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Estimation of the Crustal Vp/Vs Ratio with Dipping Moho from Receiver Functions

The Moho discontinuity is often deformed by complex forces in tectonic zones, which may lead to a dipping Moho locally. In order to obtain accurate crustal Vp/Vs ratio for these regions, this paper proposed a H-κ-θ stacking method to estimate the crustal Vp/Vs and thickness, which considers the responses of a dipping Moho. Both radial and tangential receiver functions were stacked, so that improves the scanning precision. Results of its application to southeastern Tibet indicate that the crustal thickness beneath southeastern Tibet varied notably. The average crustal thickness is about 60 km, 47 km and 43 km in Songpan-Garze fold system, Sichuan basin and Yangtze platform, respectively, with a normal value in Sanjiang fold zone and southeastern Yangtze platform. The crustal Vp/Vs ratio is higher in the region between the Songpan-Garze fold system and Yangtze platform, and is abnormally highest to the west of Sichuan basin (> 1.88). We presume that the eastward crustal material flow was resisted by the Sichuan basin with high strength, and accumulated at west of Sichuan, consequently resulting in the unusual high Vp/Vs anomaly.