| 模拟退火算法在江苏及邻区地震定位中的应用 |
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| 引用本文： | 于悦颖,李正楷,周昱辰,杨驰.模拟退火算法在江苏及邻区地震定位中的应用[J].地震地磁观测与研究,2021,42(4):51-56. |
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| 作者姓名： | 于悦颖 李正楷 周昱辰 杨驰 |
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| 作者单位： | 中国南京210014 江苏省地震局 |
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| 基金项目： | 中国地震局监测、预报、科研三结合课题（项目编号：3JH-202001028）；江苏省地震局青年科学基金（项目编号：201909） |
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| 摘 要： | 使用模拟退火算法，以2019年4月6日江苏溧水ML 3.3地震为典型震例，进行地震定位反演试算，确定适用于江苏及邻区地震定位的最佳初始温度、降温策略和扰动函数。设置初始温度为25，降温策略为T = 0.96T，选用效率较高的局部收敛加强型方法产生随机模型，对2019年江苏及周边地区105次ML≥1.8地震进行重新定位，结果表明，76%的事件震中经、纬度定位误差绝对值在0.1°以内，但深度定位误差较大。鉴于该算法对P波到时信息及地震台站空间分布的依赖性，认为模拟退火算法在江苏及邻区陆地地震定位中效果较好，对于海域地震，则定位误差较大。
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| 关 键 词： | 模拟退火算法 地震定位 反演 应用 |
Application of Simulated Annealing Algorithm in seismic location in Jiangsu and adjacent areas |
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| YU Yueying,LI Zhengkai,ZHOU Yuchen,YANG Chi.Application of Simulated Annealing Algorithm in seismic location in Jiangsu and adjacent areas[J].Seismological and Geomagnetic Observation and Research,2021,42(4):51-56. |
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| Authors: | YU Yueying LI Zhengkai ZHOU Yuchen YANG Chi |
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| Institution: | Jiangsu Earthquake Agency, Nanjing 210014, China |
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| Abstract: | We took the Lishui ML 3.3 earthquake on April 6, 2019, in Jiangsu Province, as a typical case to determine the optimal initial temperature, cooling schedule, and perturbation function of the Simulated Annealing Algorithm for seismic location in Jiangsu and its adjacent areas. Then, we set the initial temperature to 25, the cooling schedule to T = 0.96T, and chose a local convergence method which is more efficient in generating random models to relocate 105 earthquakes with ML≥1.8 occurred in Jiangsu province and surrounding areas in 2019. The results show that the absolute longitude and latitude location errors of 76% events are within 0.1°, but the depth location errors are large. It is considered that the Simulated Annealing Algorithm is more suitable for the continental seismic location, and the errors are significant for earthquakes in the sea because of the dependence on P-wave arrival time and station spatial distribution. |
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| Keywords: | Simulated Annealing Algorithm earthquake location inversion application |
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