TITLE:
Electrical Resistivity Survey in Bukit Bunuh, Malaysia for Subsurface Structure of Meteorite Impact Study
AUTHORS:
Mark Jinmin, Rosli Saad, Mokhtar Saidin, Andy A. Bery
KEYWORDS:
Resistivity; Meteorite Impact; Interesting; Integration; Successful
JOURNAL NAME:
Open Journal of Geology,
Vol.3 No.2B,
October
22,
2013
ABSTRACT:
An electrical
resistivity tomography (ERT) study was conducted at Bukit Bunuh, Lenggong Perak
(Malaysia). The study is to justify the features and environmental subsurface
geological structure which is due to the meteorite impact. The ERT survey used
resistivity equipments comprises of 4 survey lines with 5 m electrode
intervals, covering an area of approximately 64 km2. The survey
lines were carried out using ‘roll-along’ technique. The data were processed
and analysed using RES2DINV, Excel and Surfer software in order to produce
electrical resistivity tomography for qualitative interpretations. The results
show the variation of resistivity value and faults. The 2-D resistivity results
generally show the study area was divided into two main zones, alluvium with
resistivity value of 10 - 800 Ωm, and
bedrock with resistivity value of > 1500 Ωm and depth of 20 - 40 m. There are
lots of fractured zones which are different than normal, identified along the
survey lines. The South-North line shows the fractured zones were identified at
760 - 3800 m and 4700 - 5900 m. The West-East line, the
fractured zone was identified at 1545 - 6570 m and
North-West to South-East line, the fractured zone was identified at 740 - 5850 m. Meanwhile, South-West to North-East line, the
fractured zone was identified at 720 - 1520 m. These
interesting results were indicated at position of longitude; 100.965 - 100.978 and latitude; 5.056 - 5.066 where the bedrock depth is 40 - 60 m MSL and highly fractured. The
area was surrounded by high elevated bedrock. Integration
of 2-D resistivity results with boreholes is successful give valid and reliable
results. The results of the study indicate that these geophysical
approaches have a capability of retrieving the meteorite impact subsurface of
the studied area.