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新疆于田MS7.3地震主震精定位研究
詹小艳1) 宋秀青2) 陈向军3) 王俊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来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,360o等方位均匀选取台站,平均每隔约15o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1.0o范围内发生的历史地震资料为基础,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进行方位角测定,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36.197oN、82.467oE,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:
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基金项目:
Study on the Precise Location of the Xinjiang Yutian MS 7. 3 Earthquake
Zhan Xiaoyan,Song Xiuqing,Chen Xiangjun,Wang Jun,Miao Fajun,Liu Shuangqing,Zhu Yuanqing
Abstract:
The seismic waveform of the Yutian MS 7. 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 location 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 location: (1) We selected seismic stations equally located around the epicenter of the MS 7. 3 earthquake with an average interval of about 15 degrees in the initial location. (2) The recording waveforms of Yutian seismic station were rotated to the radial and tangential directions to precisely obtain the arrival time of S-waves to determine the epicentral distance. (3) The velocity model was used in the determination of location 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 waveform records of the Hotan seismic array,the method of waveform beaming was used to determine the azimuths and perform the correction of the epicenter location with these azimuths. (5) The deterministic method was used to measure the source depth. Finally,it is concluded that the Yutian MS 7. 3 main shock hypocenter location is 36. 197°N, 82. 467°E,focal depth 12km and original time 17:19:48. 2 p. m. February 12,2014.
Key words:  Hypocentral location  Digital seismic network  Seismic array