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学科主题: 地球科学::地球物理学
题名: Temporal and spatial variation of b-value before and after Wenchuan earthquake and its tectonic implication
作者: Liu, YB (Liu Yan-Bing)1, 2; Pei, SP (Pei Shun-Ping)1
通讯作者: Pei, SP
关键词: LONGMENSHAN ; TOMOGRAPHY ; RELOCATION ; SEQUENCE ; CHINA
刊名: CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
发表日期: 2017
DOI: 10.6038/cjg20170607
卷: 60, 期:6, 页:2104-2112
收录类别: SCI
合作性质: 国内
文章类型: Article
类目[WOS]: Geochemistry & Geophysics ; Geochemistry & Geophysics
研究领域[WOS]: Geochemistry & Geophysics
英文摘要: Seismic b-value shows close relationship with stress, with high stress corresponding to low b-values. Research on temporal and spatial variation of b-value in Longmenshan area will provide useful information to understand stress evolution of Wenchuan earthquake. In this paper, we relocated the earthquakes in Longmen Shan region before and after the Wenchuan earthquake (M(S)8. 0) by both joint inversion of hypocenter location and velocity structure and the double difference earthquake location method, and then calculated temporal variation of the b-value in entire region and its spatial distribution in different time periods before and after Wenchuan earthquake. The results show: (1) The b-values show a significant boundary at depth of similar to 15 km, above which the b-value is much higher than that blow 15 km. This boundary indicates the division between brittle and ductile layers in the upper crust. (2) Temporal variation of average b-value shows clear decrease after the Wenchuan Earthquake, and then gradually increases till Lushan earthquake, however decreases again after the Lushan Earthquake. This variation trend represents not only the co-seismic change but also healing process of the Longmenshan fault. (3) Spatial variation of b-value shows increase (i.e. decreased stress) in Wenchuan rupture zone after Lushan earthquake that reveals possible ductile deformation in the gap between the Lushan and the Wenchuan earthquake and the Lushan earthquake promoted the healing of the rupture zone of the Wenchuan earthquake. (4) The significant low b-value anomaly in the Pengguan complex rock area near Yingxiu before Wenchuan earthquake suggests high differential stress in this region and therefore maximum dislocation occurred here after the Wenchuan Earthquake.
语种: 英语
WOS记录号: WOS:000403744600007
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.itpcas.ac.cn/handle/131C11/8204
Appears in Collections:图书馆_期刊论文

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作者单位: 1.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Continental Collis & Plateau Uplift, Beijing 100085, Peoples R China.
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China.

Recommended Citation:
Liu, YB ,Pei, SP . Temporal and spatial variation of b-value before and after Wenchuan earthquake and its tectonic implication[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2017,60(6):2104-2112.
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文件名: V.60(6) 2104-2112 2017.pdf
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