Modelling Of Potential Field Data For Shallow Thermal And Crustal Structure Beneath Peninsular Malaysia

This thesis has taken advantage of the global compilation of potential field data to derive the first regional thermal structure as well as the most resolved crustal thickness model for the entire Peninsular Malaysia and neighbouring regions. Bore-hole heat flow data can provide the most precise inf...

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Main Author:	Yaro, Usman Yahaya
Format:	Thesis
Language:	English
Published:	2022
Subjects:	QC1 Physics (General)
Online Access:	http://eprints.usm.my/61344/1/24%20Pages%20from%20USMAN%20YAHAYA%20YARO.pdf
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id	my-usm-ep.61344
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spelling	my-usm-ep.613442024-10-22T00:41:41Z Modelling Of Potential Field Data For Shallow Thermal And Crustal Structure Beneath Peninsular Malaysia 2022-12 Yaro, Usman Yahaya QC1 Physics (General) This thesis has taken advantage of the global compilation of potential field data to derive the first regional thermal structure as well as the most resolved crustal thickness model for the entire Peninsular Malaysia and neighbouring regions. Bore-hole heat flow data can provide the most precise information about the thermal structure of the crust, but these measurements are extremely difficult to obtain (expensive, sparse, and limited to shallow depths). The depth to bottom of magnetic sources (DBMS) has traditionally been used as alternative to surface heat flow data. In this study, DBMS are derived assuming random uncorrelated and fractal magnetisation models. DBMS using fractal distribution of sources (~ 17 – 46 km with a mean of 29 km) are found to be lower than the values computed using conventional random method (29 – 67.4 km with a mean value of 49.3 km) and reasonably well while considering other tectonic and geophysical constraints. Despite, the differences in the derived DBMS for the two methods, visual inspection and cross plots shows that they are linearly correlated, and they have the same pattern and trends. Crustal thickness for the study area varies from ~ 27.4 – 34.6 km with an average of 30.8 km. A comparison between the derived DBMS and crustal thickness shows that the upper mantle beneath the west Sumatra, Singapore, Malay basin, NW Peninsular Malaysia, and southern Thailand are significantly magnetised. The presence of magnetic upper mantle point to the stability of these regions attributable to low heat flow, geothermal gradient, and serpentinization. 2022-12 Thesis http://eprints.usm.my/61344/ http://eprints.usm.my/61344/1/24%20Pages%20from%20USMAN%20YAHAYA%20YARO.pdf application/pdf en public phd doctoral Perpustakaan Hamzah Sendut Pusat Pengajian Sains Fizik
institution	Universiti Sains Malaysia
collection	USM Institutional Repository
language	English
topic	QC1 Physics (General)
spellingShingle	QC1 Physics (General) Yaro, Usman Yahaya Modelling Of Potential Field Data For Shallow Thermal And Crustal Structure Beneath Peninsular Malaysia
description	This thesis has taken advantage of the global compilation of potential field data to derive the first regional thermal structure as well as the most resolved crustal thickness model for the entire Peninsular Malaysia and neighbouring regions. Bore-hole heat flow data can provide the most precise information about the thermal structure of the crust, but these measurements are extremely difficult to obtain (expensive, sparse, and limited to shallow depths). The depth to bottom of magnetic sources (DBMS) has traditionally been used as alternative to surface heat flow data. In this study, DBMS are derived assuming random uncorrelated and fractal magnetisation models. DBMS using fractal distribution of sources (~ 17 – 46 km with a mean of 29 km) are found to be lower than the values computed using conventional random method (29 – 67.4 km with a mean value of 49.3 km) and reasonably well while considering other tectonic and geophysical constraints. Despite, the differences in the derived DBMS for the two methods, visual inspection and cross plots shows that they are linearly correlated, and they have the same pattern and trends. Crustal thickness for the study area varies from ~ 27.4 – 34.6 km with an average of 30.8 km. A comparison between the derived DBMS and crustal thickness shows that the upper mantle beneath the west Sumatra, Singapore, Malay basin, NW Peninsular Malaysia, and southern Thailand are significantly magnetised. The presence of magnetic upper mantle point to the stability of these regions attributable to low heat flow, geothermal gradient, and serpentinization.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Yaro, Usman Yahaya
author_facet	Yaro, Usman Yahaya
author_sort	Yaro, Usman Yahaya
title	Modelling Of Potential Field Data For Shallow Thermal And Crustal Structure Beneath Peninsular Malaysia
title_short	Modelling Of Potential Field Data For Shallow Thermal And Crustal Structure Beneath Peninsular Malaysia
title_full	Modelling Of Potential Field Data For Shallow Thermal And Crustal Structure Beneath Peninsular Malaysia
title_fullStr	Modelling Of Potential Field Data For Shallow Thermal And Crustal Structure Beneath Peninsular Malaysia
title_full_unstemmed	Modelling Of Potential Field Data For Shallow Thermal And Crustal Structure Beneath Peninsular Malaysia
title_sort	modelling of potential field data for shallow thermal and crustal structure beneath peninsular malaysia
granting_institution	Perpustakaan Hamzah Sendut
granting_department	Pusat Pengajian Sains Fizik
publishDate	2022
url	http://eprints.usm.my/61344/1/24%20Pages%20from%20USMAN%20YAHAYA%20YARO.pdf
_version_	1818647398755336192

Modelling Of Potential Field Data For Shallow Thermal And Crustal Structure Beneath Peninsular Malaysia

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