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أ.د. سعد بن مقرن بن عبدالعزيز المقرن

Professor

عضو هيئة التدريس

كلية العلوم
كلية العلوم مبنى 4 الدور الارضي معمل الجاذبية المطلقة
المنشورات
مقال فى مجلة
2008

Sub-surface geometry of Ar Rika and Ruwah faults from Gravity and Magnetic Surveys

, S. Mogren1, A. S. Al-Amri, K Al-Damegh, D. Fairhead, S. Jassim and A. Algamdi . 2008

Gravity Magnetic Arabian Shield Tectonics Isostatic Najd

en 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.

مجلة/صحيفة
Arabian Journal of Geosciences
مزيد من المنشورات
publications

The 2009 earthquake-swarm in the Al-Ays volcanic zone in Harrat-Lunayyir in
NW Saudi-Arabia is unique because of its intense character and focal-depth
distribution at two depth bands (…

بواسطة Basab Mukhopadhyay , Saad Mogren , Manoj Mukhopadhyay & Sujit Dasgupta
2013