Advertisement

Journal of Seismology

, Volume 6, Issue 2, pp 153–161 | Cite as

Source process of the southeast Beni-Suef, northern Egypt earthquake Using Empirical Green's Function Technique

  • Ali K. Abdel-Fattah
  • Ahmed Badawy
Article

Abstract

The rupture process of a moderateearthquake (ML∼4.9) occurred southeastBeni-Suef, northern Egypt was analyzed. Thecharacterization of the rupture process andsource properties were extracted fromstudying the relative moment rate function(RMRF). RMRFs were retrieved bydeconvolution of small aftershock recordsusing an inversion procedure for onlyP-wave part of the records.Although, this event is a moderateearthquake, its RMRFs exhibitedcomplexity and directivity of the rupturebehavior. The deconvolution pulses reflectthree subevents or more. The detailedanalysis of the distinct subevents revealedgross temporal and spatial characteristicsof the rupture propagation. The azimuthalvariation in the time delay of thesubevents with respect to the initiationrupture indicates that the subevents arelocated at 0.85 ± 0.17 and3.5 ± 0.07 km in directions of320° ± 45° and330° ± 15° with rupturevelocities 3.4 ± 0.45 and4.0 ± 0.7 km/sec, respectively. Thismeans that the rupture is predominatelypropagated toward the North. Estimation ofthe rupture direction was combined withP-wave focal mechanism to identify thefault plane for the initial rupture ofmainshock.Source parameters were calculated for eachdistinct subevent, including seismicmoments 8.53E14 to 6.80E15 Nm, fault radii713 to 1800 m and stress drops 0.725 to2.932 MPa. The large estimated stress dropfor the main subevent reflects failureasperity.

