2017年9月4日河北临城M_L4.4地震震源深度测定
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摘要
震源深度是地震定位中的重要参数之一。对于一个地震,sPn与Pn震相到时差是一个常量,与震中距无关,只与震源深度和地壳模型有关。基于该理论,以河北数字台网数据为基础,识别sPn震相和Pn震相,计算2017年9月4日河北临城M_L4.4地震震源深度,结果为6.86km。双差定位法是目前确定震源深度比较精确的方法,双差定位得到的震源深度为7.01km。双差定位法所用数据量比较大,计算过程繁杂。利用sPn与Pn到时差计算震源深度的结果与双差定位法结果接近,计算快速、简单,所需数据量小。因此,将该方法应用到实际工作中,可以快速、准确地测定近震震源深度。
Focal depth is one of the important parameters in seismic location.For an earthquake,the arrival time difference between sPn and Pn is a constant,independent of epicenter distance,and only related to focal depth and crustal model.Based on this method and the data recorded by the Hebei digital seismic network,the sPn and Pn phases are identified,and the focal depth of the M_L4.4 Lincheng earthquake on September 4,2017 is calculated,with the result is 6.86 km.The double-difference location method is a more accurate method to determine the focal depth at present,and the focal depth obtained by the double-difference location is 7.01 km.However,the data used in this double-difference location method is rather large and the calculation process is complicated.Considering that the focal depth by using sPn-Pn arrival time difference is close to that of double-difference location,the calculation is fast and simple,and the amount of data needed is small,we think that this method can be applied to practical work to determine the focal depth of near earthquakes quickly and accurately.
Focal depth is one of the important parameters in seismic location.For an earthquake,the arrival time difference between sPn and Pn is a constant,independent of epicenter distance,and only related to focal depth and crustal model.Based on this method and the data recorded by the Hebei digital seismic network,the sPn and Pn phases are identified,and the focal depth of the M_L4.4 Lincheng earthquake on September 4,2017 is calculated,with the result is 6.86 km.The double-difference location method is a more accurate method to determine the focal depth at present,and the focal depth obtained by the double-difference location is 7.01 km.However,the data used in this double-difference location method is rather large and the calculation process is complicated.Considering that the focal depth by using sPn-Pn arrival time difference is close to that of double-difference location,the calculation is fast and simple,and the amount of data needed is small,we think that this method can be applied to practical work to determine the focal depth of near earthquakes quickly and accurately.
引文
[1]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.
[2]张正霞,刘康廷,吕睿.山西历史地震图纸档案服务社会科研新模式研究[J].山西地震,2018(4):53-56.
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[4]马莉,张玲,杨颖,等.Pn与sPn震相到时差计算震源深度的单台应用[J].华北地震科学,2011,29(1):57-62.
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[10]房立华,吴建平,王长在,等.2012年新疆新源MS6.6地震余震序列精定位研究[J].中国科学:地球科学,2013(12):1929-1933.
[11]张小涛,吕坚,马广庆,等.双差地震定位法在邯郸-邢台地区地震精确定位中的初步应用[J].地震研究,2008(1):37-41.
[12]袁乃荣,孔韩东,郭祥云.用P波初动法测定2014年11月22日康定6.3级地震的震源机制[J].中国地震,2018,34(1):83-92.
[13]王晓山.华北平原块体地壳应力场与强震震源断层参数的研究[D].北京:中国地震局地球物理研究所,2017:42-43.
[2]张正霞,刘康廷,吕睿.山西历史地震图纸档案服务社会科研新模式研究[J].山西地震,2018(4):53-56.
[3]高原,周蕙兰,郑斯华,等.测定震源深度的意义的初步探讨[J].中国地震,1997,13(4):321-329.
[4]马莉,张玲,杨颖,等.Pn与sPn震相到时差计算震源深度的单台应用[J].华北地震科学,2011,29(1):57-62.
[5]罗丽,肖孟仁,项月文,等.利用sPn震相计算九江-瑞昌地区地震的震源深度[J].大地测量与地球动力学,2012,32(S1):34-36.
[6]王登伟.用sPn与Pn波走时差测定近震震源深度的方法[J].地震,2011,31(1):12-19.
[7]葛粲,郑勇,熊熊.华北地区地壳厚度与泊松比研究[J].地球物理学报,2011,54(10):2538-2548.
[8]蔡玲玲,常亮,毛国良,等.利用河北台网sPn震相计算近震震源深度的初步研究[J].华北地震科学,2012,30(2):60-63.
[9]任克新,邹立晔,刘瑞丰,等.用sPn计算内蒙地震的震源深度[J].地震地磁观测与研究,2004,25(3):24-31.
[10]房立华,吴建平,王长在,等.2012年新疆新源MS6.6地震余震序列精定位研究[J].中国科学:地球科学,2013(12):1929-1933.
[11]张小涛,吕坚,马广庆,等.双差地震定位法在邯郸-邢台地区地震精确定位中的初步应用[J].地震研究,2008(1):37-41.
[12]袁乃荣,孔韩东,郭祥云.用P波初动法测定2014年11月22日康定6.3级地震的震源机制[J].中国地震,2018,34(1):83-92.
[13]王晓山.华北平原块体地壳应力场与强震震源断层参数的研究[D].北京:中国地震局地球物理研究所,2017:42-43.