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| 引用本文： | 于湘伟,张怀,陈运泰.���������������¶�λ�������[J].大地测量与地球动力学,2010,30(2):29-33. |
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| 作者姓名： | 于湘伟 张怀 陈运泰 |
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| 作者单位： | 1. 中国科学院研究生院计算地球动力学实验室,北京,100049
2. 中国地震局地球物理研究所,北京,100081 |
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| 基金项目： | 国家重点基础研究发展规划项目，国家自然科学基金，中国地震局预测研究所合作项目 |
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| 摘 要： | ????????λ???????????(111??120??E??35??42??N)1993??2004??6 771?ε???1.0??M??6.6???????λ???????λ???????????????????????????????????????????????;???o?????·???????????????????????????б???????????????????????????????????20 km????60 km???????25 km??34 km?????40 km;83%???????????λ??0??15 km??Χ?????????????λ???????????????(7??21 km)????????????????????????????????????????????????;???92%???????????λ??1??24 km??????24 km??????????????????????硣
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| 关 键 词： | ??????λ?? ???????? ??????? ?????? ?o???? |
ANALYSIS OF RELOCATED EARTHQUAKES IN NORTH CHINA REGION |
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| Yu Xiangwei,Zhang Huai,Chen Yuntai.ANALYSIS OF RELOCATED EARTHQUAKES IN NORTH CHINA REGION[J].Journal of Geodesy and Geodynamics,2010,30(2):29-33. |
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| Authors: | Yu Xiangwei Zhang Huai Chen Yuntai |
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| Institution: | 1)Laboratory of Computational Geodynamics，Graduate University of Chinese Academy of Sciences，Beijing 1000492)Institute of Geophysics，China Earthquake Administration，Beijing 100081 |
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| Abstract: | We relocuted epicenters of totally 6 771 earthquakes which occurred in North China region (35°～42°N, 111°～120°E) from 1993 to 2004. The relocation shows those formerly randomly-distributed earthquakes are clustered and are aligned tending to the North-East and North-West directions. It follows that there is a close relationship between the seismicity and known major active faults. From the cross sectional profile beneath the Xinhe fault, the relocated seismic sources reveal two seismic belts of different depths. One of them is around 60km long and in the direction of north-east, its depth varies from the surface downwards to 20 km underground. The other is about 40 km in length and is from 25km to 30 km in depth.At the same time, we found that the 83 percent relocated hypocenters vary from 0 km to 15 km in depth. This is certainly more shallow than that from the previous studies which are based on the roubine earthquake location, whose average focal depth is within a range of 7～21km. This result indicates that the contemporary seismicity in North China region is mainly concentrated in the upper and middle crusts. Furthermore, about 92 percent focal depth is ranged from 1 km to 24 km, which is in good agreement with the consensus that the lower bound of the focal depth in North China region is 24 km. |
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| Keywords: | double-difference relocation method North China region seismicity focal depth Xinhe fault |
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