| 渤海海域地震震源深度的分布特征 |
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| 引用本文： | 谢卓娟,吕悦军,彭艳菊,张力方.渤海海域地震震源深度的分布特征[J].震灾防御技术,2008,3(3):311-320. |
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| 作者姓名： | 谢卓娟 吕悦军 彭艳菊 张力方 |
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| 作者单位： | 中国地震局地壳应力研究所,北京,100085 |
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| 摘 要： | 震源深度的研究对于探索地震孕育和发生的深部环境，地震能量集结、释放的活动构造背景，以及地壳内部构造变形及其力学属性等都有非常重要的意义。本文选择渤海海域内观测精度相对较高的地震资料作为样本，统计分析了不同震级档、不同空间范围的震源深度分布特征，并初步探讨了震源深度与地震构造、地壳结构的关系。结果表明，渤海海域内中小震的震源深度在空间上的分布是不均匀的，发生在渤中断陷内的地震，其震源深度一般较深；而发生在山东半岛北部沿海与辽东半岛沿海的地震，其震级较低且震源一般较浅。但总体上，渤海海域内的地震多发生在10-20km的地壳中、上部，属浅源地震。
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| 关 键 词： | 渤海海域 震源深度 浅源地震 地震构造 |
| 收稿时间： | 8/1/2008 12:00:00 AM |
Focal Depth Distribution of Earthquakes in Bohai Sea Area |
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| Xie Zhuojuan,Lu Yuejun,Peng Yanju and Zhang Lifang.Focal Depth Distribution of Earthquakes in Bohai Sea Area[J].Technology for Earthquake Disaster Prevention,2008,3(3):311-320. |
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| Authors: | Xie Zhuojuan Lu Yuejun Peng Yanju and Zhang Lifang |
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| Institution: | Institute of Crustal Dynamics, China Earthquake Administration, Beijing 100085, China;Institute of Crustal Dynamics, China Earthquake Administration, Beijing 100085, China;Institute of Crustal Dynamics, China Earthquake Administration, Beijing 100085, China;Institute of Crustal Dynamics, China Earthquake Administration, Beijing 100085, China |
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| Abstract: | The research about focal depth is of very great significance, and is widely applied in exploring deep tectonic background of earthquake occurrence and preparation, active tectonic background for concentration and release of seismic energy, and crustal tectonic deformation and its mechanical attributes. In this paper, we choose the seismic data with relatively high precision in the Bohai sea area as the samples to carry out the statistical analysis on the focal depth distribution of earthquakes with different magnitude and spatial scales, and then preliminarily discuss about the relationship between the focal depth distribution characteristics, seismic tectonics and crustal structure. The result shows that the spatial distribution of the focal depth of the small and moderate earthquakes is inhomogeneous in Bohai sea area, the depth of earthquakes is deeper in Bozhong Depressions, while the shallow focal depth and low magnitude exists in the north coast of Shandong Peninsula and Liaodong Peninsula. Overall, the focal depth of earthquakes in the Bohai sea is shallow, ranges from 10---20 km in the middle and upper crust. |
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| Keywords: | Bohai sea area Focal depth Shallow focus earthquake Seismic structure |
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