moment rate function relative location rupture propagation source parameters 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Abdel-Fattah, A.K., 1999, Source characteristics of the 28th January 1999 Nagano earthquake, Japan, IISEE 35, 45-57.Google Scholar
  2. Badawy, A., 1995, Source parameters and tectonic implications of recent Sinai (Egypt) earthquakes, Acta Geod. Geoph. Hung. 30, 349-361.Google Scholar
  3. Badawy, A., 1996, Seismicity and Kinematic Evolution of the Sinai Plate, Ph D thesis, pp. 115, L. Eötvös Univ. Budapest.Google Scholar
  4. Badawy, A., 1998, Earthquake hazard analysis in northern Egypt, Acta Geod. Geoph. Hung. 33(2-4), 341-357.Google Scholar
  5. Badawy, A., 2001, The present-day stress field in Egypt. Annali di Geofisica 44(3): 557-570.Google Scholar
  6. Badawy, A. and Abdel-Fattah, A.K., 2001, Source parameters and fault plane determinations of the 28 December, 1999 northeastern Cairo earthquakes, Tectonophysics 343(1-2): 63-77.Google Scholar
  7. Badawy, A. and Abdel-Fattah, A.K., 2002, Analysis of the southeast Beni-Suef, northern Egypt earthquake sequence, J. Geodynamics 33(3) (in press).Google Scholar
  8. Badawy, A. and Horváth, F., 1999a, Seismicity of the Sinai subplate region: Kinematic implications, J. Geodynamics 27, 451-468.Google Scholar
  9. Badawy, A. and Horváth, F., 1999b, Sinai subplate and kinematic evolution of the northern Red Sea, J. Geodynamics 27, 433-450.Google Scholar
  10. Badawy, A. and Mónus, P., 1995, Dynamic source parameters of the 12th October, 1992 earthquake, Cairo, Egypt, J. Geodynamics 20, 99-109.Google Scholar
  11. Boatwright, J., 1980, A spectral theory for circular seismic sources: simple estimates of source dimension, dynamic stress drop and radiated energy, Bull. Seism. Soc. Am. 70, 1-28.Google Scholar
  12. Brune, J., 1970, Tectonic stress and the spectra of seismic shear waves from earthquakes, J. Geophys. Res. 75, 4997-5009.Google Scholar
  13. Brune, J., 1971, Correction, J. Geophys. Res. 76, 5002.Google Scholar
  14. DiBona, M. and Boatwright, J., 1989, Single-station decomposition of seismograms for subevent time history, Geophy. J. Inter. 105, 103-117.Google Scholar
  15. Ellsworth, W.L. and Beroza, G.C., 1995, Seismic evidence for an earthquake nucleation phase, Science 268, 851-855.Google Scholar
  16. Frankel, A., Fletcher, J., Vernon, F., Haar, L., Berge, J., Hanks, T. and Brune, J., 1986, Rupture characteristics and tomographic imaging of ML = 3 earthquakes near Azna southern California, J. Geophys. Res. 91, 12633-12650.Google Scholar
  17. Hadley, D.M. and Helmberger, D.V., 1980, Simulation of strong ground motion, Bull. Seism. Soc. Am. 70, 617-630.Google Scholar
  18. Hartzell, S.H., 1978, Earthquake aftershocks as Green's functions, Geophys. Res Lett. 5, 1-4.Google Scholar
  19. Irikura, K. and Muramatu, I., 1982, Synthesis of strong ground motions during large earthquakes, Bull. Disaster. Prev. Res. Inst., Kyoto Univ. 33, 63-104.Google Scholar
  20. Kanamori, H., 1979, A semi-empirical approach to prediction of long-period ground motions from great earthquakes, Bull. Seism. Soc. Am. 69, 1645-1670.Google Scholar
  21. Lawson, C.L. and Hanson, R.J., 1974, Solving Least Squares Problems, Prentics-Hall, Inc., New Jersey.Google Scholar
  22. Li, Y. and Thurber, C.H., 1988, Source properties of two microearthquakes in Kilauea volcano, Hawaii, Bull. Seism. Soc. Am. 78, 1123-1132.Google Scholar
  23. Li, Y., Doll, C. and Toksoz, M.N., 1995, Source characterization and fault plane determination for MbLg = 1.2 to 4.4 earthquakes in the Charlevoix Seismic Zone, Quebec, Canada, Bull. Seism. Soc. Am. 85, 1604-1621.Google Scholar
  24. Mori, J., 1993, Fault plane determinations for three small earthquakes along San Jacinto fault California: search for cross faults, J. Geophy. Res. 98, 17711-17722.Google Scholar
  25. Mori, J. and Frankel, A., 1990, Source parameters for small events associated with the 1986 North Palm Springs, California, earthquake determined using empirical Green's functions, Bull. Seism. Soc. Am. 80, 278-295.Google Scholar
  26. Mueller, C., 1985, Source pulse enhancement by deconvlution of an empirical Green's function, Geophys. Res. Lett. 12, 33-36.Google Scholar
  27. Remote Sensing Center, 1980, Structural Lineaments map of Egypt, Northerneast Sheet, scale 1:1 000 000, Based on Landsat Satellite Imagery Interpretation and Field Investigations, Academy of Scientific Research and Technology, Cairo, Egypt. Oklahoma State Univ. Oklahoma U.S.A.Google Scholar
  28. Remote Sensing Center, 1990, Space Atlas of Misr. Vol. 1, sheet No. NH36A, Academy of Scientific Research and Technology, Cairo, Egypt.Google Scholar
  29. Savage, J.C. and Hasegawa, H.S., 1964, Some properties of tensile inferred from elastic wave radiation, J. Geophys. Res. 69, 2091-2106.Google Scholar
  30. Suetsugu, D., 1998, Practice on Source Mechanism, IISEE Lecture note, 104 pp. Tsukuba, Japan.Google Scholar
  31. Wu, F. and Kanamori, H., 1973, Source mechanism of the February 4, 1965 Rate Island earthquake, J. Geophys. Res. 78, 6082-6092.Google Scholar
  32. Xie, J., Liu, Z., Herrmann, R. and Cranswick, E., 1991, Source processes of three aftershocks of the 1983 Goodnow, New York, earthquake: high resolution images of small symmetric rupture, Bull. Seism. Soc. Am. 81, 818-843.Google Scholar

Copyright information

© Kluwer Academic Publishers 2002

Authors and Affiliations

  • Ali K. Abdel-Fattah
    • 1
  • Ahmed Badawy
    • 1
  1. 1.National Research Institute of Astronomy and GeophysicsHelwan, CairoEgypt

Personalised recommendations