| Abstract: | The goal of this study is to determine earthquake source processes of moderate to strong earthquakes in Western China using data recorded by the digital broadband stations in and near China. There are 12 broadband stations on the Chinese mainland. This paper used a kind of moment tensor inversion method to study the large earthquakes in the Xizang (Tibet) region of China.In this study, we first ported and tested a moment\|tensor inversion code and then applied the technique to a large (magnitude M s=7.9) earthquake in Xizang region of China. The inversion for the earthquake moment tensor is performed in the frequency domain by fitting long\|period observed spectra to synthetic spectra calculated. For details of the method refer to Giardini and Beranzoli (1992). As part of the project, we extended the library of synthetics by including local (>100km) and teleseismic distances (2000km
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