Crustal properties of Thailand by geophysical techniques

receiver function and shear-wave splitting analysis

Name: Wisawet Wongwai

LCSH: Kasetsart University -- Dissertations. Ph.D. (Earth Science and Technology) 2019

Classification :.LCCS: QE511

LCSH: Kasetsart University. -- Department of Earth Sciences -- Dissertations

LCSH: Earth (Planet) -- Crust -- Thailand

LCSH: Plate Tectonics -- Thailand

LCSH: Shear waves -- Thailand

LCSH: Seismic waves -- Thailand

Abstract: The tectonic setting of the lithosphere and upper mantle underneath Thailand is varied and changes substantially over short distances. We have mapped these variations using teleseismic receiver function and shear wave splitting (SWS) analysis. The H-k stacking and inversion of receiver functions (RFTN96) were conducted by using 213 teleseismic earthquakes with M > 5.8, and ∆ = 30ᵒ - 90ᵒ, recorded during 2009 to 2011. In addition, we have determined the shear wave splitting fast polarization azimuth (ϕ) and splitting time (δt) using the grid search method from 117 teleseismic earthquakes with M > 5.8, and ∆ = 80ᵒ - 180ᵒ, occurred between 2009 and 2013. The study suggests that the crustal thickness and VP/VS ratio underneath Thailand are from 26.5 km to 40.5 km and 1.60 to 1.85, respectively. The average of crustal thickness under Shan-Thai terrane and Indochina terrane are 30.0 km and 36.0 km, respectively and the average of VP/VS ratio of these terranes are 1.70 and 1.77, respectively. Furthermore, 70% of data from the seismic stations (15 of 22 stations) on the Shan-Thai terrane have N-S fast orientations and an average splitting time of 0.7 ± 0.2 seconds. 100% of the data from seismic stations (14 stations) located on the Indochina terrane (IC) have dominantly E-W fast orientations and an average splitting time of 0.8 ± 0.2 seconds. This observation supports the interpretation that on a lithospheric scale, Thailand consists of two major terranes.

Kasetsart University. Office of the University Library

Address: Bangkok

Email: tdckulib@ku.ac.th

Name: Passakorn Pananont

Role: Thesis Advisor

Created: 2019

Modified: 2025-06-30

Issued: 2025-06-30

วิทยานิพนธ์/Thesis

application/pdf

URL: https://www.lib.ku.ac.th/KUthesis/2562/wisawet-won-all.pdf

CallNumber: QE511 .W57

eng

Spatial: Thailand

Spatial: Thailand

Spatial: Thailand

Spatial: Thailand

DegreeName: Doctor of Philosophy

Level: Doctoral Degraee

Descipline: Earth Science and Technology

Grantor: Kasetsart University

©copyrights Kasetsart University

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