Geophysical evidences of a possible meteorite impact crater at Langkawi Island, Kedah, Malaysia

Abdul Rahim Samsudin, Nur Suraya Ahmad, Nur Dalilah Johari, Umar Hamzah

Research output: Contribution to journalArticle

Abstract

Previous investigation of geology and lineaments study using aerial photograph, clearly indicates a semi-circular rim structure of a possible remnant of impact crater in the main island of Langkawi, Kedah. A subsequent study of regional gravity survey produced a negative low gravity anomaly within the impact structure. An integrated geophysical study employing gravity and magnetic surveys was conducted to determine the geometry and subsurface geological structures of the impact crater. The gravity and magnetic readings were measured using Scintrex CG-5 gravity meter and proton precession magnetometers respectively. A total of 127 gravity stations and 226 magnetic stations were established around the interpreted impact crater covering an area of approximately 35 square km. Both the gravity and magnetic anomaly data were processed and analysed using Oasis Montaj (Geosoft software). The bouguer gravity map shows relatively low negative anomaly with rounded shaped contour around the suspected crater area. This anomaly was interpreted as a remnant of meteorite impact structure with distorted shaped crater in the study area. The bouguer anomaly map shows that the structure of the crater has a diameter of approximately 1.5 km. The impact structure has been modelled as a simple type crater in order to determine the thickness of the low density sedimentary fill. The magnetic anomaly map does not show direct correlation with structure of the impactcrater, however there is an indication of subdued magnetic anomaly in the region within the impact crater.

Original languageEnglish
Pages (from-to)4741-4749
Number of pages9
JournalElectronic Journal of Geotechnical Engineering
Volume19
Issue numberR
Publication statusPublished - 2014

Fingerprint

Meteorites
meteorite
crater
Gravitation
impact structure
magnetic anomaly
gravity
gravity survey
gravity anomaly
Gravimeters
anomaly
magnetic survey
Magnetometers
Bouguer anomaly
Geology
oasis
precession
magnetometer
lineament
geological structure

Keywords

  • Geophysical evidences
  • Gravity method
  • Impact crater
  • Langkawi

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology

Cite this

Geophysical evidences of a possible meteorite impact crater at Langkawi Island, Kedah, Malaysia. / Samsudin, Abdul Rahim; Ahmad, Nur Suraya; Johari, Nur Dalilah; Hamzah, Umar.

In: Electronic Journal of Geotechnical Engineering, Vol. 19, No. R, 2014, p. 4741-4749.

Research output: Contribution to journalArticle

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