Detection of Qademah Fault using Geophysical Methods Sherif Hanafy King Abdullah University of science and Technology KAUST 7 th Gulf Seismic Forum 2012 24 January 2012 Outline Motivations Study Area ID: 771035
Download Presentation The PPT/PDF document "Detection of Qademah" is the property of its rightful owner. Permission is granted to download and print the materials on this web site for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.
Detection of Qademah Fault using Geophysical Methods Sherif HanafyKing Abdullah University of science and Technology (KAUST) 7 th Gulf Seismic Forum 2012 24 January 2012
Outline Motivations Study Area Data Acquisition (Resistivity and Seismic) Data Processing and Interpretation Resistivity Seismic Summary and Future Work
Outline Motivations Study Area Data Acquisition (Resistivity and Seismic) Data Processing and Interpretation Resistivity Seismic Summary and Future Work
Motivations Demonstrate the capability of geophysics to detect shallow subsurface faultsIs Qademah fault exists? Track the Qademah fault (if exist) trenching and dating ancient earthquakes at Qademah fault to assess size and recurrence intervals
Outline Motivations Study Area Data Acquisition (Resistivity and Seismic) Data Processing and Interpretation Resistivity Seismic Summary and Future Work
KAUST Qadema Fault Study Area
Data Acquisition (Resistivity and Seismic)
Data Acquisition (Resistivity and Seismic)
Topography
Outline Motivations Study Area Data Acquisition (Resistivity and Seismic) Data Processing and Interpretation Resistivity Seismic Summary and Future Work
Data Acquisation ResistivityEquipment: Syscal R2 No. of Profiles: 2 No. of Nodes: 64 Node Interval: 5 m Profile Length: 315 m Array Type: Wenner Seismic Equipment: Geometrics (NZXP + Geode) No of Profiles: 1 No. of shots: 109 Shot Interval: 3 m No. of Receivers: 109 Receiver Interval: 3 m Profile Length: 324 m
Outline Motivations Study Area Data Acquisition (Resistivity and Seismic) Data Processing and Interpretation Resistivity Seismic Summary and Future Work
Resistivity ResultsSite # 1 Raw Data No. of Nodes: 64 Node Interval: 5 m Profile Length: 315 m Array Type: Wenner
Resistivity ResultsSite # 1 Inverted Data S Sabkha CW Colluvial Wedge F Fan SG Sand-silt-gravel LS Limestone
Resistivity ResultsSite # 2 Raw Data No. of Nodes: 64 Node Interval: 5 m Profile Length: 315 m Array Type: Wenner
Resistivity ResultsSite # 2 Inverted Data S Sabkha CW Colluvial Wedge F Fan SG Sand-silt-gravel LS Limestone
Outline Motivations Study Area Data Acquisition (Resistivity and Seismic) Data Processing and Interpretation Resistivity Seismic Summary and Future Work
No. of shots: 109Shot Interval: 3 mNo. of Receivers: 109 Receiver Interval: 3 mProfile Length: 324 m CSG # 60 0 0.25 0 324 X (m) Time (s) Common Shot Gather No of TT: 11881 TT passes Reci . Test: 9488 No. of TT rejected: 2393 No. of Iterations: 40
Refraction Tomogram
Reflection Stacked Section
Reflection Stacked Section
Result Summary
Outline Motivations Study Area Data Acquisition (Resistivity and Seismic) Data Processing and Interpretation Resistivity Seismic Summary and Future Work
Summary and Future Work Resistivity and seismic methods used to detect the Qademah fault One colluvial wedge is shown on both ERT and refraction tomogram Reflection stacked section shows the Qademah fault and the associated antithetic fault(s)
Summary and Future Work The Qademah Fault will be tracked to the south with Seismic Resistivity EM and possibly GPR A trench will be made at Qademah fault to date the colluvial wedge If more than one colluvial wedge is found, then we will be able to find the fault recurrence.
Thank You