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## An estimate of Coda Q (Qc) in Andaman Islands from

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**An estimate of Coda Q (Qc) in Andaman Islands from**Aftershocks recorded by Temporary Seismic Network By P.K. Chakraborty GSI, Kolkata**O.T,**Station : Diglipur (DGP), Origin time: 2002 10 01 0403 46.11, Mag:3.5**Single backscattering model of Aki and Chouet (1975)**A(f,t) = C(f) t –a exp (-ft/Qc) -------(1) ln[A(f,t).t] = c-bt ---------(2) Where b = ft/Qc and c= ln C(f)**1: Original trace, 2-7: Bandpass filtered waveforms of the**event recorded at DGP on 01-10-2002 at 04 03 46..11. Bandpass: 1-2, 2-4, 4-8, 6-12, 8-16 and 12-24 Hz.**Lapse time window : 30 Sec**Q=325, f=6 Q=69 f=1.5 Q=805, f=12 ln (A,t) Q=1204, f=18 Q=157, f=3 Q=676, f=9 ln (A,t) Coda Q values at different central frequencies for the Event: 2002 10 01 0403 46.11 recorded at DGP**Epicentral map along with the seismic**Network. Recording Stations are shown as triangles and epicentres are Depicted as solid circles. DGP MAB HVK POR**Lapse time window: 20 Sec 30**Sec 40 Sec Qc = 108 f 0.99 Qc= 62 f 1.1 Qc = 21 f 1.12 Qc Frequency dependence Qc relation for different Lapse time window in Andaman.