Magnetic study of impact structure at bukit bunuh lenggong perak, Malaysia

Abdul Rahim Samsudin, Siti Hafizah Ramli, Mokhtar Saidin, Shyeh Sahibul Karamah

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

A magnetic survey was conducted at Bukit Bunuh Lenggong, Perak which involved an area of about 1600 square km by using two proton precession magnetometers. One of the magnetometer was located at the base station for diurnal correction purposes and the other was used for magnetic field data measurement. The total magnetic field intensity readings were taken at 580 stations in the study area with spacing between the stations of about 100 to 1000 meters. The magnetic readings at the base station were recorded manually for every 10 minutes time interval. General geology of the study area was obtained from previous geological report and field observation during the extensive magnetic survey. The study area comprises of mainly granite with schist, limestone, alluvium and some boulders of suevite. Oasis Montaj software was used for data processing and filtering to obtain the total field magnetic anomaly map which includes its derivative maps such as Reduction to Equator (RTE), Low-Pass Filter (LPF), High-Pass Filter (HPF) and Total Horizontal Derivative (THD) maps. The Oasis Montaj software was also used to obtain two dimensional model of the subsurface structure. The magnetic anomaly and its derivative maps were studied to determine their possible relation with the meteorite impact structure at the study area. A pattern of circular distribution of magnetic anomaly in the study area was interpreted to be the outer rim's boundary of the impact crater. Negative magnetic anomaly appears to be dominated within the Bukit Bunuh area which exhibits a subdued negative magnetic response, implying demagnetization due to the impact. The magnetic anomaly map shows a diameter of approximately 5 km for the impat crater and it was successfully modeled as a 2-D complex crater with maximum depth of less than 600m.

Original languageEnglish
Pages (from-to)1317-1325
Number of pages9
JournalElectronic Journal of Geotechnical Engineering
Volume19 F
Publication statusPublished - 2014

Fingerprint

impact structure
magnetic anomaly
crater
magnetic survey
oasis
Magnetometers
magnetometer
Magnetic fields
Derivatives
Base stations
suevite
Meteorites
magnetic field
filter
software
High pass filters
Demagnetization
Granite
demagnetization
Low pass filters

Keywords

  • Earth magnetic field
  • Impact crater
  • Iron deposit
  • Magnetic anomaly

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology

Cite this

Magnetic study of impact structure at bukit bunuh lenggong perak, Malaysia. / Samsudin, Abdul Rahim; Ramli, Siti Hafizah; Saidin, Mokhtar; Karamah, Shyeh Sahibul.

In: Electronic Journal of Geotechnical Engineering, Vol. 19 F, 2014, p. 1317-1325.

Research output: Contribution to journalArticle

Samsudin, Abdul Rahim ; Ramli, Siti Hafizah ; Saidin, Mokhtar ; Karamah, Shyeh Sahibul. / Magnetic study of impact structure at bukit bunuh lenggong perak, Malaysia. In: Electronic Journal of Geotechnical Engineering. 2014 ; Vol. 19 F. pp. 1317-1325.
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