| 运用改进的地震定位交切法重定位2001—2010年云南地震 |
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| 引用本文： | 周建超,赵爱华,何正勤.运用改进的地震定位交切法重定位2001—2010年云南地震[J].地震地磁观测与研究,2017,38(6):30-33. |
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| 作者姓名： | 周建超 赵爱华 何正勤 |
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| 作者单位： | 中国北京 100081 中国地震局地球物理研究所 |
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| 基金项目： | 中央级公益性科研院所基本科研业务费专项（项目编号：DGJB13B18）；前兆综合地球物理场信息可视化处理技术研究——基于地形变数据（项目编号：2017010217） |
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| 摘 要： | 传统地震定位方法利用震源轨迹确定震源位置，但基于均匀或横向均匀介质模型必然导致定位误差。为此对传统方法进行改进，发展适用于三维复杂地壳速度模型的地震定位交切法。利用最小走时树射线追踪技术，以离散方式准确计算三维复杂地壳速度模型中的震源轨迹，将震源定位于震源轨迹交汇的密集点。将该方法应用于云南地区地震重定位，得到较高定位精度。
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| 关 键 词： | 交切法 三维复杂速度模型 到时残差 震源轨迹 最小走时树算法 |
Relocation of earthquakes in Yunnan Province from 2001 to 2010 employing a modified intersection method |
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| Zhou Jianchao,Zhao Aihua,He Zhengqin.Relocation of earthquakes in Yunnan Province from 2001 to 2010 employing a modified intersection method[J].Seismological and Geomagnetic Observation and Research,2017,38(6):30-33. |
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| Authors: | Zhou Jianchao Zhao Aihua He Zhengqin |
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| Institution: | Institute of Geophysics, China Earthquake Administration, Beijing Municipality 100081, China |
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| Abstract: | The intersection method is one of the traditional methods of earthquake location. However, the traditional method is deficient in location accuracy especially for hypocenter depth, because it is based on homogeneous or laterally homogeneous model. Thus, the key to improve the traditional intersection method is using the 3-D speed model that is more accord with practical model. So, we have modified it in the suitability for 3-D complex velocity models. The hypocenter is located at the point that the focal loci most intersect. We apply this method to Yunnan region, and get a high precision result. |
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| Keywords: | intersection method 3-D complex velocity model focal locus minimum travel-time tree algorithm |
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