The discussion of Taiwan’s Moho depth and Velocity Model comparison from Gravity Data
Speaker:Han chung-ying
Abstract
First study use three seismic velocity models, those determined by Rau and Wu (1995), Kim et al. (2005), and Wu et al. (2007) respectively, were selected for this study. We converted their velocity models to density models using the relationship between P-wave velocity and rock density proposed by Ludwig et al. (1970) and Barton (1986), and then calculated their corresponding gravity anomalies. According to the correlation coef-ficient between the Bouguer anomalies calculated from the velocity models and the revised Bouguer anomalies, the Kim et al. model was more compatible with gravity data than the other two velocity models.
Is also the application of the gravity data, the regional Bouguer gravity anomaly is obtained in Taiwan strait area , reflecting the subsurface structure. Moho depth is then computed by the Parker-Oldenburg iterative method from the regional Bouguer gravity data set. Over the strait area, the geometry of the Moho relief is smooth with an average depth of about 30 km, except for the Penghu up lift. Moho depth is shallower in the Taiwan Strait and thickens to ward both sides of the strait. The relatively shallower Moho depth, reaching up to 28 km, is convex upward underneath the Penghu uplift.

Reference

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??????? Horng-Yuan Yen ?and Hsien-Hsiang Hsieh
?? Terr. Atmos. Ocean. Sci., Vol. 21, No. 6, 897-904, December 2010

1. Moho Depth Derived from Gravity Data in the Taiwan Strait Area

??????? Hsien-Hsiang Hsieh, Horng-Yuan Yen and Min-Hung Shi
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