2016年7月31日广西苍梧M_S5.4地震震源参数
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摘要
2016年7月31日广西苍梧县发生了M_S5. 4地震,该地震打破了华南沿海地区近17a的5级地震平静期,对华南沿海地区中强地震活动具有指示意义,然而不同研究机构和学者对此次地震震源深度的认识存在较大差异。基于此,文中使用CAP(Cut and Paste)方法和近震深度震相s PL进一步测定了本次地震的震源深度。结果显示,CAP方法测定的震源矩心深度为11km,s PL震相测定的地震深度为9km。结合震源机制解、等震线形态、余震分布和现场地震地质调查等资料分析认为,苍梧M_S5. 4地震是发生在上地壳的左旋走滑性质的地震。
On July 31 st,2016,an earthquake of M_S5. 4 occurred in Cangwu County,Guangxi Zhuang Autonomous Region,which is the first M_S≥5. 0 earthquake in coastal areas of southern China in the past 17 a. The moderate earthquake activities have come into a comparatively quiet period in coastal areas of southern China for decades,so the study about the Cangwu M_S5. 4 earthquake is very important. However,differernt research institutions and scholars have got different results for the focal depth of the Cangwu M_S5. 4 earthquake. For this reason,we further measured the focal depth by using CAP method and s PL phase method.s PL phase was first put forward by Chong in 2010. It is often observed between P and S wave of continental earthquakes with epicentral distance of about 30 km to 50 km. The energy of s PL phase is mainly concentrated on the radial component. Arrival time difference between s PL phase and direct P wave is insensitive to epicentral distancs,but increases almost linearly with the increase of focal depth. Based on these characteristics and advantages,s PL phase method is chosen to measure the focal depth of Cangwu M_S5. 4 earthquake in the paper.First of all,we selected the broadband waveform data through seismic stations distributed mainly in Guangxi and adjacent provinces from Data Management Centre of China National Seismic Network and Guangxi Earthquake Networks Center. And an appropriate velocity model of Cangwu area was constructed by the teleseismic receiver function method. Then,the focal mechanism and focal depth of Cangwu M_S5. 4 earthquake were determined by using the CAP( Cut and Paste) method. Next,we compared the synthetic waveforms simulated by F-K forward method of different focal depth models with the actual observed waveforms. According to the difference of arrival times between s PL and Pg phases,we finally obtained the focal depth of Cangwu earthquake. The results show that the focal depth is 11 km measured by CAP method and 9 km by s PL phase method. Based on the focal mechanism solution,isoseismal shapes,aftershocks distributions and investigation on spot,we conclude that the Cangwu M_S5. 4 earthquake is a left-lateral strike-slip earthquake which occurred in the upper crust. Our preliminary analysis considers that the seismogenic structure of Cangwu earthquake is a north-northwest branch fault,and the control fault of this earthquake is the Hejie-Xiaying Fault.
On July 31 st,2016,an earthquake of M_S5. 4 occurred in Cangwu County,Guangxi Zhuang Autonomous Region,which is the first M_S≥5. 0 earthquake in coastal areas of southern China in the past 17 a. The moderate earthquake activities have come into a comparatively quiet period in coastal areas of southern China for decades,so the study about the Cangwu M_S5. 4 earthquake is very important. However,differernt research institutions and scholars have got different results for the focal depth of the Cangwu M_S5. 4 earthquake. For this reason,we further measured the focal depth by using CAP method and s PL phase method.s PL phase was first put forward by Chong in 2010. It is often observed between P and S wave of continental earthquakes with epicentral distance of about 30 km to 50 km. The energy of s PL phase is mainly concentrated on the radial component. Arrival time difference between s PL phase and direct P wave is insensitive to epicentral distancs,but increases almost linearly with the increase of focal depth. Based on these characteristics and advantages,s PL phase method is chosen to measure the focal depth of Cangwu M_S5. 4 earthquake in the paper.First of all,we selected the broadband waveform data through seismic stations distributed mainly in Guangxi and adjacent provinces from Data Management Centre of China National Seismic Network and Guangxi Earthquake Networks Center. And an appropriate velocity model of Cangwu area was constructed by the teleseismic receiver function method. Then,the focal mechanism and focal depth of Cangwu M_S5. 4 earthquake were determined by using the CAP( Cut and Paste) method. Next,we compared the synthetic waveforms simulated by F-K forward method of different focal depth models with the actual observed waveforms. According to the difference of arrival times between s PL and Pg phases,we finally obtained the focal depth of Cangwu earthquake. The results show that the focal depth is 11 km measured by CAP method and 9 km by s PL phase method. Based on the focal mechanism solution,isoseismal shapes,aftershocks distributions and investigation on spot,we conclude that the Cangwu M_S5. 4 earthquake is a left-lateral strike-slip earthquake which occurred in the upper crust. Our preliminary analysis considers that the seismogenic structure of Cangwu earthquake is a north-northwest branch fault,and the control fault of this earthquake is the Hejie-Xiaying Fault.
