the site. Based on displacement and fault segmentation from the geologic features, we argue that the two new events may have occurred along the northern part of the Chelungpu fault. The vertical slip rate is estimated to be at least 3.9 0.2 mm/yr over the past 2 ka, which is similar to the long-term estimation through a calculation of late Pleistocene-Holocene terrace el- evations on the hanging wall.read more
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A New On-Land Seismogenic Structure Source Database from the Taiwan Earthquake Model (TEM) Project for Seismic Hazard Analysis of Taiwan
TL;DR: The Taiwan Earthquake Model (TEM) project, supported by the Ministry of Sciences and Technology, evaluates earthquake hazard, risk, and related social and economic impact models for Taiwan through multidisciplinary collaboration.
Journal ArticleDOI
Effect of ice sheet growth and melting on the slip evolution of thrust faults
TL;DR: In this article, the authors used finite element models including a thrust fault embedded in a rheologically layered lithosphere to investigate its slip evolution during glacial loading and subsequent postglacial unloading.
Journal ArticleDOI
Erosion influences the seismicity of active thrust faults
TL;DR: In this article, it was shown via amechanical model that erosion also significantly influences the stress loading of thrust faults at the timescale of a seismic cycle and that erosion rates of about B0.1-20mmyr1, as documented in Taiwan and in other active compressional orogens, can raise the Coulombstress by B 0.1 -10 bar on nearby thrust faults over the inter-seismic phase.
Journal ArticleDOI
Paleoseismic events and recurrence interval along the Beichuan–Yingxiu fault of Longmenshan fault zone, Yingxiu, Sichuan, China
TL;DR: In this paper, the authors conducted a study along the 2008 Wenchuan earthquake fault scarp at the town of Yingxiu along the Beichuan-Yingxiu fault.
Journal ArticleDOI
Spatio-temporal Slip, and Stress Level on the Faults within the Western Foothills of Taiwan: Implications for Fault Frictional Properties
Ya-Ju Hsu,Ya-Ju Hsu,Jean Philippe Avouac,Shui-Beih Yu,Chien-Hsin Chang,Yih-Min Wu,Jochen Woessner,Jochen Woessner +7 more
TL;DR: In this article, the authors used GPS data of the 1999 Chi-Chi earthquake to infer spatio-temporal variation of fault slip and frictional behavior on the Chelungpu fault.
References
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Journal ArticleDOI
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Journal ArticleDOI
Imaging the Upper Crust of the Korean Peninsula by Surface-Wave Tomography
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