caa a22 4500 463172299 CHVBK 20180406164816.0 cr unu---uuuuu 170326e20070401xx s 000 0 eng 10.1007/s10950-006-9042-y doi (NATIONALLICENCE)springer-10.1007/s10950-006-9042-y Lapse time and frequency-dependent attenuation characteristics of coda waves in the Northwestern Himalayas [Elektronische Daten] [S. Mukhopadhyay, C. Tyagi] We analyzed the local earthquakes waveform recorded on a broadband seismic network in the northwestern Himalayan Region to compute lapse time and frequency dependence of coda Q (Q c). The observed Q c values increase with increasing lapse time at all frequency bands. The increase in Q c values with lapse time is attributed to an increase in Q c with depth. This implies that attenuation decreases with increasing depth. The approximate radius of medium contributing to coda generation varies from 55 to 130km. By comparing the Q c values with those from other regions of the world, we find that they are similar to those obtained from tectonically active regions. The estimated Q c values show a frequency-dependent relationship, Q c = Q 0 f n , where Q 0 is Q c at 1Hz and n represents degree of frequency dependence. They represent the level of heterogeneity and tectonic activity in an area. Our results show that northwest Himalayas are highly heterogeneous and tectonically very active. Q 0 increases from 113 ± 7 to 243 ± 10 and n decreases from 1.01 ± 0.05 to 0.85 ± 0.03 when lapse time increases from 30 to 70s. As larger time window sees the effect of deeper part of the Earth, it is concluded that Q 0 increases and n decreases with increasing depth; i.e., heterogeneity decreases with depth in the study area. Springer Science+Business Media, Inc., 2007 Q c nationallicence lapse time nationallicence frequency nationallicence attenuation characteristics nationallicence northwest Himalayas nationallicence Mukhopadhyay S. Department of Earth Sciences, IIT Roorkee, Roorkee, 247667, Uttaranchal, India aut Tyagi C. Department of Earth Sciences, IIT Roorkee, Roorkee, 247667, Uttaranchal, India aut Journal of Seismology Kluwer Academic Publishers 11/2(2007-04-01), 149-158 1383-4649 11:2<149 2007 11 10950 https://doi.org/10.1007/s10950-006-9042-y text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10950-006-9042-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Mukhopadhyay S. Department of Earth Sciences, IIT Roorkee, Roorkee, 247667, Uttaranchal, India aut NATIONALLICENCE 700 1- Tyagi C. Department of Earth Sciences, IIT Roorkee, Roorkee, 247667, Uttaranchal, India aut NATIONALLICENCE 773 0- Journal of Seismology Kluwer Academic Publishers 11/2(2007-04-01), 149-158 1383-4649 11:2<149 2007 11 10950 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer