The structure and kinematics of the central Taiwan mountain belt derived from geological and seismicity data

Speaker:Han chung-yin

Date: 2013/04/11

Abstract

A method to model 3D sedimentary basins with parabolic density contrast is applied to Buyuk Menderes basin in Western Anatolia , Chintalpudi sub-basin, India and the Los Angeles basin, California, USA. The measured gravity fields, reduced to a horizontal plane, are assumed to be available at grid nodes of a rectangular/square mesh. Juxtaposed 3D vertical prisms with their geometrical epicenters on top coincide with grid nodes of a mesh to approximate a sedimentary basin. The algorithm based on Newton’s forward difference formula automatically calculates the initial depth estimates of a sedimentary basin assuming that 2D infinite horizontal slabs can generate the measured gravity fields and among these slabs the density contrast varies with depth. The lower boundary of a sedimentary basin is formulated by estimating the depth values of the 3D prisms with in predetermined limits. Measured gravity fields pertaining to the Buyuk Menderes basin, Turkey, Chintalpudi sub-basin, India and the Los Angeles basin, California, USA ,where the density contrast varies with depth, are interpreted to show the applicability of the method.

 

Reference

• Mahir Is?k , Hakk? Senel , 2009.? 3D gravity modeling of Buyuk Menderes basin in Western Anatolia using parabolic density function.? Journal of Asian Earth Sciences 34 , 317–325

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• V. Chakravarthia,? N. Sundararajan ,2004.? Automatic 3-D gravity modeling of sedimentary basins with density contrast varying parabolically with depth.? Computers & Geosciences 30 601–607

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