| Recent Crustal Stress Field and Dislocation Along Seismic Faults in the East China Region |
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| 作者姓名： | Zhou Cuiying |
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| 作者单位： | Zhou Cuiying 1)，Wang Zhengzheng 2)，Jiang Haikun 1)，Li Yonghong 2) and Wu Yanhe 1) 1) Earthquake Administration of Shandong Province，Jinan 250014，China 2) Earthquake Administration of Jiangsu Province，Nanjing 210014，China |
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| 基金项目： | TheresearchwassupportedunderaprojectoftheStateKeyScienceandTechnologyProgram(2001BA601B10401),China. |
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| 摘 要： | INTRODUCTIONThere exist many methods for studying recent crustal stress field.One of the most commonmethodsis to use focal mechanismsolution data of earthquakes to deduce the recent crustal stressfield.The method is simple and feasible and the data obtained is reliable.Yan Jiaquan,et al.(1979)usedthe method to study the recent tectonic stress field in China and its adjacent areas andgave a rough configuration and regional characteristics of the stress field.Li Qinzu(1980),WeiGuangxing,e…
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| 关 键 词： | 中国 东部地区 地震 位错 断层 地壳结构 |
| 收稿时间： | 2004-05-24 |
| 修稿时间： | 2004-10-08 |
Recent Crustal Stress Field and Dislocation Along Seismic Faults in the East China Region |
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| Zhou Cuiying.Recent Crustal Stress Field and Dislocation Along Seismic Faults in the East China Region[J].Earthquake Research in China,2005,19(4):442-457. |
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| Authors: | Zhou Cuiying |
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| Institution: | Zhou Cuiying 1),Wang Zhengzheng 2),Jiang Haikun 1),Li Yonghong 2) and Wu Yanhe 1) 1) Earthquake Administration of Shandong Province,Jinan 250014,China 2) Earthquake Administration of Jiangsu Province,Nanjing 210014,China |
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| Abstract: | A statistic analysis of the characteristics of recent tectonic stress fields in the East China region was performed using 143 sets of data of single focal mechanical solutions of moderate and small earthquakes and 17 sets of data of composite focal mechanism solutions. The result shows that at present the East China region is controlled by an ENE_(about 80°) oriented principal compressive and NNW_(about 350°) oriented principal tensile stress field. The effect mode of the principal stress is mainly horizontal and sub_horizontal. In a background of basic consistency of the direction and effect mode of stress field, the existence of different seismotectonic zones may be related to the distribution of major active faults in the relevant areas. It indicates the effect and control of the existing structures on the seismic dislocation. Analysis of focal mechanism solution data of recent moderate and small earthquakes and directions of long axes of isoseismal contours of historic moderate and strong earthquakes and recent felt earthquakes indicates that seismic rupture and dislocation in East China region occurred mainly along the faults in NE and NW directions, and sometimes in NNE, ENE, WNW or near_WE directions. Movement along the seismic faults is mainly strike_slip or near_strike_slip, with a less oblique slip component. Regional difference in dislocation modes exist along the seismic faults. The historical moderate and strong earthquakes in East China produced mainly NE_trending ruptures and dislocations, while the recent earthquakes produced NW_SE ruptures and dislocations in the land region and NE and NW ones in the sea areas. |
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| Keywords: | Focal mechanism solution Crustal stress field Seismic fault Dislocation East China region |
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