新疆北天山地区M_S≥2.0地震震源参数的重新测定
|
摘要
基于新疆32个测震台站记录到的28701条P波和S波震相到时数据,利用双差地震定位法重新测定新疆北天山地区(42.5°~45°N,82°~89°E)1988年4月至2003年6月间发生的1348次MS≥2.0地震的震源位置。为尽量得到全部地震的重新定位结果,本文结合双差地震定位法对资料的要求和所用资料情况,添加了437次1.5≤MS<2.0的地震震相到时数据参与定位计算。重新定位后得到了1253次MS≥2.0地震的重新定位结果,占全部MS≥2.0地震的93%,其中,MS≥3.0的地震全部得到了重新定位结果,并对没有得到重新定位结果的95次2.0≤MS<3.0地震的原因进行了分析。得到重新定位结果的1253次地震的均方根残差的平均值由重新定位前的0.83s降到0.14s,震源位置的测定误差(2倍标准偏差)在E-W方向平均为0.993km,在N-S方向上平均为1.10km,垂直方向平均为1.33km。分析重新定位结果得出,重新定位地震的震源深度较定位前有明显收敛,集中分布在5~35km,94.3%的地震震源深度分布在5~35km,68.2%的地震震源深度分布在10~25km,地震的平均震源深度为19km。
We applieded double different earthquake relocation algorithm to 1348 M_S≥2.0 earthquakes occurred in the northern Tianshan region,Xinjiang,from April 1988 to June 2003,using total of 28701 P-and S-wave arrive time data recorded by 32 seismic stations in Xinjiang.Aiming to obtain most of these M_S≥2.0 earthquakes relocations,and considering the requirement of the DD method and the condition of data,we added travel time data of another 437 events with 1.5≤M_S<2.0.Finally,we obtained 1253 of M_S≥2.0 earthquake relocations,which accounts for 93% of all the 1348 M_S≥2.0 events and includes all the M_S≥3.0 events.The reason of 95 events with 2.0≤M_S<3.0 being deleted during relocation was analyzed in the paper.After relocation,the RMS residual decreased from 0.83s to 0.14s,the average error is 0.993km in E-W direction,1.10km in N-S direction,and 1.33km in vertical direciton.The hypocenter depth are more convergent than before and distributed from 5 km to 35km,with 94% being from 5km to 35km,68.2% from 10km to 25km.The average hypoecenter depth is 19km.
We applieded double different earthquake relocation algorithm to 1348 M_S≥2.0 earthquakes occurred in the northern Tianshan region,Xinjiang,from April 1988 to June 2003,using total of 28701 P-and S-wave arrive time data recorded by 32 seismic stations in Xinjiang.Aiming to obtain most of these M_S≥2.0 earthquakes relocations,and considering the requirement of the DD method and the condition of data,we added travel time data of another 437 events with 1.5≤M_S<2.0.Finally,we obtained 1253 of M_S≥2.0 earthquake relocations,which accounts for 93% of all the 1348 M_S≥2.0 events and includes all the M_S≥3.0 events.The reason of 95 events with 2.0≤M_S<3.0 being deleted during relocation was analyzed in the paper.After relocation,the RMS residual decreased from 0.83s to 0.14s,the average error is 0.993km in E-W direction,1.10km in N-S direction,and 1.33km in vertical direciton.The hypocenter depth are more convergent than before and distributed from 5 km to 35km,with 94% being from 5km to 35km,68.2% from 10km to 25km.The average hypoecenter depth is 19km.
引文
曲延军、李志海,2006,北天山地区部分中强震前小震震源深度变化特征,地震,26(4),76～81。
李强、刘福田,1991,一种横向不均匀介质中地震基本参数的测定方法,中国地震,7(3),54～63。
马秀芳,1982,用相对定位法测定1973年安徽霍山震群的震源位置,地震研究,5(1),99～113。
马宗晋,薛峰,1983,中国大陆地震深度分布与“易震层”初探,地震科学研究,3(3),43～46。
荣代潞、李亚荣,2004,基于“双差法”地震精确定位研究2002年12月14日玉门5.9级地震的发震断层和发震机制,西北地震学报,26(3),223～227。
邵学钟、张学茹、范会吉等,1996,天山造山带地壳结构与构造,地球物理学报,39(3),336～346。
田、陈晓非,2002,地震定位研究综述,地球物理学进展,17(1),147～155。
杨智娴、陈运泰、郑月军等,2003,双差地震定位法在我国中西部地区地震精确定位中的应用,中国科学,33(增刊),129～134。
赵燕来、孙若昧、梅世蓉,1993,渤海地区地震参数的修定,中国地震,9(2),129～137。
周仕勇、许忠淮、韩京等,1999,主地震定位法分析以及1997年新疆伽师强震群高精度定位,地震学报,21(3),258～265。
Waldhauser F,Ellsworth WL.2000,A double-difference earthquake location algorithm:method and application to the NorthernHayward Fault,California Bull.Seism.Soc.Am,90(6),1353～1368.
Yang Z X,2002,Accurate relocation of earthquake in the Central-Western China using the double difference earthquake locationalgorithm,EOS Trans Amer Geophys Union,83(22),65～66.
李强、刘福田,1991,一种横向不均匀介质中地震基本参数的测定方法,中国地震,7(3),54～63。
马秀芳,1982,用相对定位法测定1973年安徽霍山震群的震源位置,地震研究,5(1),99～113。
马宗晋,薛峰,1983,中国大陆地震深度分布与“易震层”初探,地震科学研究,3(3),43～46。
荣代潞、李亚荣,2004,基于“双差法”地震精确定位研究2002年12月14日玉门5.9级地震的发震断层和发震机制,西北地震学报,26(3),223～227。
邵学钟、张学茹、范会吉等,1996,天山造山带地壳结构与构造,地球物理学报,39(3),336～346。
田、陈晓非,2002,地震定位研究综述,地球物理学进展,17(1),147～155。
杨智娴、陈运泰、郑月军等,2003,双差地震定位法在我国中西部地区地震精确定位中的应用,中国科学,33(增刊),129～134。
赵燕来、孙若昧、梅世蓉,1993,渤海地区地震参数的修定,中国地震,9(2),129～137。
周仕勇、许忠淮、韩京等,1999,主地震定位法分析以及1997年新疆伽师强震群高精度定位,地震学报,21(3),258～265。
Waldhauser F,Ellsworth WL.2000,A double-difference earthquake location algorithm:method and application to the NorthernHayward Fault,California Bull.Seism.Soc.Am,90(6),1353～1368.
Yang Z X,2002,Accurate relocation of earthquake in the Central-Western China using the double difference earthquake locationalgorithm,EOS Trans Amer Geophys Union,83(22),65～66.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心