| Discussion on Characteristics of Crustal Deformation along the Zhangjiakou-Bohai Sea Seismotectonic Zone |
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| 作者姓名： | Wang Ruobai |
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| 作者单位： | Wang Ruobai 1)，Gu Guohua 2)，Xu Jie 3) Zhou Wei 1) 1) First Crust Monitoring and Application Center，CEA，Tianjin 300180，China2) Center for Analysis and Prediction，CEA，Beijing 100036，China 3) Institute of Geology，CEA，Beijing 100029，China |
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| 基金项目： | This study was sponsored by the Joint Earthquake Science Foundation of CEA （ Project number： 101107 ）. |
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| 摘 要： | INTRODUCTIONThe Zhangjiakou-Penglai fault zone has drawnextensive attentionfromseismologists and geologistssince it was determinedinthe1980’s(Zheng Binghua,et al.,1981).Ma Xingyuan,et al.(1989)consideredit asthe north boundaryof North China sub-block.Int…
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| 关 键 词： | 渤海 张家口市 地震区域 地壳变形 GPS系统 全球定位系统 |
| 收稿时间： | 2003-08-01 |
| 修稿时间： | 2004-06-07 |
Discussion on Characteristics of Crustal Deformation along the Zhangjiakou-Bohai Sea Seismotectonic Zone |
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| Wang Ruobai.Discussion on Characteristics of Crustal Deformation along the Zhangjiakou-Bohai Sea Seismotectonic Zone[J].Earthquake Research in China,2005,19(3):327-337. |
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| Authors: | Wang Ruobai |
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| Institution: | First Crust Monitoring and Application Center, CEA, Tianjin 300180, China |
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| Abstract: | The Zhangjiakou-Bohai Sea fault zone located in the northern part of the North China region is a seismotectonic zone controlling the present-day strong earthquake activities. Under the effect of regional principal compressive stress with the direction of NEE-SWW, a series of NE-trending active tectonic zones have developed, which form a group of conjugated shear fracturing systems and control the occurrence of the present-day strong earthquakes. The feature of crustal deformation around this fault zone is studied in the paper. The long-term crustal deformation pattern from GPS measurements exhibits a relatively complete left-lateral strike-slip movement along the active fault zone. However, studies on crustal deformation by stages indicate that a series of NE-trending large-scale anomalous gradient zones have appeared along the Zhangjiakou-Bohai Sea fault zone before moderately strong earthquakes. They are represented respectively by the activities of the Tangshan-Hejian, the Sanhe-Laishui and the Yanhuai-Shanxi seismotectonic zones. This may indicate the occurrence of med-term precursors to moderately strong earthquakes along Zhangjiakou-Bohai Sea zone. The results in the paper show that the crustal deformation pattern before strong earthquake reveals the information of strain status in the deep seismogenic zone, while the chaotic pattern after the occurrence of strong earthquake represents the adjustment of the covering strata. |
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| Keywords: | Zhangjiakou-Bohai Sea seismotectonic zone Crustal deformation NE-trending gradient zone |
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