| Earthquake relocation and 3-dimensional crustal structure of P-wave velocity in cen-tral-western China |
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| 作者姓名： | 杨智娴 于湘伟 郑月军 陈运泰 倪晓晞 Winston CHAN |
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| 作者单位： | Institute of Geophysics，China Seismological Bureau，Institute of Geophysics，China Seismological Bureau，Institute of Crustal Dynamics，China Seismological Bureau，Institute of Geophysics，China Seismological Bureau，Multimax，Inc.，MD 20774，USA，Multimax，Inc.，MD 20774，USA Beijing 100081，China，Beijing 100081，China，Beijing 100085，China，Beijing 100081，China |
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| 基金项目： | Key Project Process Mechanism and Prediction of Geological Hazards (2001CB711005-1-3) and State Key Basic Research Project Mechanism and Prediction of Continental Earthquakes (G1998040702). sponsored by the Ministry of Science and Techno |
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| 摘 要： | IntroductionUnderstandingthemechanismofcontinentalearthquakesisveryimportantforseismichaz-ardpreventionandearthquakeprediction.Themodernseismotectonictheoryandtheideaofearthquakepredictionaredevelopedmainlyfromthestudiesoninterplateearthquakes,whicharedifficulttoexplainthephenomenaofintraplateearthquakes,suchasthecontinentalearthquakesoccurredinChinesemainland.Whiletheinterplateearthquakesoccurredalongtheplatebounda-ries,theintraplateearthquakesdistributediffuselyintheinterioroftheplates.Thus…
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Earthquake relocation and 3-dimensional crustal structure of P-wave velocity in central-western China |
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| Winston CHAN.Earthquake relocation and 3-dimensional crustal structure of P-wave velocity in cen-tral-western China[J].Acta Seismologica Sinica(English Edition),2004,17(1):20-30. |
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| Authors: | Winston CHAN |
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| Abstract: | A simultaneous inversion of earthquake relocation and three-dimensional crustal structure of P-wave velocity in central-western
China (21°N～36°N, 98°E～112°E) were performed in this paper. The crustal P-wave velocity model and earthquake relocation for
this region are obtained using Pg and Sg phase readings of 9 988 earthquakes from 1992 to 1999 recorded at 193 seismic stations within central-western China by SPHYPIT90
and SPHREL3D90 programs. A lateral inhomogeneous structure of P-wave velocity in this region was obtained. Obvious contrast
of P-wave velocities was revealed on both sides of active fault zones. Relocated epicenters of 6 459 events show clear lineation
along active faults, which indicated a close correlation between seismicity and the active faults in this region. Focal depths
of 82% relocated events ranged from 0 to 20 km, which is in good agreement with that from double-difference earthquake location
algorithm. |
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| Keywords: | simultaneous inversion 3-D P-wave velocity structure earthquake relocation central-western China |
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