https://scholars.lib.ntu.edu.tw/handle/123456789/330789
標題: | Coseismic fold scarps and their kinematic behavior in the 1999 Chi-Chi earthquake Taiwan | 作者: | Chen, Yue-Gau Lai, K.-Y. Lee, Y.-H. Suppe, J. WEN-SHAN CHEN Lin, Y.-N.N. 王昱 Hung, J.-H. Kuo, Y.-T. |
公開日期: | 2007 | 卷: | 112 | 期: | 3 | 來源出版物: | Journal of Geophysical Research: Solid Earth | 摘要: | Discrete scarps that are created or reactivated during large earthquakes are a locus of concentrated hazard. A number of the coseismic scarps activated in the 1999 Chi-Chi earthquake are actually fold scarps, which display several types of ground deformation characterized by localized folding and are distinct from classic fault scarps, which form by a fault cutting the surface. This paper documents and analyzes fold scarps that formed or reactivated in the 1999 Chi-Chi Taiwan earthquake. Our results show the Chi-Chi fold scarps can be generally divided into two types: (1) those associated with folding ahead of the tip of a blind thrust fault at shallow depths and (2) those associated with folding by kink band migration above fault bends at substantial depths ranging from ∼0.8 to 5 km). The previously published trishear model can be applied to model the former type, while a new curved hinge kink band migration model is provided to describe the behavior of the latter type. A key feature of fold scarps of the second type is that hinge zones are typically wide (25-100 m) relative to the displacement in a single earthquake (1-10 m), which exerts a significant control on fold scarp morphology and evolution. Because the coseismic strains of both types of fold scarps display relatively wide deformation zones (10-100 m) relative to fault scarps, wider set-back zones might be appropriate from a public policy point of view to alleviate the risk to structural damage and collapse resulting from permanent ground deformation. Copyright 2007 by the American Geophysical Union. |
URI: | http://www.scopus.com/inward/record.url?eid=2-s2.0-34548556342&partnerID=MN8TOARS http://scholars.lib.ntu.edu.tw/handle/123456789/330789 |
DOI: | 10.1029/2006JB004388 |
顯示於: | 地質科學系 |
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