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Coda Q Estimates in the Andaman Islands Using Local Earthquakes

IR@C-MMACS: CSIR-Centre for Mathematical Modelling and Computer Simulation, Bangalore

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Title Coda Q Estimates in the Andaman Islands Using Local Earthquakes
 
Creator Parvez, Imtiyaz A
 
Subject Computational Seismology
 
Description The attenuation property of Andaman Island has been investigated analyzing coda waves from 57 local earthquakes in the magnitude range of 2.0–4.9, using the single backscattering model. These earthquakes waveforms, recorded on five broadband seismographs sited over the island from north to south during Nov. 2003 to March 2004, have been used to calculate the frequency dependent Coda Q (Qc) applying the time domain coda-decay method. The Coda Q, computed at central frequencies from (0.5–12) Hz and five-lapse time windows from 40 to 80 s, progressively increases from 105 f 0.88 in the north Andaman to 135 f 0.79 in the south Andaman with an average of 119 f 0.80. The average Qc values vary from 75 ± 42 at 0.5 Hz to 697 ± 54 at 12 Hz central frequency for 40 s lapse time window, while for 80 s lapse time window its variation is from 117 ± 38 at 0.5 Hz to 1256 ± 115 at 12 Hz. The Qc estimated at different lapse times manifests a significant variation from 122f 0.75 to 174f 0.73, corresponding to lapse time window lengths of 40 and 80 s, respectively. The variation of Qc with frequency, lapse time and also with the location of seismograph reflects the marked structural and compositional inhomogeneity with depth along the Andaman Islands. These observations are well correlated with the seismicity pattern and distinct high angle subduction beneath the island.
 
Publisher Springer
 
Date 2008-11-08
 
Type Article
PeerReviewed
 
Format application/pdf
 
Identifier http://cir.cmmacs.ernet.in/43/1/pageoph%2D2008.pdf
Parvez, Imtiyaz A (2008) Coda Q Estimates in the Andaman Islands Using Local Earthquakes. Pure and Applied Geophysics, 165 (9-10). pp. 1861-1878. ISSN 00334553
 
Relation http://www.springerlink.com
http://cir.cmmacs.ernet.in/43/