A Study on the Compatibility of 3-D Seismic Velocity Structures with Gravity Data of Taiwan

NCUIR > College of Earth Sciences > Graduate Institute of Geophysics > journal & Dissertation > Item 987654321/50513

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/50513

Title:	A Study on the Compatibility of 3-D Seismic Velocity Structures with Gravity Data of Taiwan
Authors:	Yen,HY;Hsieh,HH
Contributors:	地球物理研究所
Keywords:	BENEATH TAIWAN;DEEP-STRUCTURE;SUBDUCTION;COLLISION;CRUST
Date:	2010
Issue Date:	2012-03-27 17:35:50 (UTC+8)
Publisher:	國立中央大學
Abstract:	The Bouguer anomaly of Taiwan has been revised in this study based on more accurate terrain data provided by the Taiwanese Digital Terrain Model compiled by the Taiwan Forestry Bureau. Three seismic velocity models, those determined by Rau and Wu (1995), Kim et al. (2005), and Wu et al. (2007) respectively, were selected for our 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 coefficient 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. The differences between the revised gravity anomaly and the calculated gravity anomalies trend toward positive values at elevations higher than 2000 m. This indicates that the velocities at the shallower depths beneath the mountainous area of the three models are overdetermined, i.e., higher than the real velocities. This ratiocination implies that the crustal thickness beneath the Central Range is less than 55 km which was obtained from the velocity models.
Relation:	TERRESTRIAL ATMOSPHERIC AND OCEANIC SCIENCES
Appears in Collections:	[Graduate Institute of Geophysics] journal & Dissertation

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