四川攀枝花2008年8月31日M_S5.6地震震源深度的确定
|
摘要
利用四川区域数字地震台网记录,采用滑动时窗相关法识别sPn震相,测定了四川攀枝花2008年8月31日MS5.6地震的震源深度。研究结果显示,震源深度为17km,表明震源位于中上地壳。元谋—绿汁江断裂带上中强地震分布与断裂走向吻合,震源机制解以走滑为主,这些表明此断裂近乎直立。结合此次地震的震源深度,我们推测此断裂可能达到20km深。
Sliding-window correlation is a useful technique for identifying sPn phase and to constrain earthquake focal depth for an event with MS5.6 occurred on August 31,2008 in Panzhihua of Sichuan province.The result shows that the focal depth is about 17 km,and the hypocenter is located in the upper-to-middle crust.Combining with focal mechanism dominated with strike-slip and distributions of the earthquakes along the Yuanmou-luzhijiang fault,we suggest that the fault is near vertical and may extend to a depth of 20 km.
Sliding-window correlation is a useful technique for identifying sPn phase and to constrain earthquake focal depth for an event with MS5.6 occurred on August 31,2008 in Panzhihua of Sichuan province.The result shows that the focal depth is about 17 km,and the hypocenter is located in the upper-to-middle crust.Combining with focal mechanism dominated with strike-slip and distributions of the earthquakes along the Yuanmou-luzhijiang fault,we suggest that the fault is near vertical and may extend to a depth of 20 km.
引文
[1]Zhao L S and Helmberger D V.Geophsical implications form relocations of Tibetan earthquake:hot litho-sphere.Geophys Res Lett,1991,18(12):2205-2208
[2]Kind R.Observation of sPn from Swabian Alb earthquake at the GRF array.J Geophys,1979,45:337-340
[3]房明山,杜安陆,董孝平,等.用sPn震相测定近震源深度.地震地磁观测与研究,1995,16(5):13-18
[4]任克新,邹立晔,刘瑞丰,等.用sPn计算内蒙地震的震源深度.地震地磁观测与研究,2004,25(3):24-31
[5]洪星,叶雯燕,邵平荣,等.台湾海峡南部一次5.0级地震的sPn震相分析.地震地磁观测与研究,2006,27(1):26-31
[6]Saikia C K.A method for path calibration using regional and teleseismic broadband seismograms:Application to the21May1997Jabalpur,India earthquakes(MW5.8).Seimology,2000(special section):1301-1315
[7]张瑞青,吴庆举,李永华,等.汶川中强余震震源深度的确定及其意义.中国科学(D辑),2008,38(10):1234-1241
[8]陈学波,吴跃强,杜平山,等.龙门山构造带两侧地壳速度结构特征.见:国家地震局科技检测司,中国大陆深度构造的研究与进展.北京:地质出版社,1988:97-113
[9]胡鸿翔,陆涵行,王椿镛,等.滇西地区地壳结构的爆破地震研究.地球物理学报,1986,29(2):133-144
[10]熊绍柏,郑晔,尹周勋,等.丽江—攀枝花—者海地带二维地壳结构及其构造意义.地球物理学报,1993,36(4):434-443
[11]崔作舟,陈纪平,吴苓.花石峡—邵阳深部地壳的结构与构造.北京:地质出版社,1996:159-166
[12]吴建平,明跃红,王椿镛.云南地区中小地震震源机制及构造应力场研究.地震学报,2004,26(5):457-465
[13]李坪,王良谋.云南川西地区地震地质基本特征的探讨.地质科学,1975(4):308-326
[14]梁尚鸿,束沛镒,李幼铭,等.攀西地区地震分布和构造应力场特征,地球物理学报,1986,29(6):557-566
[2]Kind R.Observation of sPn from Swabian Alb earthquake at the GRF array.J Geophys,1979,45:337-340
[3]房明山,杜安陆,董孝平,等.用sPn震相测定近震源深度.地震地磁观测与研究,1995,16(5):13-18
[4]任克新,邹立晔,刘瑞丰,等.用sPn计算内蒙地震的震源深度.地震地磁观测与研究,2004,25(3):24-31
[5]洪星,叶雯燕,邵平荣,等.台湾海峡南部一次5.0级地震的sPn震相分析.地震地磁观测与研究,2006,27(1):26-31
[6]Saikia C K.A method for path calibration using regional and teleseismic broadband seismograms:Application to the21May1997Jabalpur,India earthquakes(MW5.8).Seimology,2000(special section):1301-1315
[7]张瑞青,吴庆举,李永华,等.汶川中强余震震源深度的确定及其意义.中国科学(D辑),2008,38(10):1234-1241
[8]陈学波,吴跃强,杜平山,等.龙门山构造带两侧地壳速度结构特征.见:国家地震局科技检测司,中国大陆深度构造的研究与进展.北京:地质出版社,1988:97-113
[9]胡鸿翔,陆涵行,王椿镛,等.滇西地区地壳结构的爆破地震研究.地球物理学报,1986,29(2):133-144
[10]熊绍柏,郑晔,尹周勋,等.丽江—攀枝花—者海地带二维地壳结构及其构造意义.地球物理学报,1993,36(4):434-443
[11]崔作舟,陈纪平,吴苓.花石峡—邵阳深部地壳的结构与构造.北京:地质出版社,1996:159-166
[12]吴建平,明跃红,王椿镛.云南地区中小地震震源机制及构造应力场研究.地震学报,2004,26(5):457-465
[13]李坪,王良谋.云南川西地区地震地质基本特征的探讨.地质科学,1975(4):308-326
[14]梁尚鸿,束沛镒,李幼铭,等.攀西地区地震分布和构造应力场特征,地球物理学报,1986,29(6):557-566
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