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3D v_P and v_S models of southeastern margin of the tibetan plateau from joint inversion of body-wave arrival times and surface-wave dispersion data

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Earthquake Science 2017年第1期30卷 17-32页

作者： Lina Gao Haijiang Zhang Huajian Yao Hui Huang School of Geoexploration Science and Technology Jilin University Laboratory of Seismology and Physics of Earth’s Interior School of Earth and Space SciencesUniversity of Science and Technology of China National Geophysical Observatory at Mengcheng Department of Earth Atmospheric and Planetary SciencesMassachusetts Institute of Technology

A new 3D velocity model of the crust and upper mantle in the southeastern （SE） margin of the tibetan plateau was obtained by joint inversion of body- and sur- face-wave data. For the body-wave data, we used 7190 events recorded by 102 stations in the SE margin of the tibetan plateau. The surface-wave data consist of Rayleigh wave phase velocity dispersion curves obtained from ambient noise cross-correlation analysis recorded by a dense array in the SE margin of the tibetan plateau. The joint inversion clearly improves the Vs model because it is constrained by both data types. The results show that at around 10 km depth there are two low-velocity anomalies embedded within three high-velocity bodies along the Longmenshan fault system. These high-velocity bodies correspond well with the Precambrian massifs, and the two located to the northeast of 2013 Ms 7.0 Lushan earthquake are associated with high fault slip areas during the 2008 Wenchuan earthquake. The aftershock gap between 2013 Lushan earthquake and 2008 Wenchuan earthquake is associated with low-velocity anomalies, which also acts as a barrier zone for ruptures of two earthquakes. Generally large earthquakes （M 〉 5） in the region occurring from 2008 to 2015 are located around the high-velocity zones, indicating that they may act as asperities for these large earthquakes. Joint inversion results also clearly show that there exist low-velocity or weak zones in the mid-lower crust, which are not evenly distributed beneath the SE margin of tibetan plateau.

关键词： Joint inversion - Body waves Surface waves Aftershock gap the southeastern margin of tibetan plateau

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