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Induced Seismicity at Lake Aswan Reservoir, Egypt Awad Hassoup

Induced Seismicity at Lake Aswan Reservoir, Egypt Awad Hassoup Head of the National Seismic Network Laboratory. The seismological activity in (NRIAG). Established: 1903 Scientific Activity: 1898. A single station at Helwan since 1898. Helwan. EGYPT.

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Induced Seismicity at Lake Aswan Reservoir, Egypt Awad Hassoup

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  1. Induced Seismicity at Lake Aswan Reservoir, Egypt Awad Hassoup Head of the National Seismic Network Laboratory

  2. The seismological activity in (NRIAG) • Established: 1903 • Scientific Activity: 1898

  3. A single station at Helwan since 1898 Helwan EGYPT

  4. Seismicity during the period from 1900 -1962

  5. The National Seismological Network

  6. Field site of a broad band station

  7. The accelerographs Network

  8. Field site of an accelerograph station

  9. Communication system at the main center of the National Seismological Network

  10. Recording system at the main center of the Egyptian National Seismological Network

  11. Seismogram record by ENSN

  12. Seismicity map of Egypt 1997~2007.

  13. Distribution of the telemetry earthquake recording stations of Abu Dabbab area. Case study: Seismicity monitoring using the portable array at Abu Dabbab area, Red Sea coast

  14. Figure (3.3): An example of the recorded seismogram at Abu Dabbab stations, in 01/07/2004.

  15. Lake Aswan

  16. Geology and tectonics of the Aswan seismically-active area, Cross sections and borehole location (Issawi, 1969 and 1978).

  17. MM intensity distribution of the 1981 Lake Aswan earthquake M=5.7.

  18. Lake Aswan Seismicity from 1982 to 1983

  19. Lake Aswan Seismicity from 1984 to 1987

  20. Lake Aswan Seismicity from January to May 1987 Seismic quiescence observation

  21. Lake Aswan Seismicity in July 1987

  22. Lake Aswan Seismicity from 1988 to 1991

  23. Aswan Lake Seismicity from 1992 to 1995

  24. Lake Aswan Seismicity from 1996 to 1999

  25. Lake Aswan Seismicity from April to July 2004 Seismic quiescence observation

  26. Lake Aswan Seismicity from August to December 2004

  27. Lake Aswan Seismicity from January to April 2007 Seismic quiescence observation

  28. Lake Aswan Seismicity in April 2007

  29. Lake Aswan Seismicity from 2000 to 2003

  30. Lake Aswan Seismicity from 2004 to 2007

  31. Lake Aswan Seismicity from 1981 to 2007

  32. Depth distribution of Lake Aswan Seismicity and P-wave velocity structure

  33. Waveform study of the June 1987 swarm sequence in Aswan

  34. Measuring the time delay between the master and sub-events by applying cross correlation where f1(t) is for the master event and f2 (t) is for the slave event

  35. Relocation of the swarm sequence

  36. Temporal seismicity and water level variations in Lake Aswan 1965~ 1986

  37. Temporal seismicity and water level variations in Lake Aswan 1982~ 2007

  38. Amplitude Fourier spectrum correlation between the temporal seismicity and water level variations in Lake Aswan 1982~ 1989, all events

  39. Amplitude Fourier spectrum correlation between the temporal seismicity and water level variations in Lake Aswan 1982~ 1989, Shallow and deep events Shallow sequence Deep sequence (focal depths < 10 km) (focal depths from 10 to 30 km)

  40. Temporal seismicity and water level variations in Lake Aswan 1982 ~83

  41. Temporal seismicity and water level variations in Lake Aswan 1987

  42. Temporal seismicity and water level variations in Lake Aswan May 1999 ~ July 2002 • The first burst occurred in June-July, 1999 during the seasonal decreasing of the water level. • The second burst occurred in October-November 2000 to January-February 2001 accompanied seasonal crest of water level. • The third burst of activity occurred from the end of February to July 2002

  43. Temporal seismicity and water level variations in Lake Aswan 2007

  44. Fault plane solution of earthquakes in Aswan Marawa fault (E-W) Seiyal fault (E-W) Khor El-Ramla (N-S) April- 2007

  45. 1D Velocity model of Aswan Dam region, used in spectral ray-tracer.

  46. Fault plane double-couple solution of earthquakes in Aswan

  47. Results and conclusion 1- Earthquakes tend to be clusters in swarm sequences in shallow seismic zone 2- The seismic quiescence is observed in Aswan Seismicity 3- The correlation between seismicity and water level fluctuation is evident in the Lake Aswan reservoir 4- The seismicity is correlated with geological fault traces in general. There are seismic segment trends occupying a nearby area to the Aswan High Dam.

  48. THANK YOU THANK YOU THANK YOU

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