Geophysical investigation of sinkholes in the tsunami-affected areas in Southern Thailand | |
| Author | Naratip Prechavit |
| Call Number | AIT Thesis no.GE-05-16 |
| Subject(s) | Sinkholes--Thailand, Southern Tsunamis--Thailand |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. GE-05-16 |
| Abstract | Many sinkhole collapses in Southern Thailand occurred after the 26`h December 2004 Sumatra earthquake. The occurrence continued for a period of 11 months for a total of 56 recorded in November 2005. The main causes of sinkhole collapses in Southern Thailand could be ground movements due to the tectonic activity of Sumatra fault as detected by GPS stations in South East Asia which can show very large co-seismic displacement of 27 cm and post-seismic displacement of 6 cm more (mid-February 2005) in Phuket. Sinkhole in Trang and Satun affected by tsunami were investigated in this study. A number of electric forward modeling works were done, using RES2DMOD software, to help understand better type of sinkholes and applicability of electric imaging technique. Three geophysical methods, i.e., electric imaging (EI), magnetic susceptibility and radiometric, were employed for investigating of sinkholes at three study sites in Trang province. The electric imaging could give a good image of subsurface structures, while data obtained from magnetic susceptibility and radiometric method did not show obvious anomalies related to sinkhole locations. Some of the magnetic susceptibility could help indicate the pseudo of limestone. For 2-D El surveys at three sites, the most suitable electrode arrays are Wenner and Wen ner-Schlumberger. At a site in Trang province, the true 3-D El survey was conducted to provide with a 3-D image of the sinkhole. However, the true 3-D survey is limited by the available electrodes and cable lengths. The pseudo 3-D approach based on several parallel 2-D survey lines could give a good pseudo 3-D image, covering a large area much more than true 3-D. |
| Year | 2005 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. GE-05-16 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Geotechnical Engineering (GE) |
| Chairperson(s) | Noppadol Phien-wej;Pham Huy Giao |
| Examination Committee(s) | Glawe, Ulrich |
| Scholarship Donor(s) | Royal Thai Government |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2005 |