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新疆于田MS 7. 3 地震主震精定位研究
王俊1, 宋秀青2, 陈向军3, 詹小艳1, 缪发军1, 刘双庆4, 朱元清2
1.江苏省地震局,南京市玄武区卫岗3 号210014;2.上海市地震局,上海200062;3.新疆维吾尔自治区地震局,乌鲁木齐830011;4.天津市地震局,天津300201
摘要:
新疆、青海、西藏数字地震台网和新疆和田台阵都十分清晰、完整地记录到2014 年2 月12 日新疆于田MS7. 3 地震的波形,故采用区域地震台网和地震台阵联合定位的方法精确测定该地震的震源位置。具体定位时采用了以下技术:①根据MS7. 3 地震震中的位置,360°等方位均匀选取台站,平均每隔约15°选取1 个台站参与初始定位;②将于田台的记录波形旋转至径向和切向上精确测定S 波的到时,并以此控制震中距;③测定震中位置时采用的速度模型,是以震源为中心、半径约为1. 0°范围内发生的历史地震资料为基础,经重新拟合后获得的速度模型;④利用和田地震台阵记录的主震波形资料,经波形聚束方法处理后测定方位角,并以此方位角修正震中位置;⑤采用确定性方法测定震源深度。最终得到新疆于田MS7. 3 地震主震的震中位置为36. 197° N、82. 467° E,震源深度为12km,发震时刻为2014 年2 月12 日17:19:48. 2。
关键词:  震源位置  数字地震台网  地震台阵
DOI:
分类号:
基金项目:中国地震局监测预报司专项(1309010)和中国地震局测震台网青年骨干专项(20140330、20130201)共同资助
Study on precision positioning the Yutian, Xinjiang MS7. 3 earthquake
Wang Jun1, Song Xiuqing2, Chen Xiangjun3, Zhan Xiaoyan1, Miao Fajun1, Liu Shuangqing4, Zhu Yuanqing2
1.Earthquake Administration of Jiangsu Province,Nanjing,210014,China;2.Earthquake Administration of Shanghai Municipality,Shanghai 200062,China;3.Earthquake Administration of Xinjiang Uygur Autonomous Region,Urumqi 830011,China;4.Earthquake Administration of Tianjin Municipality,Tianjin 300201,China
Abstract:
The seismic waveform of Yutian MS7. 3 earthquake,Xinjiang on February 12,2014 was recorded clearly and completely by the Digital Seismic Networks of Xinjiang,Qinghai,Tibet, and Xinjiang Hotan array,so the method of joint positioning by regional seismic network and seismic array can be used to accurately determine the earthquake source location. The following technologies were used in the process of positioning: (1) We selected seismic stations equally located around epicenter of MS7. 3 earthquake with average intervals of about 15 degrees in the initial positioning. (2) The recording waveform of Yutian seismic station was rotated to the radial and tangential to precisely obtain the arrival time of S-wave to control the epicentral distance. (3) Velocity model was used in the determination of the epicenter,based on the historical records of earthquakes in the area within a radius of 1. 0° from the source as the center,and the velocity model is obtained after re-fitting and calibration. (4) Based on the Hotan seismic array recording waveform,the method of waveform beaming for the determination of the azimuth is used,and the epicenter location was determined with this azimuth. (5) The deterministic method was used to measure the source depth. Finally,it is concluded that the Yutian MS7. 3 main shock hypocenter location was 36. 197°N,82. 467°E,focal depth of 12km,original time of February 12,2014 (17:19:48. 2pm).
Key words:  Earthquake location  Digital seismic network  Seismic array