Delineating Bedrock Topography of Bukit Bunuh by Seismic Refraction Technique as an Indication of Impact Crater

 

Senior Lecturer, Dr. Rosli Saad

Geophysics Section, School of Physics, 11800 Universiti Sains Malaysia, Penang, Malaysia. e-mail:rosli@usm.my

Assoc. Prof., Dr. M. Mokhtar Saidin

Centre for Global Archeological Research Malaysia, 11800 Universiti Sains Malaysia, Penang, Malaysia. e-mail:mmokh@usm.my

Postgradute Student, Y.C. Kiu

Geophysics Section, School of Physics, 11800 Universiti Sains Malaysia, Penang, Malaysia. e-mail: kyapc@hotmail.com

Postgraduate Student, Nur Azwin Ismail

Geophysics Section, School of Physics, 11800 Universiti Sains Malaysia, Penang, Malaysia. e-mail:nurazwinismail@yahoo.com

 

 ABSTRACT

Seismic refraction is one of the geophysical methods that is effective to detect the depth of bedrock. A study was done within the area of Bukit Bunuh, Lenggong, Perak, utilizing the seismic refraction method using ABEM MK8, 24 channel seismograph. Seismic sections generally show a two layer case. The first layer with velocity 328-1100m/s predominantly consists of alluvium mix with gravel to forms an overburden. The second layer with velocity > 1850m/s is represents by granitic bedrock with various depths and undulating. Based on bedrock topography contour map, an area of low elevated bedrock topography (40-70m MSL) surrounded by highly uplifted bedrock (>90m MSL) is identified. This area is suggested to be a possible impact crater due to its bowl-like shape (simple crater).

Keywords: Seismic refraction, Bukit Bunuh, bedrock topography, impact crater.

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