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ABSTRACT The Phang Nga geothermal area represents a small, moderate temperature, deep circulating geothermal system, apparently typical of those associated to hot springs in southern, central and northern Thailand. An integrated geological, geochemical and geophysical study was carried out and was found to be useful for understanding subsurface flow characteristics and for developing a conceptual model of the system. Resistivity and magnetotellurics (MT) data at a depth of down to 500 m define a low-resistivity layer with shallow hot aquifer water. Residual magnetic intensity from aeromagnetic data indicate that the hot spring area is apparently located at the boundary between two larger igneous bodies, both likely granitic bodies. Partially equilibrated and immature hot spring waters indicate reservoir temperatures between 100 to 120 °C determined with geothermometers. Possibility of the origin of the hot spring is derived from deep circulation of lower resistive meteoric waters, based on MT data down to 2 km, and which is controlled by faults that are associated either with the igneous bodies or larger tectonics. A regional forced convective-circulation model for this geothermal area is suggested, thus reflecting deep structural controls of the fluid pathways in this area, which has limited the degree of mixing. Presentation Date: Tuesday, September 26, 2017 Start Time: 3:55 PM Location: 370C Presentation Type: ORAL
Charusrojthanadech, Nunthawath (Department of Civil Engineering, Faculty of Engineering, King Mongkut'sInstitute of Technology Ladkrabang, Bangkok, Thailand) | Yamamoto, Yoshimichi (Tokai University, Graduate School, Science-and-Engineering Hiratsuka-shi, Kanagawa-ken, Japan) | Kawai, Kyohei (Tokai University, Graduate School, Civil Engineering, Japan)
ABSTRACT This paper summarizes a method for estimating the degree and geographic extent of tsunami disaster damage from Indian Ocean Tsunami by using geo-spatial data (such as satellite remote sensing images, aerial photographs, topographic map, ground photos and field survey results) in two case studies of damage to west coast of southern Thailand. The authors learned the following from these case studies:the extent of flooding can be estimated from discoloration of vegetation; damage to buildings can be estimated by deciphering whether the roof was lost or not; and damage to coastal facilities such as seawall can be also estimated by deciphering from geo-spatial information. Moreover, the authors developed a methodology to estimate the risk of a seawall being washed away by using a laboratory experiment and also developed a methodology to show how tsunami damage can be evaluated. INTRODUCTION Tsunami is that cause massive damage occur every few decades somewhere in the world. On December 26, 2004, the 9.0 magnitude Sumatra Andaman mega thrust earthquake spawned gigantic seismic waves or tsunami in the Indian Ocean which caused large scale coastal flooding in various countries such as Indonesia, Thailand, Sri Langka, India, Bangladesh, Malaysia, etc. In Thailand, the area affected by the Tsunami was located in the west coast of six of its southern province. The tsunami caused the death of people including Phang-nga, Phuket, Krabi, Ranong, Trang and Satun. The tsunami caused people were killed, coast plain flooding, resulting in damage to many buildings, coastal facilities, beaches, inlets, etc. Preventing the occurrence of tsunamis is impossible with current technology level, but it is possible to minimize tsunami damage if detailed estimates of potential damage are made.