基于近台数据的2017-06巴东M4.3地震序列震源深度研究
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摘要
利用三峡遥测地震台网和流动加密台资料计算2017-06巴东M4.3地震序列震源深度并分析其深度误差。结果显示,序列震源深度主要分布在3~5km;流动加密台观测明显改善了震源深度测定精度,其震源深度误差由平均1.8km减少到1.1km。研究认为,直达波法测定三峡遥测台网(特别是布置流动加密台后)网内地震可获得较高精度的震源深度。
We calculate the focal depth of the Badong M4.3 earthquake sequence and analyze the depth error using the data from the Three Gorges telemetry network and the mobile station.The results show that the sequence of the focal depth is mainly distributed in the 3-5 km;mobile station observation can obviously improve the accuracy of the sequence determination of focal depth,and focal depth error is reduced from 1.8 km to 1.1 km.It is considered that the focal depth in the Three Gorges telemetry network(especially after setting up the mobile station)can be determined by direct wave method.
We calculate the focal depth of the Badong M4.3 earthquake sequence and analyze the depth error using the data from the Three Gorges telemetry network and the mobile station.The results show that the sequence of the focal depth is mainly distributed in the 3-5 km;mobile station observation can obviously improve the accuracy of the sequence determination of focal depth,and focal depth error is reduced from 1.8 km to 1.1 km.It is considered that the focal depth in the Three Gorges telemetry network(especially after setting up the mobile station)can be determined by direct wave method.
引文
[1]王秋良,张丽芬,廖武林,等.三峡库首区断裂构造与地震活动特征[J].大地测量与地球动力学,2013,33(5):29-33(Wang Qiuliang,Zhang Lifen,Liao Wulin,et al.Fault Tectonics and Seismic Activity Characteristics of Three Gorges Reservoir[J].Journal of Geodesy and Geodynamics,2013,33(5):29-33)
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[12]陈学波,陈步云,张四维,等.长江三峡工程坝区及外围深部构造特征研究[M].北京:地震出版社,1994(Chen Xuebo,Chen Buyun,Zhang Siwei,et al.The Research on Characteristics of the Deep Tectonics in Three Gorges and Nearby Area[M].Beijing:Seismological Press,1994)
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[14]胡新亮,刁桂苓,高景春,等.华北、西南一些地区地震发生在地壳浅部的证据[J].地震学报,2001,23(4):427-435(Hu Xinliang,Diao Guiling,Gao Jingchun,et al.Some Evidences for Earthquake Occurrence in the Shallow Crust in Some Area of North China and Southwest China[J].Acta Seismologica Sinica,2001,23(4):427-435)
[15]Schweitzer J.HYPOSAT:An Enhanced Routine to Locate Seismic Events[J].Pure Appl Geophys,2001,158(12):277-289
[16]傅淑芳,刘宝诚.地震学教程[M].北京:地震出版社,1980(Fu Shufang,Liu Baocheng.A Course in Seismology[M],Beijing:Seismologincal Press,1980)
[17]湖北省地震局.巴东MS4.3地震现场考察报告[R].武汉,2017(Hubei Earthquake Agency.The Field Investigation Report of the MS4.3Earthquake in Badong Area[R].Wuhan,2017)
[18]张丽芬,廖武林,李井冈,等.2013年12月16日巴东M5.1地震序列及发震构造分析[J].地震地质,2016,38(3):747-759(Zhang Lifen,Liao Wulin,Li Jinggang,et al.Analysis on the 2013 Badong M5.1 Earthquake Sequence and the Seismogenic Structure[J].Seismology and Geology,2016,38(3):747-759)
[2]廖武林,张丽芬,姚运生.三峡水库地震活动特征研究[J].地震地质,2009,31(4):707-714(Liao Wulin,Zhang Lifen,Yao Yunsheng.Characteristics of Seismicity in Three Gorges Reservoir Area[J].Seismology and Geology,2009,31(4):707-714)
