International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 12 Issue: 03 | Mar 2025
p-ISSN: 2395-0072
www.irjet.net
INTEGRATED GEOELECTRICAL AND SEISMIC APPROACH FOR LANDSLIDE ASSESSMENT:A CASE STUDY IN THUNGSONG SITE,THAILAND. ANANNYA SURESH.M1, SIMI.K.RAVEENDRAN2, HARITHA HARESH3 MUHAMMED SHAH.A4 1B. TECH UG Student, Department of Civil Engineering at Toms College of Engineering, Kottayam, India. 2Head of Department of Civil Engineering at Toms college of Engineering, Kottayam, India.
---------------------------------------------------------------------***-------------------------------------------------------------------2. STUDY AREA Abstract -This research assesses the possibility of landslide risks in Thungsong Thailand using an integrated geoelectrical and seismic approach. Integrating Electrical Resistivity Tomography (ERT) and Seismic Refraction methods permits the research to map subsurface structures, determine possible slip surfaces, and evaluate soil and bedrock properties. Such results illustrate the effectiveness of these geophysical techniques in scanning regions prone to landslides, thus helping in risk management and land-use planning. This method provides an effective means of evaluating landslide risks in other areas of this sort.
Geographical Setting: The chosen study site in Thungsong, Nakhon Si Thammarat Province, Thailand, is an area prone to complex topography and landslides. Thungsong is in the south of Thailand and has a tropical monsoon climate. The region has high seasonal rainfall, particularly during the southwest monsoon season from May to October, with average annual precipitation higher than 2,000 mm. Steep slopes and heavy rainfall combined result in high slope instability in the area. 2.1.
The study area is encircled by rolling hills and low mountains whose elevations range from 50 to 300 meters above sea level. Heavy rainfall, in addition to the slopes, has resulted in a high number of past landslides. Main transport corridor and settlements are within the susceptible areas, making accurate landslide risk assessment more necessary.
Key Words: ERT, SRT, P-wave, Tomography, Seismic waves.
1. INTRODUCTION 1.1. Background: It is a critical threat to human habitations and infrastructure, particularly for the areas with steep slopes and heterogeneous geological formations. Natural landslides can have a catastrophic impact, and understanding the causes and predicting future landslides is therefore vital to reduce their destructive impact. This limitation has made the integrated use of geophysical methods a prominent approach as traditional investigation methods frequently do not provide enough subsurface knowledge. Here we make use of both geoelectrical and seismic techniques to investigate the subsurface at the Thungsong site in Thailand, an area prone to landslide activity because of the geologic patchwork underneath its surface to provide a holistic image of the subsurface.
2.2 Geological Features The Thungsong region is composed of metamorphic and sedimentary units, predominantly shale, sandstone, and decomposed granite. The surface is covered with loamy colluvial soil which is highly permeable but tends to get waterlogged. The weak top layer makes landslides more probable, especially during periods of prolonged rainfall. Some important features are: Soil Composition: Upper layers comprises colluvial deposits of silt, sand, and clay. Bedrock: Siltstone and sandstone together with other sedimentary rocks that have low to moderate resistivity and seismic velocity makes the upper portions of the ground.
Detection and prediction of landslides are still verified difficult because of the complicated conditions of subsurface. The traditional single-method approaches might miss crucial elements. The integrated geoelectrical and seismic methods enhance the reliability of analysis, identifying potential slip surfaces and unstable areas This was the problem statement. Objectives of the Study are assessing subsurface conditions with integrated geoelectrical and seismic methods. Then they trace and locate possible landslide hazard regions and to validate each methods findings against the other for increased accuracy.
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Fault Lines: Minor brittle faults and fissures which facilitate entry of water and decrease slope stability may be found the region. Hydrogeological Conditions: The region is characterized by rapid oscillations of ground water having a considerable impact on slopes stability. During rain, water seeps in and increases the pore water pressure within the soil which results in lower shear
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