用CAP方法研究大同—阳高4.6级地震震源机制
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摘要
利用CAP方法反演2010年4月4日大同—阳高4.6地震震源机制解,结果表明:此次地震为正断兼有斜滑活动,认为节面Ⅱ的走向、倾向及正断走滑特性与震中附近的六楞山山前断裂吻合,其为发震断裂的可能性较大。
Focal mechanism solution of the Apr.4,2010 Datong-Yanggao earthquake of M 4.6 is inverted by the method of Cap.M_w = 4.5,nodal plane is 89°,39° and —56° for strike,dip and rake angles,respectively.The other nodal plane is 228°,58°,—114°.The estimated foca!depth is about 10 km,for normal with oblique slippery activity.Combined long axis directior of plane of extract position for sequence and fault of the old earthquake zone of the DatongYanggao earthquake of M 6.1,it is considered that the strike,dip and normal with strikeslip characteristic of the nodal plane TJ inosculate the Liulengshan fault near the epicenter,which is probably the fault generating earthquake.
Focal mechanism solution of the Apr.4,2010 Datong-Yanggao earthquake of M 4.6 is inverted by the method of Cap.M_w = 4.5,nodal plane is 89°,39° and —56° for strike,dip and rake angles,respectively.The other nodal plane is 228°,58°,—114°.The estimated foca!depth is about 10 km,for normal with oblique slippery activity.Combined long axis directior of plane of extract position for sequence and fault of the old earthquake zone of the DatongYanggao earthquake of M 6.1,it is considered that the strike,dip and normal with strikeslip characteristic of the nodal plane TJ inosculate the Liulengshan fault near the epicenter,which is probably the fault generating earthquake.
引文
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梁尚鸿,李幼铭,束沛溢,等.利用区域地震台网P、S振幅比资料测定小震震源参数[J].地球物理学报,1984,27(3):249-257.
宋美琴,李斌,吕芳,等.2010年1月24日山西河津—万荣M_s 4.8地震特征[J].地震地磁观测与研究,2012,33(1):16-22.
宋美琴,梁向军,李斌.2009年3月28日原平M_L 4.5地震对周边地震形势影响[J].地震地磁观测与研究,2012,33(3/4):20-25.
宋美琴,郑勇,葛粲,等.山西地震带中小震精确位置及其显示的山西地震构造特征[J].地球物理学报,2012,55(2):513-525.
宋美琴,郑勇,李斌,等.2010年1月24日山西河津-万荣Ms4.8地震的震源机制解与发震构造探讨[J].地震学报,2012,34(1):111-117.
徐扬,田勇,啜永清,等.大同-阳高6.1级震群震源区及其附近地区地壳三维P波速度结构反演[J].山西地震,1997,1-2:24-29.
张成科,张先康,盖玉杰,等.大同-阳高震区及其邻区壳幔速度结构与深部构造[J].地震地质,1998,20(4):391-398.
张学民,束沛镒,刁桂苓,等.山西省部分台站下方S波速度结构研究及与地震关系探讨[J].地震学报,2003,25(4):341-350.
Tan Y,Zhu L P,Helmberger D V,et al.Locating and modeling regional earthquakes with two stations[J].J Geophys Res,2006,111(B01):306-314.
Zhao L S,Helmberger D V.Source estimation from broadband regional seismogram[J].Bull Seism Soc Amer,1994,84(1):91-104.
Zheng Y,Ma H S,Lv J,et al.Source mechanism of strong aftershocks(Ms≥5.6)of the 2008/05/12 Wenchuan earthquake and the implication for seismotectonics[J].Sci China Ser D—Earth Sci,2009,52(6):739-753.
Zheng Y,Ni S D,Xie Z J,et al.Strong aftershocks in the northern segment of the Wenchuan earthquake rupture zone and their seismotectonic implications[J].Earth Planets Space,2010,62(11):881-886.
Zheng Y,Yang Y J,Michael H R,et al.Crustal structure of the northeastern Tibetan plateau,the Ordos block and the Sichuan basin from ambient noise tomography[J].Earthquake Science,2010,23(5):465-476.
Zhu L P,Helmberger D V.Advancement in source estimation techniques using broadband regional seismograms[J].Bull Seism Soc Amer,1996,86(5):1 634-1 641.
Zhu L P,Rivera L A.A note on the dynamic and static displacements from a point source in multilayered media[J].Geophys J Int,2002,148:619-627.
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