<p align="left">The attenuation properties of Delhi & surrounding region have been investigated using 6<em>2</em> local earthquakes recorded at nine stations. The frequency dependent quality factors <em>Q</em><em><sub>a</sub></em> (using P-waves) and <em>Q</em><em><sub>b</sub></em> (using S-waves) have been determined using the coda normalization method. Quality factor of coda-waves (<em>Q<sub>c</sub></em>) has been estimated using the single backscattering model in the frequency range from 1.5 Hz to 9 Hz. Wennerberg formulation has been used to estimate <em>Q<sub>i</sub></em> (intrinsic attenuation parameter) and <em>Q<sub>s</sub></em> (scattering attenuation parameter) for the region. The values <em>Q</em><em><sub>a</sub>, Q</em><em><sub>b, </sub>Q<sub>c, </sub>Q<sub>i</sub> and Q<sub>s</sub></em> estimated are frequency dependent in the range of 1.5Hz-9Hz. Frequency dependent relations are estimated as <em>Q</em><em><sub>a</sub>=52f<sup>1.03</sup>, Q</em><em><sub>b</sub>=98f<sup>1.07</sup> and Q<sub>c</sub>=158f<sup>0.97</sup></em>. <em>Q<sub>c</sub></em> estimates lie in between the values of <em>Q<sub>i</sub></em> and <em>Q<sub>s</sub></em> but closer to <em>Q<sub>i</sub></em> at all central frequencies. Comparison between <em>Q<sub>i</sub> </em>and <em>Q<sub>s</sub></em> shows that intrinsic absorption is predominant over scattering for Delhi and surrounding region. </p>
CodaNorm: A software package for the body-wave attenuation calculation by the coda-normalization method