引文
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范玉兰,林纪曾,胡瑞贺,等.1990.华南地区近震走时表的研制[J].华南地震,10(2):1-16.FAN Yu-lan,LIN Ji-zeng,HU Rui-he,et al.1990.The development of travel timetable for near earthquake in South China[J].South China Seismological Journal,10(2):1-16(in Chinese).
广西壮族自治区地质局.1965.贺县幅地质图[CM].北京:地质出版社.Geological Bureau of Guangxi Zhuang Autonomous Region.1965.Geological Map of Hexian County[CM].Geological Publishing House,Beijing(in Chinese).
刘启元,陈九辉,李顺成,等.2000.新疆伽师强震群区三维地壳上地幔S波速度结构及其地震成因的探讨[J].地球物理学报,43(3):356-364.LIU Qi-yuan,CHEN Jiu-hui,LI Shun-cheng,et al.2000.Passive seismic experiment in Xingjiang-Jiashi strong earthquake region and discussion on its seismic genesis[J].Chinese Journal of Geophysics,43(3):356-364(in Chinese).
刘启元,Kind R,李顺成.1997.中国数字地震台网的接收函数及其非线性反演[J].地球物理学报,40(3):356-367.LIU Qi-yuan,Kind R,LI Shun-cheng.1997.The receiver functions at the station of the Chinese Digital Seismic Network(CDSN)and their nonlinear inversions[J].Chinese Journal of Geophysics,40(3):356-367(in Chinese).
莫佩婵,李莎,郭培兰,等.2018.2016年7月31日广西苍梧5.4级地震测震学异常研究[J].华南地震,38(2):47-56.MO Pei-chan,LI Sha,GUO Pei-lan,et al.2018.Research on seismological anomaly of the Cangwu MS5.4 earthquake in Guangxi,on July 31th,2016[J].South China Journal of Seismology,38(2):47-56(in Chinese).
孙茁,吴建平,房立华,等.2014.利用s Pn震相测定芦山MS7.0地震余震的震源深度[J].地球物理学报,57(2):430-440.SUN Zhuo,WU Jian-ping,FANG Li-hua,et al.2014.Focal depth determination of aftershocks of Lushan MS7.0earthquake from s Pn phase[J].Chinese Journal of Geophysics,57(2):430-440(in Chinese).
汪素云,Ni J,马宗晋,等.1991.华北强震断层面解和震源深度特征[J].地球物理学报,34(1):42-54.WANG Su-yun,Ni J,MA Zong-jin,et al.1991.The characteristics of fault plane solutions and focal depths of strong earthquakes in North China[J].Chinese Journal of Geophysics,34(1):42-54(in Chinese).
韦生吉,倪四道,崇加军,等.2009.2003年8月16日赤峰地震:一个可能发生在下地壳的地震?[J].地球物理学报,52(1):111-119.WEI Sheng-ji,NI Si-dao,CHONG Jia-jun,et al.2009.The 16 August 2003 Chifeng earthquake:Is it a lower crust earthquake?[J].Chinese Journal of Geophysics,52(1):111-119(in Chinese).
谢祖军,郑勇,倪四道,等.2012.2011年1月19日安庆ML4.8地震的震源机制解和深度研究[J].地球物理学报,55(5):1624-1634.XIE Zu-jun,ZHENG Yong,NI Si-dao,et al.2012.Focal mechanism and focal depth of the 19 January 2011 Anqing earthquake[J].Chinese Journal of Geophysics,55(5):1624-1634(in Chinese).
