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Group velocity dispersion analysis in northern Peninsular Malaysia
Authors:Syed Mustafizur Rahman  Md Omar Faruk  Md Habibur Rahman  Mumnunul Keramat  Mohd Nawawi  Faisal Kamal Zaidi
Institution:1.Department of Applied Physics and Electronic Engineering,University of Rajshahi,Rajshahi,Bangladesh;2.Department of ICE,Pabna University of Science and Technology,Pabna,Bangladesh;3.CEGIS,Dhaka,Bangladesh;4.School of Physics,Universiti Sains Malaysia,Gelugor,Malaysia;5.Department of Geology and Geophysics,King Saud University,Riyadh,Kingdom of Saudi Arabia
Abstract:The crustal structure beneath three seismic stations over Malaysia has been investigated with the application of the group velocity dispersion analysis of the northern Sumatra earthquake data which occurred on 06 April 2010. Eighteen crustal layer models are constructed to assess the structure. Group velocity dispersions have been computed for the recorded earthquake data using a graphical method and modified Haskell matrix method for the models. Both dispersions have been presented for the interpretation of crustal layers. Findings have shown four major crustal layers having thicknesses of 2.5–4.0, 2.0–5.5, 5.0–8.0, and 8.5–9.0 km, while in Terengganu, it has shown three layers. Density, shear, and compressional wave velocities used in models have suggested that the crustal structure of the northern part of Peninsular Malaysia is crystalline. Major crustal minerals are of quartz, plagioclase, and mica. Most layers seem to have upward directions toward Perak from Kedah and Terengganu.
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