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THE CRUSTAL STRUCTURE OF QINGHAI-XIZANG PLATEAU INFERRED FROM BROADBAND TELESEISMIC WAVEFORM

WU QING-JU; ZENG RONG-SHENG(Institute of Geophysics, State Scismological Bureau, Beijing 100081, China)  
In order to study the lithospheric strUcture and its geodyndrics of cynghai-Xizang plateau, the receiver functions of total 11 PASSCAL (Program for Array Seismic Studies of Crust and Lithosphere) stations deployed in Qinghai-Xizang plateau were isolthed from broadband teleseismic waveforms by time-domain maximum entropy deconvolution. One dimensional S wave velocity structures were inverted from receiver funtions. "Jumping Algorithm" is implemented to make trade-off between waveform fitting and model smoothness, and Kennett's seismogram and Randall's efficient differential seismogram were also involved in synthetic seismogram. The inversion results of receiver functions show that there exists obvious Moho offset near BangongNujiang suture in Qinghai-Xizang plateau, three velocity interfaces h1, h2, and h3, can be continuously traced in the crust of Qinghai-Xizang plateau, among which, h1, and h2,can be observed in Wndo, Erdo and Budo, h3 disappears to the north of BangongNuiang suture, there also exists low velocity zone in the crust of Xiga, Lhsa, Sang,Amdo, Erdo and Budo. A possible interpretation about the Moho offset near Bangong-Nujiang suture is that Bangong-Nujiang suture may be the collisional front of Indian crust into the lower crust of Eurasia.
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