MATLAB codes (CodaQ) for estimation of attenuation characteristics of coda waves

Seismic waves recorded by seismographs have been used to study the characteristics of earthquake source, path through which they travel and near surface site characteristics. MATLAB codes (CodaQ) have been developed to estimate the quality factor (Qc) of the medium through which they travelled from coda waves. The scattered part of shear waves by the heterogeneities of the medium is known as coda waves. These waves infer the heterogeneous nature of the medium. The codes are developed based on single backscattering model proposed by Aki and Chouet (1975) and guidelines given in SEISAN software to estimate coda Q. The input time histories in sesame ascii format (SAF) have been utilised by CodaQ program to estimate frequency dependent quality factor of the medium. The codes have been verified on an earthquake occurred near Uttarkashi region of Garhwal Himalaya and recorded by a 12 station seismological telemetered network deployed around Tehri region of Garhwal Himalaya.