徐晓枫,王蕙琳,胡久常,等.2017.采用CAP方法反演2016年广西苍梧MS5.4地震震源机制解[J].地震地磁观测与研究,38(3):8-12.XU Xiao-feng,WANG Hui-lin,HU Jiu-chang,et al.2017.Inversion of focal mechanism solution of Cangwu MS5.4earthquake in Guangxi using CAP method[J].Seismological and Geomagnetic Observation and Research,38(3):8-12(in Chinese).
易桂喜,龙锋,梁明剑,等.2017a.2017年8月8日九寨沟M7.0地震及余震震源机制解与发震构造分析[J].地球物理学报,60(10):4083-4097.YI Gui-xi,LONG Feng,LIANG Ming-jian,et al.2017a.Focal mechanism solution and seismogenic structure of the 8August 2017 M7.0 Jiuzhaigou earthquake and its aftershocks,northern Sichuan[J].Chinese Journal of Geophysics,60(10):4083-4097(in Chinese).
易桂喜,龙锋,梁明剑,等.2017b.2016年9月23日四川理塘M4.9和M5.1地震发震构造分析[J].地震地质,39(5):949-963.doi:10.3936/j.issn.0253-4967.2017.05.006.YI Gui-xi,LONG Feng,LIANG Ming-jian,et al.2017b.Seismogenic structure of the M4.9 and M5.1 Litang earthquakes on 23 September 2016 in southwestern China[J].Seismology and Geology,39(5):949-963(in Chinese).
詹小艳,朱升初,王恒知,等.2014.s PL震相在江苏高邮M4.9地震震源深度测定中的应用[J].地球物理学进展,29(4):1609-1614.ZHAN Xiao-yan,ZHU Sheng-chu,WANG Heng-zhi,et al.2014.The application of the s PL phase in Gaoyou M4.9earthquake in determination of focal depth[J].Progress in Geophysics,29(4):1609-1614(in Chinese).
张国民,汪素云,李丽,等.2002.中国大陆地震震源深度及其构造含义[J].科学通报,47(9):663-668.ZHANG Guo-min,WANG Su-yun,LI Li,et al.2002.Focal depth of continental earthquakes in China and its seismotectonic implication[J].Chinese Science Bulletin,47(9):663-670(in Chinese).
张瑞青,吴庆举.2008.四川攀枝花2008年8月31日MS5.6地震震源深度的确定[J].国际地震动态,(12):1-5.ZHANG Rui-qing,WU Qing-ju.2008.Focal depth for an earthquake(MS5.6)on August 31,2008 in Panzhihua of Sichuan Province[J].Recent Developments in World Seismology,(12):1-5(in Chinese).
郑建常,林眉,王鹏,等.2015.CAP方法反演震源机制的误差分析:以胶东半岛2次显著中等地震为例[J].地球物理学报,58(2):453-462.ZHENG Jian-chang,LIN Mei,WANG Peng,et al.2005.Error analysis for focal mechanisms from CAP method inversion:An example of 2 moderate earthquakes in Jiaodong Peninsula[J].Chinese Journal of Geophysics,58(2):453-462(in Chinese).
郑秀芬,欧阳飚,张东宁,等.2009.“国家数字测震台网数据备份中心”技术系统建设及其对汶川大地震研究的数据支撑[J].地球物理学报,52(5):1412-1417.ZHENG Xiu-fen,OUYANG Biao,ZHANG Dong-ning,et al.2009.Technical system construction of Data Backup Centre for China Seismograph Network and the data support to researches on the Wenchuan earthquake[J].Chinese Journal of Geophysics,52(5):1412-1417(in Chinese).
郑勇,谢祖军.2017.地震震源深度定位研究的现状与展望[J].地震研究,40(2):167-175.ZHENG Yong,XIE Zu-jun.2017.Present status and prospect of earthquake focal depth locating[J].Journal of Seismological Research,40(2):167-175(in Chinese).
周军学,聂高众,谭劲先,等.2017.2016年7月31日广西苍梧5.4级地震灾害特征分析[J].地震地质,39(4):780-792.doi:10.3936/j.issn.0253-4967.2017.04.012.ZHOU Jun-xue,NIE Gao-zhong,TAN Jin-xian,et al.2017.Analysis on disaster characteristics of the MS5.4 Cangwu,Guangxi earthquake,July,31th,2017[J].Seismology and Geology,39(4):780-792(in Chinese).
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