Characterization of Khlong Marui Fault Zone using seismic reflection and shear-wave velocity profiles: Case study in Khiriratnikhom district, Surat Thani province, southern Thailand

Detailed fault mapping and characterization are important for seismic hazard assessment. The Khlong Marui Fault Zone (KMFZ) is a major active strike-slip fault system in southern Thailand. It extends in a southwest-northeast direction from Phuket towards Surat Thani province. Although the general fa...

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Main Authors: Sawasdee Yordkayhun, Preeya Sreesuwan, Kamhaeng Wattanasen
Format: บทความวารสาร
Language:English
Published: Science Faculty of Chiang Mai University 2019
Online Access:http://it.science.cmu.ac.th/ejournal/dl.php?journal_id=7609
http://cmuir.cmu.ac.th/jspui/handle/6653943832/63819
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spelling th-cmuir.6653943832-638192019-05-07T09:57:20Z Characterization of Khlong Marui Fault Zone using seismic reflection and shear-wave velocity profiles: Case study in Khiriratnikhom district, Surat Thani province, southern Thailand Sawasdee Yordkayhun Preeya Sreesuwan Kamhaeng Wattanasen Detailed fault mapping and characterization are important for seismic hazard assessment. The Khlong Marui Fault Zone (KMFZ) is a major active strike-slip fault system in southern Thailand. It extends in a southwest-northeast direction from Phuket towards Surat Thani province. Although the general fault system can be identified from surface observations, investigation of the fault zone in Surat Thani province is challenging because the surface expression is not obvious and thick sediments cover the area. Therefore, shallow seismic reflection profiles were acquired in the Khiriratnikhom district, Surat Thani province. The aims of this study were to characterize the subsurface geological structures in the vicinity of the fault zone. For the seismic data analysis, conventional data processing such as data editing, static correction and frequency filtering are effective in enhancing signal to noise ratio of stacked section. However, detailed geological information at shallow levels in the subsurface are not well imaged due to the effects of data acquisition and processing. To address this limitation, seismic reflection and shear wave velocity (Vs) profiles were obtained from multichannel analysis of surface waves (MASW) and are jointly interpreted. The results show a sequence of subsurface boundaries extending from the surface to a depth of about 250 m. The variations in seismic velocities and vertical offset of the main horizon are the fault signature observed on seismic sections and in the shear wave velocity fields. The results coincide well with the fault strike obtained from a previous geophysical interpretation. This finding suggests the possibility of ongoing activity of the KMFZ. 2019-05-07T09:57:20Z 2019-05-07T09:57:20Z 2016 บทความวารสาร 0125-2526 http://it.science.cmu.ac.th/ejournal/dl.php?journal_id=7609 http://cmuir.cmu.ac.th/jspui/handle/6653943832/63819 Eng Science Faculty of Chiang Mai University
institution Chiang Mai University
building Chiang Mai University Library
country Thailand
collection CMU Intellectual Repository
language English
description Detailed fault mapping and characterization are important for seismic hazard assessment. The Khlong Marui Fault Zone (KMFZ) is a major active strike-slip fault system in southern Thailand. It extends in a southwest-northeast direction from Phuket towards Surat Thani province. Although the general fault system can be identified from surface observations, investigation of the fault zone in Surat Thani province is challenging because the surface expression is not obvious and thick sediments cover the area. Therefore, shallow seismic reflection profiles were acquired in the Khiriratnikhom district, Surat Thani province. The aims of this study were to characterize the subsurface geological structures in the vicinity of the fault zone. For the seismic data analysis, conventional data processing such as data editing, static correction and frequency filtering are effective in enhancing signal to noise ratio of stacked section. However, detailed geological information at shallow levels in the subsurface are not well imaged due to the effects of data acquisition and processing. To address this limitation, seismic reflection and shear wave velocity (Vs) profiles were obtained from multichannel analysis of surface waves (MASW) and are jointly interpreted. The results show a sequence of subsurface boundaries extending from the surface to a depth of about 250 m. The variations in seismic velocities and vertical offset of the main horizon are the fault signature observed on seismic sections and in the shear wave velocity fields. The results coincide well with the fault strike obtained from a previous geophysical interpretation. This finding suggests the possibility of ongoing activity of the KMFZ.
format บทความวารสาร
author Sawasdee Yordkayhun
Preeya Sreesuwan
Kamhaeng Wattanasen
spellingShingle Sawasdee Yordkayhun
Preeya Sreesuwan
Kamhaeng Wattanasen
Characterization of Khlong Marui Fault Zone using seismic reflection and shear-wave velocity profiles: Case study in Khiriratnikhom district, Surat Thani province, southern Thailand
author_facet Sawasdee Yordkayhun
Preeya Sreesuwan
Kamhaeng Wattanasen
author_sort Sawasdee Yordkayhun
title Characterization of Khlong Marui Fault Zone using seismic reflection and shear-wave velocity profiles: Case study in Khiriratnikhom district, Surat Thani province, southern Thailand
title_short Characterization of Khlong Marui Fault Zone using seismic reflection and shear-wave velocity profiles: Case study in Khiriratnikhom district, Surat Thani province, southern Thailand
title_full Characterization of Khlong Marui Fault Zone using seismic reflection and shear-wave velocity profiles: Case study in Khiriratnikhom district, Surat Thani province, southern Thailand
title_fullStr Characterization of Khlong Marui Fault Zone using seismic reflection and shear-wave velocity profiles: Case study in Khiriratnikhom district, Surat Thani province, southern Thailand
title_full_unstemmed Characterization of Khlong Marui Fault Zone using seismic reflection and shear-wave velocity profiles: Case study in Khiriratnikhom district, Surat Thani province, southern Thailand
title_sort characterization of khlong marui fault zone using seismic reflection and shear-wave velocity profiles: case study in khiriratnikhom district, surat thani province, southern thailand
publisher Science Faculty of Chiang Mai University
publishDate 2019
url http://it.science.cmu.ac.th/ejournal/dl.php?journal_id=7609
http://cmuir.cmu.ac.th/jspui/handle/6653943832/63819
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