用远场资料反演西藏玛尼地震的高阶地震矩张量  

HIGHER DEGREE MOMENT TENSOR INVERSION OF MANI EARTHQUAKE USING FAR-FIELD BROAD-BAND RECORDING

作　　者：刘瑞丰[1] 陈运泰[1] Frank Krueger 成瑾[1] 杨辉[1] 韩炜[1] 牟磊育[1] 

机构地区：[1]中国地震局地球物理研究所 [2]德国Potsdam大学地球物理研究所

出　　处：《地震学报》2000年第3期225-232,共8页Acta Seismologica Sinica

摘　　要：采用扩展震源模型测定出更多的震源参数 .我们把震源用高阶地震矩张量表示 .为了减少在高阶地震矩张量表达式中出现的大量项 ,采用了 Haskell断层模型 .利用 GSN台网 32个台站的宽频带体波资料 ,反演了西藏玛尼地震的震源参数 .通过实际计算表明 ,该震源是一个走滑断层 ,破裂方向 75°,断层面为=77°、δ=88°,λ=0°,辅助面为=347°、δ=90°、λ=1 78°,破裂持续时间为 1 9s,断层尺度为 47km× 2 8km.这些结果将为地球动力学研究提供新的定量资料 ,对于震源层析成像研究等有实际意义 .In this paper extended earthquake source model is used to calculate more seismic source parameters. In representing seismic source using higher degree moment tensors, Haskell rupture model is used to reduce a large number terms originally presenting in higher degree moment tensor representation. We inverted the source parameters of Mani, Xizang (Tibet), China, earthquake using broad band body wave of 32 stations of Global Seismograph Network (GSN). The results show that it is a strike slip fault, rupture direction is 75°, rupture duration is 19 s, the fault plan is φ=77°, δ=88°, λ=0°, the auxiliary plane is φ=347°, δ=90°, λ=178°, and the fault dimension is 47 km×28 km. These results will give new quantitative data for geodynamics and has practical meaning for seismic source tomography research.

关 键 词：玛尼地震 高阶地震矩 震源参数 数字化 地震 

分 类 号：P315.3[天文地球—地震学] P315.63[天文地球—固体地球物理学]