Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010geoji.183.1052p&link_type=abstract
Geophysical Journal International, Volume 183, Issue 2, pp. 1052-1060.
Astronomy and Astrophysics
Astronomy
Seismic Attenuation, Wave Scattering And Diffraction, Wave Propagation
Scientific paper
We have analysed 202 seismograms recorded at 10 seismic stations in the northeast (NE) India region to infer the frequency-dependent attenuation characteristics of both P and S waves, in the frequency range from 1.5 to 24 Hz and in the distance range from 30 to 100km. We used extended coda-normalization method to determine the attenuation of P wave (Q-1P) and S wave (Q-1S). The results show that both P and S waves undergo a strong attenuation along ray paths. The values of Q-1P and Q-1S, corresponding to spectral amplitude decays, show strong frequency dependence and are expressed as Q-1P = (0.035 +/- 0.014)f-(0.96+/-0.01) and Q-1S = (0.014 +/- 0.006)f-(0.94+/-0.03), respectively, in 1.5-24 Hz. The ratio Q-1P/Q-1S is found to be larger than unity for the whole frequency range. The high frequency dependence of both P- and S waves indicate the highest attenuation among the world at lower frequencies.
Padhy Simanchal
Subhadra N.
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