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Crustal Azimuthal Anisotropy Beneath The Southeastern Tibetan Plateau And Its Geodynamic Implications, Tuo Zheng, Zhifeng Ding, Jieyuan Ning, Lijun Chang, Xingchen Wang, Fansheng Kong, Kelly H. Liu, Stephen S. Gao

Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works

The fast orientation and magnitude of crustal azimuthal anisotropy beneath the southeastern Tibetan Plateau and adjacent areas are measured by analyzing the sinusoidal moveout of the P to S converted phase from the Moho. Beneath the tectonically active plateau, the mean magnitude is 0.48 ±Â 0.13 s, which is about twice as large as that observed in the stable Sichuan Basin (0.23 ±Â 0.10 s). The two areas are separated by the Longmenshan fault zone, a zone of devastating earthquakes including the 12 May 2008 M_W 7.9 Wenchuan earthquake. Fault orthogonal fast orientations observed in the southern Longmenshan fault …