[3]陈德基,汪雍熙,曾新平.三峡工程水库诱发地震问题研究[J].岩石力学与工程学报,2008,27(8):1 513-1 524(Chen Deji,Wang Yongxi,Zeng Xinping.A Study of ReservoirInduced Earthquake of Three Gorges Project[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(8):1 513-1 524)
[4]郑勇,谢祖军.地震震源深度定位研究的现状与展望[J].地震研究,2017,40(2):167-175(Zheng Yong,Xie Zujun.Present Status and Prospect of Earthquake Focal Depth Locating[J].Journal of Seismological Research,2017,40(2):167-175)
[5]高原,周蕙兰,郑斯华,等.测定震源深度的意义的初步讨论[J].中国地震,1997,12(4):13-21(Gao Yuan,Zhou Huilan,Zheng Sihua,et al.Preliminary Discussion on Implication of Determination on Source Depth of Earthquake[J].Earthquake Research in China,1997,12(4):13-21)
[6]张晁军,张晓东,苗春兰,等.近震震源深度测定精度的理论误差分析[J].中国地震,2010,26(2):156-163(Zhang Chaojun,Zhang Xiaodong,Miao Chunlan,et al.The Analysis of the Theoretical Error of the Accuracy of Measuring the Focal Depth of Near earthquake[J].Earthquake Research in China,2010,26(2):156-163)
[7]王登伟.利用直达P波测定地方震震源深度的探讨[J].地震地磁观测与研究,2010,31(5):45-48(Wang Dengwei.Discussion on the Measurement of the Depth of Local Earthquake Sources Using Direct P Wave[J].Seismological and Geomagnetic Observation and Research,2010,31(5):45-48)
[8]朱元清,石耀霖,李平.一种确定地震深度的新方法[J].地震地磁观测与研究,1990,11(2):4-12(Zhu Yuanqing,Shi Yaolin,Li Ping.A New Method to Determine Focal Depth[J].Seismological and Geomagnetic Observation and Research,1990,11(2):4-12)
[9]Stein S,Wiens D A.Depth Determination for Shallow Teleseismic Earthquakes:Methods and Results[J].Rev Geophys,1986,24(4),806-832
[10]罗艳,曾祥方,倪四道.震源深度测定方法研究进展[J].地球物理学进展,2013,28(5):2 309-2 321(Luo Yan,Zeng Xiangfang,Ni Sidao.Progress on the Determination of Focal Depth[J].Progress in Geophysics,2013,28(50):2 309-2 321)
[11]崇家军,倪四道,曾祥方.sPL,一个近距离确定震源深度的震相[J].地球物理学报,2010,53(11):2 620-2 630(Chong Jiajun,Ni Sidao,Zeng Xiangfang.sPL,an Effective Seismic Phase for Determining Focal Depth at Near Distance[J].Chinese Journal of Geophysics,2010,53(1):2 620-2 630)
[12]陈学波,陈步云,张四维,等.长江三峡工程坝区及外围深部构造特征研究[M].北京:地震出版社,1994(Chen Xuebo,Chen Buyun,Zhang Siwei,et al.The Research on Characteristics of the Deep Tectonics in Three Gorges and Nearby Area[M].Beijing:Seismological Press,1994)
[13]赵旭,李强,蔡晋安.三峡库首区最小一维速度模型研究[J].大地测量与地球动力学,2007,27(专刊):1-7(Zhao Xu,Li Qiang,Cai Jin’an.On Minimum 1DVelocity Structure Model Applied in Three Gorges Reservoir Area[J].Geodesy and Geodynamics,2007,27(S):1-7)
[14]胡新亮,刁桂苓,高景春,等.华北、西南一些地区地震发生在地壳浅部的证据[J].地震学报,2001,23(4):427-435(Hu Xinliang,Diao Guiling,Gao Jingchun,et al.Some Evidences for Earthquake Occurrence in the Shallow Crust in Some Area of North China and Southwest China[J].Acta Seismologica Sinica,2001,23(4):427-435)
[15]Schweitzer J.HYPOSAT:An Enhanced Routine to Locate Seismic Events[J].Pure Appl Geophys,2001,158(12):277-289
[16]傅淑芳,刘宝诚.地震学教程[M].北京:地震出版社,1980(Fu Shufang,Liu Baocheng.A Course in Seismology[M],Beijing:Seismologincal Press,1980)
[17]湖北省地震局.巴东MS4.3地震现场考察报告[R].武汉,2017(Hubei Earthquake Agency.The Field Investigation Report of the MS4.3Earthquake in Badong Area[R].Wuhan,2017)
[18]张丽芬,廖武林,李井冈,等.2013年12月16日巴东M5.1地震序列及发震构造分析[J].地震地质,2016,38(3):747-759(Zhang Lifen,Liao Wulin,Li Jinggang,et al.Analysis on the 2013 Badong M5.1 Earthquake Sequence and the Seismogenic Structure[J].Seismology and Geology,2016,38(3):747-759)