广西苍梧M_S5.4地震震源深度
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摘要
2016年7月31日广西苍梧发生的M_S5. 4地震是广西测震台网自建立以来所记录到的区域内最强地震。不同机构对于此次事件给出的震源深度结果相差较大,例如美国地质调查局(USGS)地震目录显示其深度为24. 5km,而全球矩心矩张量研究中心(Global CMT)测定的深度为15. 6km。为了进一步准确确定广西苍梧地震的震源深度,文中基于区域速度模型,首先利用走时残差全局搜索法初步得到此次地震震源深度及误差范围,然后使用CAP(Cut and Paste)方法反演苍梧地震震源机制,在此基础上,采用Rayleigh波振幅谱和s PL震相方法进一步约束了此次地震的震源深度。研究结果显示:利用走时残差全局搜索法获得的苍梧M_S5. 4地震震源深度及误差范围为(13±3) km,CAP方法反演的深度为10km,Rayleigh波振幅谱测定深度结果为9～10km,s PL震相测定深度结果为10km,最终确定广西苍梧M_S5. 4地震的震源深度约10km,这表明此次事件仍为发生于上地壳的地震。本文结果同时表明,USGS地震目录在研究区的震源深度精度有待提高。
On July 31th,2016,a magnitude 5. 4 earthquake struck Cangwu Country,Guangxi Zhuang Autonomous Region,it was the largest earthquake recorded by Guangxi Seismological Network since it set up. The number of people affected by the earthquake had reached 20 000,and the direct economic losses caused by the earthquake were nearly 100 million Yuan.After the earthquake,USGS provided a global earthquake catalog showing that the focal depth of Cangwu earthquake was about 24. 5 km. However,the result given by the Global Centroid Moment Tensor showed the focal depth of this earthquake was 15. 6 km. However,the result obtained by Xu Xiaofeng et al. using CAP method was 5. 1 km. It was clear that the focal depths of Cangwu earthquake given by different institutions were quite different from each other. However,accurate focal depth of the earthquake has important significance for exploring the tectonic mechanism near the epicenter,so it is necessary to further determine the more accurate depth of the Cangwu earthquake.In order to further accurately determine the focal depth of Cangwu earthquake,we used the global search method for travel-time residual to calculate the focal depth of this earthquake and its error range,based on the regional velocity model,which is a one-dimensional velocity model of the Xianggui tectonic belt produced by the comprehensive geophysical profile. Then,we inverted the focal mechanism of this earthquake with the CAP method. Based on this,the focal depth of Cangwu M_S5. 4 earthquake was further determined by the method of the Rayleigh surface wave amplitude spectrum and the sPL phase,respectively.Computed results reveal that the focal depth of this earthquake and its error range from the traveltime residual global search method is about( 13± 3) km,the focal depth inverted by CAP method is about 10 km,the focal depth from sPL phase is about 10 km,and the focal depth from Rayleigh surface wave amplitude spectrum is about 9 ～ 10 km. Finally,we confirmed that the focal depth of Cangwu M_S5. 4 earthquake is about 10 km,which indicates that this earthquake still occurred in the upper crust. In the case of low network density,the sPL phase and Rayleigh wave amplitude spectrum recorded by only 1 or 2 broadband stations could be used to obtain more accurate focal depth.The focal depth's accuracy of Cangwu M_S5. 4 earthquake in the USGS global earthquake catalog has yet to be improved. In the future,we should consider the error of the source parameters when using the USGS global earthquake catalog for other related research.
On July 31th,2016,a magnitude 5. 4 earthquake struck Cangwu Country,Guangxi Zhuang Autonomous Region,it was the largest earthquake recorded by Guangxi Seismological Network since it set up. The number of people affected by the earthquake had reached 20 000,and the direct economic losses caused by the earthquake were nearly 100 million Yuan.After the earthquake,USGS provided a global earthquake catalog showing that the focal depth of Cangwu earthquake was about 24. 5 km. However,the result given by the Global Centroid Moment Tensor showed the focal depth of this earthquake was 15. 6 km. However,the result obtained by Xu Xiaofeng et al. using CAP method was 5. 1 km. It was clear that the focal depths of Cangwu earthquake given by different institutions were quite different from each other. However,accurate focal depth of the earthquake has important significance for exploring the tectonic mechanism near the epicenter,so it is necessary to further determine the more accurate depth of the Cangwu earthquake.In order to further accurately determine the focal depth of Cangwu earthquake,we used the global search method for travel-time residual to calculate the focal depth of this earthquake and its error range,based on the regional velocity model,which is a one-dimensional velocity model of the Xianggui tectonic belt produced by the comprehensive geophysical profile. Then,we inverted the focal mechanism of this earthquake with the CAP method. Based on this,the focal depth of Cangwu M_S5. 4 earthquake was further determined by the method of the Rayleigh surface wave amplitude spectrum and the sPL phase,respectively.Computed results reveal that the focal depth of this earthquake and its error range from the traveltime residual global search method is about( 13± 3) km,the focal depth inverted by CAP method is about 10 km,the focal depth from sPL phase is about 10 km,and the focal depth from Rayleigh surface wave amplitude spectrum is about 9 ～ 10 km. Finally,we confirmed that the focal depth of Cangwu M_S5. 4 earthquake is about 10 km,which indicates that this earthquake still occurred in the upper crust. In the case of low network density,the sPL phase and Rayleigh wave amplitude spectrum recorded by only 1 or 2 broadband stations could be used to obtain more accurate focal depth.The focal depth's accuracy of Cangwu M_S5. 4 earthquake in the USGS global earthquake catalog has yet to be improved. In the future,we should consider the error of the source parameters when using the USGS global earthquake catalog for other related research.
引文
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吕坚,曾文敬,谢祖军,等.2012.2011年9月10日瑞昌-阳新4.6级地震的震源破裂特征与区域强震危险性[J].地球物理学报,55(11):3625-3633.doi:10.6038/j.issn.0001-5733.2012.11.011.Lü Jian,ZENG Wen-jing,XIE Zu-jun,et al.2012.Rupture characteristics of the MS4.6 Ruichang-Yangxin earthquake of Sep.10,2011 and the strong earthquake risk in the region[J].Chinese Journal of Geophysics,55(11):3625-3633(in Chinese).
吕坚,郑秀芬,肖健,等.2013.2012年9月7日云南彝良MS5.7、MS5.6地震震源破裂特征与发震构造研究[J].地球物理学报,56(8):2645-2654.doi:10.6038/cjg20130814.Lü Jian,ZHENG Xiu-fen,XIAO Jian,et al.2013.Rupture characteristics and seismogenic structures of the MS5.7and MS5.6 Yiliang earthquakes of Sep.7,2012[J].Chinese Journal of Geophysics,56(8):2645-2654(in Chinese).
孟庆君.2013.CAP方法和深度震相确定地震震源参数研究[D].合肥:中国科学技术大学.MENG Qing-jun.2013.Study on seismic source parameters determined by CAP method and depth phase[D].University of Science and Technology of China,Hefei(in Chinese).
石耀霖,朱守彪.2003.中国大陆震源机制深度变化反映的地壳-地幔流变特征[J].地球物理学报,46(3):359-365.SHI Yao-lin,ZHU Shou-biao.2003.Contrast of rheology in the crust and mantle near Moho revealed by depth variation of earthquake mechanism in continental China[J].Chinese Journal of Geophysics,46(3):359-365(in Chinese).
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