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Journal of Seismology

, Volume 5, Issue 2, pp 157–179 | Cite as

Scattering attenuation and intrinsic absorption using uniform and depth dependent model – Application to full seismogram envelope recorded in Northern Chile

  • Mitsuyuki Hoshiba
  • Andreas Rietbrock
  • Frank Scherbaum
  • Hisashi Nakahara
  • Christian Haberland
Article

Abstract

Two seismic wave attenuation factors, scatteringattenuation Qs-1 and intrinsicabsorption Qi-1 are measured using theMultiple Lapse Time Window (MLTW) analysis method forthree different frequency bands, 1–2, 2–4, and 4–8 Hz.Data from 54 temporally deployed seismic stationslocated in northern Chile are used. This methodcompares time integrated seismic wave energies withsynthetic coda wave envelopes for a multiple isotropicscattering model. In the present analysis, the waveenergy is assumed to decay with distance in proportionto1/GSF·exp(- (Qs-1+Qi-1)·ω r/v), where r, ω and v are the propagationdistance, angular frequency and S wave velocity,respectively, and GSF is the geometricalspreading factor. When spatial uniformity of Qs-1, Qi-1 and v isassumed, i.e. GSF = 4πr2, theestimates of the reciprocal of the extinction length,Le-1 (= (Qs-1+Qi-1)·ω/v), are 0.017,0.012 and 0.010 km-1, and those of the seismicalbedo, B0 (= Qs-1/ (Qs-1+Qi-1)), are 0.48, 0.40and 0.34 for 1–2, 2–4 and 4–8 Hz, respectively, whichindicates that scattering attenuation is comparable toor smaller than intrinsic absorption. When we assumea depth dependent velocity structure, we also findthat scattering attenuation is comparable to orsmaller than intrinsic absorption. However, since thequantitative estimates of scattering attenuationdepend on the assumed velocity structure (strength ofvelocity discontinuity and/or Moho depth), it isimportant to consider differences in velocitystructure models when comparing attenuation estimates.

absorption Andes Chile layered media lithosphere Q scattering seismic coda seismic wave propagation 

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Copyright information

© Kluwer Academic Publishers 2001

Authors and Affiliations

  • Mitsuyuki Hoshiba
  • Andreas Rietbrock
  • Frank Scherbaum
  • Hisashi Nakahara
  • Christian Haberland

There are no affiliations available

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