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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
http://eprints.usm.my/53739/
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spelling my.usm.eprints.53739 http://eprints.usm.my/53739/ Cross-gradient Joint Inversion Of 2d Resistivity And Seismic Refraction Methods 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 NonPeerReviewed application/pdf en http://eprints.usm.my/53739/1/NABILAH%20HUSNA%20BINTI%20ABDULLAH%20SANUSI%20-%20TESIS24.pdf Abdullah Sanusi, Nabilah Husna (2021) Cross-gradient Joint Inversion Of 2d Resistivity And Seismic Refraction Methods. Masters thesis, Universiti Sains Malaysia..
institution Universiti Sains Malaysia
building Hamzah Sendut Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Sains Malaysia
content_source USM Institutional Repository
url_provider http://eprints.usm.my/
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
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
publishDate 2021
url http://eprints.usm.my/53739/1/NABILAH%20HUSNA%20BINTI%20ABDULLAH%20SANUSI%20-%20TESIS24.pdf
http://eprints.usm.my/53739/
_version_ 1740826571104583680
score 13.222552

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