Identification of co-seismic ground motion due to of the Tsaoling landslide, Taiwan fracturing and impact

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Title:	Identification of co-seismic ground motion due to of the Tsaoling landslide, Taiwan fracturing and impact
Authors:	Kuo, Chih-Yu Chang, Kuo-Jen Tsai, Pi-Wen Wei, Shao-Kuan Chen, Rou-Fei Dong, Jia-Jyun Yang, Che-Ming Chan, Yu-Chang Tai, Yih-Chin
Contributors:	Dept Geol
Keywords:	Chi-Chi earthquake empirical mode decomposition statistical clustering analysis transient elastic wave Newmark analysis
Date:	2015-09
Issue Date:	2015-10-19 10:58:38 (UTC+8)
Abstract:	Earthquakes can generate seismic disturbances that propagate vast distances and trigger landslides that can achieve high-speeds. It remains difficult to identify the co-seismic ground motion of these landslides and their triggering earthquakes. In this paper, we report on the analysis of co-seismic ground motions generated by the initiating fracture and deposition impact of the Tsaoling landslide. The landslide, with a source volume of 125 x 10(6) m(3), was triggered by the 1999 Chi-Chi earthquake in Taiwan. The ground motion was recorded by a strong ground motion station, CHY080, near the scar area. The polarization of the seismic waves indicates that the peak acceleration was parallel to the dip direction. Modified ensemble empirical mode decomposition (EEMD), with additional clustering analysis, was applied to decompose the seismic signals. Two instances were found in the seismic records of a series of peculiar wave packets, with the first being associated with the landslide initiation and the second the landslide impact on the deposit valley. To confirm the first landslide breakage, the decomposed signals were compared with the predictions of the analytic elastic wave model and Newmark analysis. The landslide impact was verified with a computational fluid dynamic simulation. Comparison between the EEMD decomposed signals, elastic wave theory, Newmark rigid body analysis, and numerical simulation demonstrates the claimed landslide motion. (C) 2015 Elsevier B.V. All rights reserved.
Relation:	ENGINEERING GEOLOGY 卷: 196 頁碼: 268-279
Appears in Collections:	[Department of Geography & Graduate Institute of Earth Science / Geography ] journal articles

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