Pure and Applied Geophysics

, Volume 169, Issue 1–2, pp 89–100 | Cite as

Attenuation of Coda Waves in the Saurashtra Region, Gujarat (India)

  • Babita Sharma
  • Dinesh Kumar
  • S. S. Teotia
  • B. K. Rastogi
  • Arun K. Gupta
  • Srichand Prajapati
Article

Abstract

The attenuation characteristics based on coda waves of two areas—Jamnagar and Junagarh of Saurashtra, Gujarat (India)—have been investigated in the present study. The frequency dependent relationships have been developed for both the areas using single back scattering model. The broadband waveforms of the vertical components of 33 earthquakes (Mw 1.5–3.5) recorded at six stations of the Jamnagar area, and broadband waveforms of 68 earthquakes (Mw 1.6–5) recorded at five stations of the Junagarh area have been used for the analysis. The estimated relations for the Junagarh area are: Qc = (158 ± 5)f(0.99±0.04) (lapse time : 20 s), Qc = (170 ± 4.4)f(0.97±0.02) (lapse time : 30 s) and Qc = (229 ± 6.6)f(0.94±0.03) (lapse time : 40 s) and for the Jamnagar area are: Qc = (178 ± 3)f(0.95±0.05) (lapse time : 20 s), Qc = (224 ± 6)f(0.98±0.06) (lapse time : 30 s) and Qc = (282 ± 7)f(0.91±0.03) (lapse time : 40 s). These are the first estimates for the areas under consideration. The Junagarh area appears to be more attenuative as compared to the Jamnagar area. The increase in Qc values with lapse time found here for both the areas show the depth dependence of Qc as longer lapse time windows will sample larger area. The rate of decay of attenuation (Q−1) with frequency for the relations obtained here is found to be comparable with those of other regions of the world though the absolute values differ. A comparison of the coda-Q estimated for the Saurashtra region with those of the nearby Kachchh region shows that the Saurashtra region is less heterogeneous. The obtained relations are expected to be useful for the estimation of source parameters of the earthquakes in the Saurashtra region of Gujarat where no such relations were available earlier. These relations are also important for the simulation of earthquake strong ground motions in the region.

