重庆荣昌地区S波分裂研究
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摘要
利用荣昌地区数字地震波资料,计算该区S波分裂参数,使用获得的S波分裂参数研究汶川地震对荣昌地区介质的影响。结果表明,汶川地震前后快波偏振方向无显著改变,均与区域范围内断裂及断层走向相关性较好;随着汶川地震的临震,延迟时间增大,而震后大约1年多的时间内,S波分裂的快、慢波延迟时间维持在较小的水平,之后延迟时间出现恢复性增大,并表现出与荣昌地震活动相关的特征。
Use digital seismic data in Rongchang to calculate S-wave splitting parameters in this area,and then use the parameters obtained to study the effect of Wenchuan earthquake to the media in Rongchang.The result indicates that the distribution of fast shear-wave polarization direction is consistent wish the fault in this area before and after Wenchuan earthquake;delay time increased with Wenchuan earthquake approaching,and maintained at a smaller level in about one year after Wenchuan earthquake,then the delay time turned back,and the result associated with the seismic activity in this area.
Use digital seismic data in Rongchang to calculate S-wave splitting parameters in this area,and then use the parameters obtained to study the effect of Wenchuan earthquake to the media in Rongchang.The result indicates that the distribution of fast shear-wave polarization direction is consistent wish the fault in this area before and after Wenchuan earthquake;delay time increased with Wenchuan earthquake approaching,and maintained at a smaller level in about one year after Wenchuan earthquake,then the delay time turned back,and the result associated with the seismic activity in this area.
引文
[1]Crampin S.Seismic-wave propagation through a crackedsolid:polarization as a possible dilatancy diagnostic[J].Geophysical Journal of the Royal Astronomical Society,19785,3(3):467-496.
[2]Li Yong-gang,Deng Da-liang and Henyey T.L.Shear-wave splitting observations in the northern Los Angelesbasin,southern California[J].Bull.Seis.Soc.Am.,19948,4(2):307-323.
[3]Zinke J C and Zoback M D.Structure-related and stress-induced shear-wave velocity anisotropy Observation frommicro-earthquakes near the Calaveras fault in centralCalifornia[J].BSSA,2000,90:305-1312.
[4]廖武林,丁志峰,曾融生,等.喜马拉雅地区S波分裂研究[J].地球物理学报,2007,50(5):1437-1447.
[5]赵根模,刁桂苓,赵慧君,等.唐山地区Ms6.9和Ms6.5地震前后S波分裂的变化[J].内陆地震,1999,13(1):17-24.
[6]贺曼秋,魏红梅,章静,等.荣昌台S波分裂研究[J].内陆地震,2008,22(1):84-88.
[7]李强,郭欣,张华.S波分裂方法在荣昌地震研究中的初步应用[J].防灾科技学院学报,2007,9(3):34-385,4.
[8]华卫,刘杰,陈章立,等.2003年云南大姚6.2级、6.1级地震序列S波分裂研究[J].地震学报,2006,28(4):357-371.
[9]邬成栋,付虹,刘杰.2003年云南大姚6.2级和6.1级地震余震S波分裂研究[J].地震,2006,26(1):1-9.
[10]曹凤娟,王连权,张萍,等.岫岩Ms5.4地震前后S波分裂研究[J].东北地震研究,2005,21(4):39-44.
[11]朱新运,魏红梅,黄世源.基于MATLAB的S波分裂软件的研制[J].大地测量与地球动力学,2009,29(6):133-138.
[12]Shih X R,Meyer P and Schneider J F.An automated analytic method to determine shear-wave anisotropy[J].Tectonophysics,1989,165:271-278.
[13]Savage M K,et al.Shear wave anlsotropy of activetectonic regions via automated shear wave polarizationanalysis[J].Teetonophysics1,9891,65:279-292.
[14]丁仁杰,李克昌.重庆地震研究[M].北京:地震出版社,2004.
[2]Li Yong-gang,Deng Da-liang and Henyey T.L.Shear-wave splitting observations in the northern Los Angelesbasin,southern California[J].Bull.Seis.Soc.Am.,19948,4(2):307-323.
[3]Zinke J C and Zoback M D.Structure-related and stress-induced shear-wave velocity anisotropy Observation frommicro-earthquakes near the Calaveras fault in centralCalifornia[J].BSSA,2000,90:305-1312.
[4]廖武林,丁志峰,曾融生,等.喜马拉雅地区S波分裂研究[J].地球物理学报,2007,50(5):1437-1447.
[5]赵根模,刁桂苓,赵慧君,等.唐山地区Ms6.9和Ms6.5地震前后S波分裂的变化[J].内陆地震,1999,13(1):17-24.
[6]贺曼秋,魏红梅,章静,等.荣昌台S波分裂研究[J].内陆地震,2008,22(1):84-88.
[7]李强,郭欣,张华.S波分裂方法在荣昌地震研究中的初步应用[J].防灾科技学院学报,2007,9(3):34-385,4.
[8]华卫,刘杰,陈章立,等.2003年云南大姚6.2级、6.1级地震序列S波分裂研究[J].地震学报,2006,28(4):357-371.
[9]邬成栋,付虹,刘杰.2003年云南大姚6.2级和6.1级地震余震S波分裂研究[J].地震,2006,26(1):1-9.
[10]曹凤娟,王连权,张萍,等.岫岩Ms5.4地震前后S波分裂研究[J].东北地震研究,2005,21(4):39-44.
[11]朱新运,魏红梅,黄世源.基于MATLAB的S波分裂软件的研制[J].大地测量与地球动力学,2009,29(6):133-138.
[12]Shih X R,Meyer P and Schneider J F.An automated analytic method to determine shear-wave anisotropy[J].Tectonophysics,1989,165:271-278.
[13]Savage M K,et al.Shear wave anlsotropy of activetectonic regions via automated shear wave polarizationanalysis[J].Teetonophysics1,9891,65:279-292.
[14]丁仁杰,李克昌.重庆地震研究[M].北京:地震出版社,2004.
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