Magnetic response signatures in defining impact crater at Bukit Bunuh, Lenggong, Perak, Malaysia
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Date
2014
Authors
Yap Chong, Kiu
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Abstract
Magnetic is a famous geophysical technique used to image nonlinearity subsurface structures due to variations of magnetic properties. The ground magnetic study is carried out to study the response of magnetic features for an impact crater. The local magnetic data acquired are processed using Microsoft Excel for data reduction. The residual values obtained are used to grid, plot and contour the magnetic residual map using Surfer 8 software. The study is divided into two stages which are regional and detail study. There are five interest areas with distinct circular patterns found from the regional study and is further investigated by detailed study. Faults and fractures are also delineated from the map that due to the irregularity of magnetic residual value over the area. The detailed study with smaller spacing successfully maps Bukit Bunuh impact crater. It is a complex crater with a rebound zone of positive magnetic anomaly value located at Bukit Bunuh. The crater rim extended 5 km outwards with a clear subdued zone and immediately surround by a positive magnetic residual crater rim zone. The results are well correlated with boreholes data and the range of local magnetic value is determined. Suevite boulders map distribution on the area also matches with the magnetic results with the aid of a schematic crater figure. The magnetic response of Bukit Bunuh showed an astonishing outcome with significant crater signatures in defining it.