Sukrit Jonjana, Worawut Lohawijarn and Helmut Dürrast

pp. 231 - 239

Abstract

Geophysical measurements were conducted in the Kaochaison hot spring area in southern Thailand. The purpose of
this work is to determine subsurface geological structures related to the hot spring. Ninety-five gravity points and thirtyseven resistivity soundings were measured in the study area. A positive gravity anomaly is observed in the same area of high
resistive bedrock over the Kaochaison hot spring. Both anomalies have an elongated shape with its major axis in N010W
direction. A shallow Permian limestone of about 1 km thickness was modeled to explain this positive gravity anomaly. This
Permian limestone is likely to be a part of a horst and graben structure related to the regional tectonics and the normal faults
act as pathways of the hot waters from a deeper heat source. 

Keywords

• Hot spring
• gravity anomaly
• resistivity sounding
• horst and graben
• Phattalung