| 京西北地区地震重定位分析 |
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| 引用本文： | 蔡玲玲,李冬圣,孟立朋,常亮,温超,王宁. 京西北地区地震重定位分析[J]. 地震地磁观测与研究, 2017, 38(3): 47-52. DOI: 10.3969/j.issn.1003-3246.2017.03.009 |
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| 作者姓名： | 蔡玲玲 李冬圣 孟立朋 常亮 温超 王宁 |
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| 作者单位： | 中国石家庄 050021 河北省地震局 |
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| 基金项目： | 2017年度测震台网青年骨干专项（项目编号：20170604） |
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| 摘 要： | 利用双差地震定位方法,针对京西北地区(39.5°—41.5°N,113.5°—116.5°E)2008—2016年记录的地震进行重新定位,最终得到1819次地震精定位结果。分析表明:地震密集区域多集中分布在NE和NW向断裂交汇区域,成条带的地震走向更加清晰,成簇性地震分布更加收敛,体现了断裂对震中分布具有较强的控制作用;震源深度优势分布主要集中在4—14 km范围,表明京西北地区地震主要发生在的中上地壳;震源深度剖面显示,在不同的地震密集区,孕震深度有一定差别,揭示了断裂的深部展布特征,反映了一些地区深部发震构造的复杂性。
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| 关 键 词： | 京西北地区 双差定位 地震精定位 断裂 震源深度 |
Analysis of seismic relocation in northwest Beijing |
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| Cai Lingling,Li Dongsheng,Meng Lipeng,Chang Liang,Wen Chao,Wang Ning. Analysis of seismic relocation in northwest Beijing[J]. Seismological and Geomagnetic Observation and Research, 2017, 38(3): 47-52. DOI: 10.3969/j.issn.1003-3246.2017.03.009 |
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| Authors: | Cai Lingling Li Dongsheng Meng Lipeng Chang Liang Wen Chao Wang Ning |
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| Affiliation: | Hebei Earthquake Agency, Shijiazhuang 050021, China |
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| Abstract: | Using double difference position method, the seismic records in northwest Beijing(39.5°-41.5° N, 113.5° -116.5° E)since 2008 to 2016 is relocated and the new hypocentral location of 1819 earthquakes are obtained. The results show that the concentrated areas of earthquakes focus mostly in the join regions of the faults in NE and NW strikes. The strike of cluster earthquakes becomes clearer, and more convergence, reflecting that the fracture having a strong role in the earthquake epicenter distribution. The dominant distribution of focal depth is in the range of 4-14 km, it indicated that the earthquakes occurred mainly in the middle upper crust. The focal depth profile, showing in the dense region of different earthquake, shows that the seismogenic depth has certain difference, and also reveals the deep fracture distribution characteristics, while also reflects the complexity of the seismogenic structure in deep part. |
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| Keywords: | northwest of Beijing double difference earthquake location precise location of earthquake crack hypocenter depth |
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