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Sub-surface geometry of Ar Rika and Ruwah faults from gravity and magnetic surveys

Authors
  • Mogren, S.1
  • Al-Amri, A. M.1
  • Al-Damegh, K.2
  • Fairhead, D.3
  • Jassim, S.4
  • Algamdi, A.2
  • 1 King Saud University, Geology Department, College of Sciences, Riyadh, Saudi Arabia , Riyadh (Saudi Arabia)
  • 2 King Abdulaziz City for Science and Technology, Riyadh, Saudi Arabia , Riyadh (Saudi Arabia)
  • 3 University of Leeds, Earth Sciences Department, Leeds, England , Leeds (United Kingdom)
  • 4 GETECH, Leeds, England , Leeds (United Kingdom)
Type
Published Article
Journal
Arabian Journal of Geosciences
Publisher
Springer-Verlag
Publication Date
Jul 02, 2008
Volume
1
Issue
1
Pages
33–47
Identifiers
DOI: 10.1007/s12517-008-0003-3
Source
Springer Nature
Keywords
License
Yellow

Abstract

Ten global positioning system (GPS)–gravity profiles were conducted to provide sub-surface geometry of two sections of the Najd Fault System (NFS) Ruwah and Ar Rika faults, six in the Afif and four in the Al Muwayh area about 500 and 650 km west of Riyadh, respectively. GPS surveys were collected in differential GPS (DGPS) mode, allowing a large area to be covered in limited time. DGPS is utilized for the advantages of accuracy, economy, and speed. Output DGPS location coordinates were used in free-air and Bouguer reductions; terrain corrections were applied using a 3-arcsecond digital elevation model; finally, isostatic and decompensative corrections were applied. Integration of the resulting decompensative isostatic residual anomalies and aeromagnetic map has mapped the NFS very accurately. Modeling the gravity field crossing the Ruwah fault zone revealed that it is associated with low gravity anomalies probably due to a complex of lower density crushed rocks and modeled the geometry of the subsurface structure of Ar Rika fault as an inclined fault with reverse movement that would imply a compression component (post-dated the shearing) parallel to the plane of the cross-section.

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