Investigation of Morphotectonics along the Mae Chan and Nam Ma Fault Zones, Thailand-Laos-Myanmar Borders
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Abstract
The Mae Chan and Nam Ma faults are well-known as active faults which were in mainland Southeast Asia including the borders of Thailand, Laos, and Myanmar country. In this study, the morphotectonic analysis used various geomorphic indices to evaluate relative tectonic activity in the study area. A digital elevation model from the Advanced Spaceborne Thermal Emission Radiometer (ASTER) was chosen to create the watershed delineation with an analysis of the geological data and hydrogeological model. The total of hydrogeological basins is 38 basins. The six geomorphic indices to use in this study are mountain front sinuosity (SMF), valley floor width to height ratio (VF), stream length gradient index (SL), basin shape index (BS), basin asymmetry index (AF), and basin hypsometric index (HI). The analysis found that lineament patterns of the Mae Chan and Nam Ma fault mainly trend in the NE-SW direction. The result of the calculated geomorphic index reveals the low values of SMF index between 1.05-4.84, the low values of VF index from 0.42 to 25.36, the high values of SL index, a wide range of values of BS index between 1.00-3.60, AF index between 13.15 to 88.01 and the low values of HI index between 0.11 to 0.40 to facilitate with the active tectonic landforms in the study area.
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Copyright © 2008 Department of Geology, Faculty of Science, Chulalongkorn University. Parts of an article can be photocopied or reproduced without prior written permission from the author(s), but due acknowledgments should be stated or cited accordingly.
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