2000年云南姚安地震余震区的速度和衰减结构层析成像分析

Abstract

Abstract: Three-dimensional V_P, V_S and Q_S structures in the focal area of the 2000 Yaoan M6.5 are obtained by the simultaneous inversion method of travel time and waveform data recorded by a temporary seismic network installed after the earthquakes. The tomography results show that the earthquake occurred at the brim of the area with low-V_P and high-Q_S disturbance anomalies. Most of the aftershocks are in sandwiched V_P and Q_S zones between higher and lower values. The obvious low-V_P anomalies in the focal area demonstrate the existence of the NWW fault and the anomalies is down to the depth of about 10 km. The seismogenic structure of Yaoan earthquake area are further discussed by combining the characters of the aftershock distribution with the velocity and attenuation structures in the focal area.

Key words: Yaoan earthquake, Velocity structure, Attenuation structure, Tomography, Seismic fault

CLC Number:

P315.7

ZHANG Jie-qing, LIU Jie, ZHOU Long-quan. Tomography and Analysis of Velocity and Attenuation Structure for the 2000 Yaoan Aftershock Area in Yunnan[J]. EARTHQUAKE, 2009, 29(3): 126-135.

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Tomography and Analysis of Velocity and Attenuation Structure for the 2000 Yaoan Aftershock Area in Yunnan

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