Using integrated geophysics data set to delineate Phetchabun active fault in Thailand

Area of Science:

• Geophysics
• Structural Geology
• Remote Sensing

Background:

• Precisely locating active faults is crucial for understanding seismic hazards.
• The Phetchabun basin requires detailed geological and geophysical investigation to identify active fault systems.

Purpose of the Study:

• To precisely locate active faults within the Phetchabun basin.
• To integrate multiple geophysical methods for enhanced fault detection and characterization.

Main Methods:

• Remote sensing and Digital Elevation Model (DEM) analysis to identify potential fault traces.
• Geomorphological and geological field investigations to validate remote sensing data.
• Gravity surveys and 2D-3D Electrical Resistivity Tomography (ERT) for subsurface structural analysis.

Main Results:

• Gravity models revealed subsurface density contrasts indicative of vertical fault planes.
• ERT inversion images identified fault planes through zones of varying resistivity.
• The integration of three geophysical surveys provided comprehensive data on active fault locations.

Conclusions:

• The combined geophysical approach effectively delineates active faults in the Phetchabun basin.
• Identified fault structures have significant implications for paleo-earthquake research in the region.