Detection of Cavity Using Electrical Resistivity Tomography (ERT) at Patherdih, Jharia Coal Field, Dhanbad, India

Partha Pratim Mahato

doi:10.13189/ujg.2018.060402

Abstract

Geophysical survey for cavity detection is one of the most common near surface application. The usage of resistivity methods are also very straightforward for the air filled underground voids, which should have theoretically very high resistivity in the ERT image, whereas the water filled cavities have low resistivity in Electrical Resistivity Tomography (ERT) image. Three different geoelectric arrays Wenner, Schlumberger and Dipole-dipole are applied for detecting cavities. The survey results suggest that ERT is a viable geophysical tool for the detection and monitoring of mining voids and other subsurface cavities. The resolution capacity of joint Wenner-Schlumberger, Dipole-dipole array for the detection of cavity is greater than that of the individual one. Using the ERT survey in Patherdih Thana Basti village (Jharia coal field), a number of air filled cavity or water filled mining voids are detected at around 25-30m of below the ground level at different profile distance of 630m profile length along the road that extending S-E to N-W direction.

Highlights

The Kura foreland fold-and-thrust belt (KFFTB), which developed earlier (Oligocene–Lower Miocene) as a foreland basin, is located between the Greater Caucasus and Lesser Caucasus (Figure 1) and is a good example of continental mountain building in the Late Cenozoic [1].The structure of KFFTB belt has been the subject of2
According to global positioning system (GPS) data, the convergence rate of the Greater Caucasus and Lesser Caucasus mountains increases from west to east in the Caucasus region; the convergence rate in the Rioni Basin is about 4 mm a-1 and the rate in the Kura foreland is about 14 mm a-1 [15]
The seismic profiles show that the structure and style of deformation of the Kura foreland fundamentally differs from a ‘simple’ thrust model [e.g. 9, 10, 11]

Summary

Introduction

The Kura foreland fold-and-thrust belt (KFFTB), which developed earlier (Oligocene–Lower Miocene) as a foreland basin, is located between the Greater Caucasus and Lesser Caucasus (Figure 1) and is a good example of continental mountain building in the Late Cenozoic [1]

Geological Setting

Structural Interpretation of the Seismic Profile

Discussion

Didi Shiraki Thrust-top Basin

Findings

Conclusions