Geophysical characterization of a sinkhole region : a study toward understanding geohazards in the karst geosites
The outstanding geosites in Satun UNESCO Global Geopark, Thailand are mainly karst topography. Sinkhole which is originated from the dissolution of karst rocks by groundwater or acidic rainwater is one of the potential natural disasters in these geosites. To gain the confident among geotourism, dete...
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| Format: | Article |
| Language: | English |
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Penerbit Universiti Kebangsaan Malaysia
2021
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| Online Access: | http://journalarticle.ukm.my/17550/ http://journalarticle.ukm.my/17550/1/4.pdf |
| _version_ | 1848814341058461696 |
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| author | Sawasdee Yordkayhun, |
| author_facet | Sawasdee Yordkayhun, |
| author_sort | Sawasdee Yordkayhun, |
| building | UKM Institutional Repository |
| collection | Online Access |
| description | The outstanding geosites in Satun UNESCO Global Geopark, Thailand are mainly karst topography. Sinkhole which is originated from the dissolution of karst rocks by groundwater or acidic rainwater is one of the potential natural disasters in these geosites. To gain the confident among geotourism, detecting karst features, cavities and surficial dissolution is crucial in risk assessment and sustainable geopark management. As a part of geohazard assessment, non-invasive geophysical methods were applied for detecting near-surface defects and karst features. In this study, electrical resistivity tomography (ERT), seismic tomography and multichannel analysis of surface waves (MASW) have been integrated to understand the mechanism of an existing sinkhole formation in Satun Geopark region. ERT appeared to be an effective approach to investigate the cavity development at shallow subsurface. MASW and seismic tomography were combined to help constrain the interpretation of lithology and karst features in vicinity of the sinkhole. The results indicated that the sinkhole occurrence in this area was probably developed by forming of cavity due to an increased dissolution of the fractured limestone bedrock. This carbonate layer is in contact with the overlying groundwater and weathering shale or cohesive soil layer. The changing of water table and infiltration of surface water by heavy rainfall allowed for a sudden vertical downward of overlying sediments into the empty voids, leading to the sinkhole hazard. |
| first_indexed | 2025-11-15T00:32:32Z |
| format | Article |
| id | oai:generic.eprints.org:17550 |
| institution | Universiti Kebangasaan Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-15T00:32:32Z |
| publishDate | 2021 |
| publisher | Penerbit Universiti Kebangsaan Malaysia |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | oai:generic.eprints.org:175502021-11-15T01:32:11Z http://journalarticle.ukm.my/17550/ Geophysical characterization of a sinkhole region : a study toward understanding geohazards in the karst geosites Sawasdee Yordkayhun, The outstanding geosites in Satun UNESCO Global Geopark, Thailand are mainly karst topography. Sinkhole which is originated from the dissolution of karst rocks by groundwater or acidic rainwater is one of the potential natural disasters in these geosites. To gain the confident among geotourism, detecting karst features, cavities and surficial dissolution is crucial in risk assessment and sustainable geopark management. As a part of geohazard assessment, non-invasive geophysical methods were applied for detecting near-surface defects and karst features. In this study, electrical resistivity tomography (ERT), seismic tomography and multichannel analysis of surface waves (MASW) have been integrated to understand the mechanism of an existing sinkhole formation in Satun Geopark region. ERT appeared to be an effective approach to investigate the cavity development at shallow subsurface. MASW and seismic tomography were combined to help constrain the interpretation of lithology and karst features in vicinity of the sinkhole. The results indicated that the sinkhole occurrence in this area was probably developed by forming of cavity due to an increased dissolution of the fractured limestone bedrock. This carbonate layer is in contact with the overlying groundwater and weathering shale or cohesive soil layer. The changing of water table and infiltration of surface water by heavy rainfall allowed for a sudden vertical downward of overlying sediments into the empty voids, leading to the sinkhole hazard. Penerbit Universiti Kebangsaan Malaysia 2021-07 Article PeerReviewed application/pdf en http://journalarticle.ukm.my/17550/1/4.pdf Sawasdee Yordkayhun, (2021) Geophysical characterization of a sinkhole region : a study toward understanding geohazards in the karst geosites. Sains Malaysiana, 50 (7). pp. 1871-1884. ISSN 0126-6039 https://www.ukm.my/jsm/malay_journals/jilid50bil7_2021/KandunganJilid50Bil7_2021.html |
| spellingShingle | Sawasdee Yordkayhun, Geophysical characterization of a sinkhole region : a study toward understanding geohazards in the karst geosites |
| title | Geophysical characterization of a sinkhole region : a study toward understanding geohazards in the karst geosites |
| title_full | Geophysical characterization of a sinkhole region : a study toward understanding geohazards in the karst geosites |
| title_fullStr | Geophysical characterization of a sinkhole region : a study toward understanding geohazards in the karst geosites |
| title_full_unstemmed | Geophysical characterization of a sinkhole region : a study toward understanding geohazards in the karst geosites |
| title_short | Geophysical characterization of a sinkhole region : a study toward understanding geohazards in the karst geosites |
| title_sort | geophysical characterization of a sinkhole region : a study toward understanding geohazards in the karst geosites |
| url | http://journalarticle.ukm.my/17550/ http://journalarticle.ukm.my/17550/ http://journalarticle.ukm.my/17550/1/4.pdf |