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Estimation of attenuation characteristics of Aswan reservoir region, Egypt

Journal of Seismology volume 20, pages 79–92 (2016)Cite this article

Abstract

The attenuation characteristics of Aswan reservoir region in Egypt was estimated using microearthquakes records. Frequency-dependent attenuation characteristic of S wave was estimated using coda normalization method. The evaluated quality factor (Q s ) shows strong frequency dependence with its value increasing with increasing frequency. For Aswan region, the average frequency-dependent relation is given by Q s  = (34.2 ± 2.9)f(1.023 ± 0.107). The low values of Q s lie within those observed for seismically active regions of the world, although the study area is seismically moderately active and known to be a region where reservoir-induced seismicity occurs. The low value of Q s would mean that the medium is highly heterogeneous. Separation of intrinsic and scattering Q was carried out using estimated Q s values and values of coda Q (Q c ) estimated earlier by other workers from the same data set. It is observed from this that S and coda wave attenuation is primarily controlled by intrinsic attenuation at 1-Hz frequency. At higher frequencies, intrinsic and scattering attenuations contribute almost equally as seismic albedo at 1-Hz frequency is 0.04, and at higher frequencies, it varies between 0.34 and 0.55. Extinction length varies between 16.4 and 23.6 km. The frequency-dependent relationship for scattering Q (Q sc ) and intrinsic Q (Q i ) are Q sc  = (699.3 ± 334.5)f (0.13 ± 0.06) and Q i  = (52.9 ± 5.6)f (1.09 ± 0.03).

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Acknowledgments

We are thankful to the Director of NRIAG and the staff of Aswan network for their kind help and support. We are also thankful to Prof. J.R. Kayal and Mrs. Rashmi Pradhan for their help and support. Our sincerest thanks go to Elisabetta Giampiccolo and an anonymous reviewer who helped us in significantly improving the manuscript.

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Authors and Affiliations

  1. Department of Earth Sciences, IIT Roorkee, Roorkee, 247667, India

    S. Mukhopadhyay & Birinder Singh

  2. Aswan Earthquake Research Center, National Research Institute of Astronomy and Geophysics, P.O. Box 152, Aswan, Egypt

    H. Mohamed

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  1. S. Mukhopadhyay
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  2. Birinder Singh
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  3. H. Mohamed
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Correspondence to S. Mukhopadhyay.

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Mukhopadhyay, S., Singh, B. & Mohamed, H. Estimation of attenuation characteristics of Aswan reservoir region, Egypt. J Seismol 20, 79–92 (2016). https://doi.org/10.1007/s10950-015-9511-2

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Keywords

  • Aswan reservoir
  • Q s
  • Q i
  • Q sc