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Subsurface Study of Meteorite Impact Crater at Bukit Bunuh using 2-D Resistivity Method with EHR technique

Abstract

Impact craters are the most characteristic features of planetary bodies. Geophysical studies of subsurface crater structure may assists in studying of deformation and fracturing of target rocks. This paper presents the results of a study of subsurface deformation and fracturing at Bukit Bunuh, Perak (Malaysia) using 2-D resistivity method with Enhancing Horizontal Resolution (EHR) technique. The study line was North-West to South-East direction, cross to Perak River and two mountain ranges, the Bintang Range and the Titiwangsa Range. A survey line of 6.61 km was covered using Pole-dipole array with 5 m minimum electrode spacing. The Enhancing Horizontal Resolution (EHR) technique is applied to get detail and deeper penetration to study subsurface of impact crater. By using the EHR technique the depth of penetration to map the subsurface can reach up to 140 m. This technique is not only can map deeper subsurface but it also can get detail image of fractures along the survey line which could be the effect of the meteorites impact. From the results of 2-D resistivity method with EHR technique, it shows that the area consists of two main zones. The first zone with resistivity value of 10-800 ohm-m and thickness 5-60 m was interpreted as alluvium consist of boulders with resistivity value of >6000 ohm-m. The second zone with resistivity value >20 000 ohm-m was bedrock. There is also a structure of fault is found along the survey line. This technique may improve the horizontal resolution and may be useful strategy for improved resistivity in engineering and environmental works.

Key words

Enhancing Horizontal Resolution (EHR), 2-D Resistivity, Fractures, Meteorite Impact, Bukit Bunuh, Crater

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