2008年新疆乌恰M_S6.8地震和M_S6.3余震的重叠地震波形分析
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摘要
利用滤波、仿真和小波包变换3种方法对2008年新疆乌恰M_S6.8地震和M_S6.3余震的重叠地震波形进行处理,对比分析发现小波包变换对于识别地震重叠位置效果优于其他2种方法。用小波包变换拾取M_S6.3余震震相到时,分别用3种方法进行定位,对定位结果进行比较与讨论。分析得出在空隙角、速度模型和定位方法相同的条件下,定位结果更接近于美国地质调查局的结果。小波包变换是一种精确拾取重叠地震震相位置的有效方法。
Taking use of filtering,simulation and wavelet packet transform for Xinjiang Wuqia earthquake with M_S6. 8 and its aftershock with M_S6. 3,it can be found that wavelet packet method performed better than the other 2 methods in identifying overlap position. When wavelet packet transform picked up M_S6. 3 aftershock phase,these 3 methods were used to locate position which results are compared and discussed. Under the same condition of gap angle,velocity model and positioning method,it argued that results were similar to these of USGS. Wavelet packet transform was an effective method to accurately pick up position of overlapped seismic phase.
Taking use of filtering,simulation and wavelet packet transform for Xinjiang Wuqia earthquake with M_S6. 8 and its aftershock with M_S6. 3,it can be found that wavelet packet method performed better than the other 2 methods in identifying overlap position. When wavelet packet transform picked up M_S6. 3 aftershock phase,these 3 methods were used to locate position which results are compared and discussed. Under the same condition of gap angle,velocity model and positioning method,it argued that results were similar to these of USGS. Wavelet packet transform was an effective method to accurately pick up position of overlapped seismic phase.
引文
[1]杨文东,金星,李山有,等.地震定位研究及应用综述[J].地震工程与工程振动,2005,25(1):14-20.
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[6]谭毅培,曹井泉,刘文兵,等.2013年3月涿鹿微震群遗漏地震事件检测和发震构造分析[J].地球物理学报,2014,57(6):1 847-1 856.
[7]刘希强,周慧兰,郑治真,等.基于小波包变换的弱震相识别方法[J].地震学报,1998,20(4):373-380.
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[10]张瑞红,林大超,乔兰.最优小波包变换在地震信号去噪中的应用[J].地震研究,2011,34(3):358-364.
[11]冉慧敏,马宝柱.2008年10月5日新疆乌恰6.8级地震及其6.3级余震定位分析[J].内陆地震,2008,22(4):369-377.
[12]田玥,陈晓非.地震定位研究综述[J].地球物理学进展,2002,3(1):147-155.
(1)北京港震机电技术有限公司.交互分析软件EDSP-IAS使用手册,2005年.
(2)广东省地震监测中心.MSDP-DM地震台网数据处理及数据库管理软件用户手册,2007年.
[2]Schaff D P,Richards P G.Lg-wave cross correlation and double difference location:application to the 1999 Xinyan,China,sequence[J].Bulletin of the Seismological Society of America,2004,94(3):867-879.
[3]Schaff D P,Waldhauser F.Waveform cross-correlation-based differential travel time measurements at the Northern California Seismic Network[J].Bulletin of the Seismological Society of America,2005,95(6):2 446-2 461.
[4]Gibbons S J,Ringdal F.The detection of low magnitude seismic events using array based waveform correlation[J].Geophysical Journal International,2006,165(1):149-166.
[5]Yang H F,Zhu L P,Chu R S.Fault-plane determination of the 18 April 2008 Mount Carmel,Illionis,earthquake by detecting and relocating after shocks[J].Bulletin of the Seismological Society of America,2009,99(6):3 413-3 420.
[6]谭毅培,曹井泉,刘文兵,等.2013年3月涿鹿微震群遗漏地震事件检测和发震构造分析[J].地球物理学报,2014,57(6):1 847-1 856.
[7]刘希强,周慧兰,郑治真,等.基于小波包变换的弱震相识别方法[J].地震学报,1998,20(4):373-380.
[8]冯雪玲,李志海,潘振生,等.基于小波包变换的重叠地震波分离[J].地震地磁观测与研究,2013,34(1):66-70.
[9]李永刚,李锦萍.有限长单位冲激响应FIR数字滤波器线性相位分析和结构图[J].首都师范大学学报(自然科学版),2002,23(2):25-28.
[10]张瑞红,林大超,乔兰.最优小波包变换在地震信号去噪中的应用[J].地震研究,2011,34(3):358-364.
[11]冉慧敏,马宝柱.2008年10月5日新疆乌恰6.8级地震及其6.3级余震定位分析[J].内陆地震,2008,22(4):369-377.
[12]田玥,陈晓非.地震定位研究综述[J].地球物理学进展,2002,3(1):147-155.
(1)北京港震机电技术有限公司.交互分析软件EDSP-IAS使用手册,2005年.
(2)广东省地震监测中心.MSDP-DM地震台网数据处理及数据库管理软件用户手册,2007年.