Location and Focal Mechanism of the 1933 Diexi Earthquake and Its Associated Regional Tectonics
详细信息
- 责任者：Wang Kang (School of Earth and Space Sciences ; Peking University ; Beijing 100871 ; China) ; Shen Zhengkang
- 刊名：Acta Seismologica Sinica
- 出版年：2011
- 卷期：33(5)
- 关键词：震源机制 ; focal mechanism ; 区域构造 ; regional tectonics ; 四川 ; Sichuan Province
- 页码：p.557-567
- 图表：4 illus., 1 table, 33 refs.
- 分类号：0500
- 出版序号：1605
- issnNo：ISSN0253-3782
- isbnNo：CN11-2021/P
摘要
///The 1933 M7.5 Diexi, Sichuan Province, earthquake in western China caused tremendous loss of human lives and property damage. Having collected worldwide seismic records of this earthquake, among which some polarities of the first arrival phases were picked, the authors relocated this earthquake and obtained the fault plane solution through grid search. The authors conclude that the seismogenic structure is the southern segment of the Minjiang fault, which was dominated mainly by sinistral slip with a minor thrust component. GPS velocity profile across the Minshan mountains indicates that the Huya fault absorbs about 2 mm/a crustal shortening, which is associated with the rapid uplift process of the Minshan mountains since Quaternary. A discrepancy between the focal mechanism of the 1933 Diexi earthquake and the GPS determined present sense of motion across the Minjiang fault may be attributed to the interaction of crustal deformation processes of the Longmenshan and Minjiang fault systems and their earthquake cycles, particularly the role of Longmenshan fault system in modifying the regional deformation field at the late stage of preparing the 2008 Wenchuan earthquake.
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