$Cross-gradient Joint Inversion Of 2d Resistivity And Seismic Refraction Methods$

Cross-gradient Joint Inversion Of 2d Resistivity And Seismic Refraction Methods

Subsurface investigation commonly involved geophysical methods such as 2D resistivity and seismic refraction methods. Each methods are dependent on different physical parameters and has different sensitivity on subsurface structure. In this study, joint inversion with a cross-gradient constraint met...

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Main Author:	Abdullah Sanusi, Nabilah Husna
Format:	Thesis
Language:	English
Published:	2021
Subjects:	QC1 Physics (General)
Online Access:	http://eprints.usm.my/53739/1/NABILAH%20HUSNA%20BINTI%20ABDULLAH%20SANUSI%20-%20TESIS24.pdf
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id	my-usm-ep.53739
record_format	uketd_dc
spelling	my-usm-ep.537392022-07-31T16:05:42Z Cross-gradient Joint Inversion Of 2d Resistivity And Seismic Refraction Methods 2021-10 Abdullah Sanusi, Nabilah Husna QC1 Physics (General) Subsurface investigation commonly involved geophysical methods such as 2D resistivity and seismic refraction methods. Each methods are dependent on different physical parameters and has different sensitivity on subsurface structure. In this study, joint inversion with a cross-gradient constraint method was conducted to map and improved image characterization of lateral and vertical subsurface variation. The basic idea of this approach was to achieve a unified geological model which satisfies both data sets using cross-gradient constraint. This method was conducted on five synthetic models with lateral subsurface variation (Model 1, Model 2, and Model 3) and vertical subsurface variation (Model 4 and Model 5) as preliminary studies. Then, this method was applied to the study areas with lateral subsurface variation (Bunker USM, Tapak Konvo USM, and Guar Jentik) and vertical subsurface variation (Indah Kembara and Bukit Chondong). Particle size distribution (PSD) and X-ray diffraction (XRD) analysis were also conducted on soil and rock samples at Indah Kembara, Guar Jentik, and Bukit Chondong. Cross-gradient joint inversion of seismic model with lateral subsurface variation shows structural improvement of the anomaly. Meanwhile, separate inversion models with vertical subsurface variation already show structural similarities, hence no changes in both cross-gradient joint inversion models. Lateral subsurface variation such as Bunker USM and Tapak Konvo USM shows a structural improvement of the bunker (<40 Ωm, 1.4 - 1.6 km/s) and drain (< 50 Ωm, <0.9 km/s) in joint inversion of seismic models. 2021-10 Thesis http://eprints.usm.my/53739/ http://eprints.usm.my/53739/1/NABILAH%20HUSNA%20BINTI%20ABDULLAH%20SANUSI%20-%20TESIS24.pdf application/pdf en public masters Universiti Sains Malaysia. Pusat Pengajian Sains Fizik
institution	Universiti Sains Malaysia
collection	USM Institutional Repository
language	English
topic	QC1 Physics (General)
spellingShingle	QC1 Physics (General) Abdullah Sanusi, Nabilah Husna Cross-gradient Joint Inversion Of 2d Resistivity And Seismic Refraction Methods
description	Subsurface investigation commonly involved geophysical methods such as 2D resistivity and seismic refraction methods. Each methods are dependent on different physical parameters and has different sensitivity on subsurface structure. In this study, joint inversion with a cross-gradient constraint method was conducted to map and improved image characterization of lateral and vertical subsurface variation. The basic idea of this approach was to achieve a unified geological model which satisfies both data sets using cross-gradient constraint. This method was conducted on five synthetic models with lateral subsurface variation (Model 1, Model 2, and Model 3) and vertical subsurface variation (Model 4 and Model 5) as preliminary studies. Then, this method was applied to the study areas with lateral subsurface variation (Bunker USM, Tapak Konvo USM, and Guar Jentik) and vertical subsurface variation (Indah Kembara and Bukit Chondong). Particle size distribution (PSD) and X-ray diffraction (XRD) analysis were also conducted on soil and rock samples at Indah Kembara, Guar Jentik, and Bukit Chondong. Cross-gradient joint inversion of seismic model with lateral subsurface variation shows structural improvement of the anomaly. Meanwhile, separate inversion models with vertical subsurface variation already show structural similarities, hence no changes in both cross-gradient joint inversion models. Lateral subsurface variation such as Bunker USM and Tapak Konvo USM shows a structural improvement of the bunker (<40 Ωm, 1.4 - 1.6 km/s) and drain (< 50 Ωm, <0.9 km/s) in joint inversion of seismic models.
format	Thesis
qualification_level	Master's degree
author	Abdullah Sanusi, Nabilah Husna
author_facet	Abdullah Sanusi, Nabilah Husna
author_sort	Abdullah Sanusi, Nabilah Husna
title	Cross-gradient Joint Inversion Of 2d Resistivity And Seismic Refraction Methods
title_short	Cross-gradient Joint Inversion Of 2d Resistivity And Seismic Refraction Methods
title_full	Cross-gradient Joint Inversion Of 2d Resistivity And Seismic Refraction Methods
title_fullStr	Cross-gradient Joint Inversion Of 2d Resistivity And Seismic Refraction Methods
title_full_unstemmed	Cross-gradient Joint Inversion Of 2d Resistivity And Seismic Refraction Methods
title_sort	cross-gradient joint inversion of 2d resistivity and seismic refraction methods
granting_institution	Universiti Sains Malaysia.
granting_department	Pusat Pengajian Sains Fizik
publishDate	2021
url	http://eprints.usm.my/53739/1/NABILAH%20HUSNA%20BINTI%20ABDULLAH%20SANUSI%20-%20TESIS24.pdf
_version_	1747822256714678272

Cross-gradient Joint Inversion Of 2d Resistivity And Seismic Refraction Methods

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