Keywords

Saurashtra Coda-Q attenuation frequency lapse time 

References

  1. Aki K. (1969), Analysis of seismic coda of local earthquakes as scattered waves, J. Geophys. Res., 74, 615–631.Google Scholar
  2. Aki K. (1980), Attenuation of shear waves in the lithosphere for frequencies from 0.05 to 25 Hz, Phys. Earth Planet Inter., 21, 50–60.Google Scholar
  3. Aki K. and Chouet, B. (1975), Origin of the Coda waves: Source attenuation and Scattering effects, J. Gophys. Res., 80, 3322–3342.Google Scholar
  4. Akinci A., Taktak A.G. and Ergintav S. (1994), Attenuation of coda waves in Western Anatolia, Phys. Earth Planet Inter., 87, 155–165.Google Scholar
  5. Babita Sharma, S.S. Teotia, Kumar D. (2007), Attenuation of P, S and coda waves in Koyna region, India, J. Seismo., 11, 327–344.Google Scholar
  6. Babita Sharma, Arun K. Gupta, D. Kameswari Devi, Dinesh Kumar, S.S.Teotia and B. K. Rastogi (2008) Attenuation of High-Frequency Seismic Waves in Kachchh Region, Gujarat, India, Bull. of Seismological Society of America, Vol. 98, No. 5, pp, 2325–2340.Google Scholar
  7. Babita Sharma, S. S. Teotia and Dinesh Kumar (2009), Attenuation of P- and S-waves in the Chamoli region, Himalaya, India”, PAGEOPH, doi:10.1007/s00024-009-0527-9.
  8. Biswas S. K., 1987. Regional tectonic framework, structure and evolution of the Western marginal basins of India, Tectonophysics, 135, 307–327.Google Scholar
  9. Brune, J.N. (1970), Tectonic stress and spectra of shear waves from earthquakes, J. Geophy. Res. 75 4997–5009.Google Scholar
  10. Catherine R.D.W. (1990), Estimation of Q in Eastern Canada using coda waves, Bull. Seism. Soc. Am., 80, 411-429.Google Scholar
  11. Chandra U. (1977), Earthquakes of Peninsular India-A Seismotectonic study, Bull. Seism. Soc. Am., 67, 1387–1413.Google Scholar
  12. Chopra, S., Rao, K. M., Sairam, B., Kumar, S., Gupta, A.K., Patel, H., Gadhavi, M.S., and Rastogi, B.K. (2008) Earthquake swarm activities after rains in peninsular India and a case study from Jamnagaar, Geol.Soc.Ind., 72, 245–252.Google Scholar
  13. Gao L.S., Biswas, N.N., Lee L.C. and Aki K. (1983), Effects of multiple scattering on coda waves in three dimensional medium. Pure Appl. Geophys. 121 (1983), pp. 3–15.Google Scholar
  14. Gupta, S. C., A. Kumar, A. K. Shukla, G. Suresh, and P. R. Baidya (2006), CodaQ in the Kuchchh Basin, Western India using aftershocks of the Bhuj earthquake of January26, 2001, Pure Appl.Geophys. 163, no.8, 1583–1595.Google Scholar
  15. Gupta S.C., Ashwani Kumar, Singh V.N. Basu, S. (1996), Lapse-time dependence of Qc in the Garhwal Himalaya, Bull. Indian. Soc. Earthquake Technol., 33, 147–159.Google Scholar
  16. Gupta S.C. and Ashwani Kumar (2002) Seismic wave attenuation characteristics of three Indian regions. A comparative study, Current Science, 82, 407–413.Google Scholar
  17. Gupta S.C., Singh V.N. and Ashwani Kumar (1995), Attenuation of coda waves in the Garhwal Himalaya, India, Phys. Earth Planet. Inter., 87, 247–253.Google Scholar
  18. Hellweg, M., Spudich, P., Fletcher, J. B., and Baker, L. M. (1995), Stability of coda Q in the region of Parkfield, California: view from the U.S. geological survey Parkfield dense seis-mograph array. J. Geophys. Res., 100, 2089–2102.Google Scholar
  19. Ibáñez J.M, E. del Pezzo, F. de Miguel, M. Herraiz, G. Alguacil and J. Morales (1990), Depth dependent seismic attenuation in the Granada zone (Southern Spain). Bull. Seismol. Soc. Am. 80, pp. 1222–1234.Google Scholar
  20. Kanao M. and Ito K. (1991), Attenuation of S-waves and coda waves in the inner zone of southwestern Japan. Disaster Prev. Res. Inst., Kyoto Univ., Bull. 41 2, 356, pp. 87–107.Google Scholar
  21. Kumar A., Pandey A.D., Sharma M.L., Gupta S.C., Verma A.K. and Gupta B.K. (1997) Processing and preliminary interpretation of digital data obtained from telemetered seismic array in the Garhwal Himalaya, 10th Symp. of Earthquake Engineering, University of Roorkee, Roorkee, 141–152.Google Scholar
  22. Mandal P. and Rastogi B.K (1998), A frequency dependent relation of coda Qc for Koyna-Warna region, India, Pure and Applied Geophysics, 163–177.Google Scholar
  23. Mandal, P., Jainendra, Joshi, S., Kumar, S., Bhunia, R., and Rastogi, B.K. (2004), Low coda-Qc in the epicentral region of the 2001 Bhuj Earthquake of M w 7.7, Pure Appl. Geophys. 161, 1635–1654.Google Scholar
  24. Paul A., Gupta S.C., Pant C. C. (2003), Coda Q estimates for Kumaun Himalaya, Proc. Indian Acad. Sci., 112, 569–576.Google Scholar
  25. Pulli J.J. (1984), Attenuation in New England, Bull. Seism. Soc. Am., 74, 1149–1166.Google Scholar
  26. Rastogi B.K. (2003) Seismicity of Gujarat with special reference to Saurastra, abstract volume Group discussion on active Tectonics in western India, Vadodara March 20–21, pp 14–17.Google Scholar
  27. Rautian T.G., and Khalturin V.I. (1978), The use of the coda for the determination of the earthquake source spectrum, Bull. Seismol.Soc.Am., 68, 923–948.Google Scholar
  28. Rocker S.W., Tucker B., King J. and Hatzfeld D. (1982), Estimates of Q in central Asia as a function of frequency and depth using the coda of locally recorded earthquakes, Bull. Seismol.Soc.Am., 72, 129–149.Google Scholar
  29. Rovelli A. (1982), On the frequency dependence of Q in Friuli from short-period digital records. Bull. Seismol. Soc. Am. 72 (1982), pp. 2369–2372.Google Scholar
  30. Rastogi, B.K., S. Chopra, M.S. Gadhavi, H. Patel, S. Aggrawal, B. Sairam, A. K. Gupta, M.Chauhan and K.M. Bhatt (2008), Investigations of magnitude 5.0 Talala earthquake of November 6, 2007 in Junagadh district, ISR Tech. Rep 11, 1–31.Google Scholar
  31. Sato, H., (1984), Attenuation of envelope formation of three-component seismograms of small local earthquakes in randomly inhomogeneous lithosphere, J. Geophys. Res., 89, 1221–1241.Google Scholar
  32. Woodgold C. (1994), Coda-Q in Charlevoix, Quebec, Region. Lapse time dependence and Spatial and temporal comparisons. Bull. Seismol. Soc. Am. 84, pp. 1123–1131.Google Scholar

Copyright information

© Springer Basel AG 2011

Authors and Affiliations

  • Babita Sharma
    • 1
    • 2
  • Dinesh Kumar
    • 3
  • S. S. Teotia
    • 3
  • B. K. Rastogi
    • 2
  • Arun K. Gupta
    • 1
    • 2
  • Srichand Prajapati
    • 2
  1. 1.Ministry of Earth SciencesNew DelhiIndia
  2. 2.Institute of Seismological ResearchGandhinagarIndia
  3. 3.Department of GeophysicsKurukshetra UniversityKurukshetraIndia

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