1. Detection of Qademah Fault using Geophysical Methods
Sherif Hanafy
King Abdullah University of science and Technology (KAUST)
7th Gulf Seismic Forum 2012
24 January 2012

2. Outline Motivations Study Area
Data Acquisition (Resistivity and Seismic)
Data Processing and Interpretation
Resistivity
Seismic
Summary and Future Work

3. Outline Motivations Study Area
Data Acquisition (Resistivity and Seismic)
Data Processing and Interpretation
Resistivity
Seismic
Summary and Future Work

4. Motivations
Demonstrate the capability of geophysics to detect shallow subsurface faults
Is Qademah fault exists?
Track the Qademah fault (if exist)
trenching and dating ancient earthquakes at Qademah fault to assess size and recurrence intervals

5. Outline Motivations Study Area
Data Acquisition (Resistivity and Seismic)
Data Processing and Interpretation
Resistivity
Seismic
Summary and Future Work

6. Study Area
KAUST
Qadema Fault

7. (Resistivity and Seismic)
Data Acquisition
(Resistivity and Seismic)

8. (Resistivity and Seismic)
Data Acquisition
(Resistivity and Seismic)

9. Topography

10. Outline Motivations Study Area
Data Acquisition (Resistivity and Seismic)
Data Processing and Interpretation
Resistivity
Seismic
Summary and Future Work

11. Data Acquisation Seismic Resistivity Equipment: Geometrics
(NZXP + Geode)
No of Profiles:
No. of shots:
Shot Interval: m
No. of Receivers:
Receiver Interval: 3 m
Profile Length: m
Resistivity
Equipment: Syscal R2
No. of Profiles: 2
No. of Nodes:
Node Interval: 5 m
Profile Length: m
Array Type: Wenner

12. Outline Motivations Study Area
Data Acquisition (Resistivity and Seismic)
Data Processing and Interpretation
Resistivity
Seismic
Summary and Future Work

13. Resistivity Results Site # 1
No. of Nodes:
Node Interval: 5 m
Profile Length: m
Array Type: Wenner
Raw Data

14. Resistivity Results Site # 1
S Sabkha CW Colluvial Wedge
F Fan SG Sand-silt-gravel
LS Limestone
Inverted Data

15. Resistivity Results Site # 2
No. of Nodes:
Node Interval: 5 m
Profile Length: m
Array Type: Wenner
Raw Data

16. Resistivity Results Site # 2
S Sabkha CW Colluvial Wedge
F Fan SG Sand-silt-gravel
LS Limestone
Inverted Data

17. Outline Motivations Study Area
Data Acquisition (Resistivity and Seismic)
Data Processing and Interpretation
Resistivity
Seismic
Summary and Future Work

18. Common Shot Gather CSG # 60 Time (s) X (m) No. of shots: 109
0.25
324
X (m)
Time (s)
No. of shots:
Shot Interval: m
No. of Receivers:
Receiver Interval: 3 m
Profile Length: m
No of TT:
TT passes Reci. Test: 9488
No. of TT rejected:
No. of Iterations:

19. Refraction Tomogram

20. Reflection Stacked Section

21. Reflection Stacked Section

22. Result Summary

23. Outline Motivations Study Area
Data Acquisition (Resistivity and Seismic)
Data Processing and Interpretation
Resistivity
Seismic
Summary and Future Work

24. 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)

25. 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.

26. Thank You