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dc.contributor.authorSivaram,K.en_US
dc.contributor.authorUtpal, Saikiaen_US
dc.contributor.authorKanna, Nagarajuen_US
dc.contributor.authorKumar, Dineshen_US
dc.date.accessioned2019-07-01T05:37:14Z
dc.date.available2019-07-01T05:37:14Z
dc.date.issued2017-07en_US
dc.identifier.citationPure and Applied Geophysics, 174(7),2523-2545.en_US
dc.identifier.issn0033-4553en_US
dc.identifier.issn1420-9136en_US
dc.identifier.urihttp://dr.iiserpune.ac.in:8080/xmlui/handle/123456789/3333-
dc.identifier.urihttps://doi.org/10.1007/s00024-017-1574-2en_US
dc.description.abstractWe present a systematic study of seismic attenuation and its related Q structure derived from the spectral analysis of P-, S-waves in the southern India. The study region is separated into parts of EDC (Eastern Dharwar Craton), Western Dharwar Craton (WDC) and Southern Granulite Terrain (SGT). The study is carried out in the frequency range 1–20 Hz, using a single-station spectral ratio technique. We make use of about 45 earthquakes, recorded in a network of about 32 broadband 3-component seismograph-stations, having magnitudes (M L) varying from 1.6 to 4.5, to estimate the average seismic body wave attenuation quality factors; Q P and Q S. Their estimated average values are observed to be fitting to the power law form of Q = Q 0 f n. The averaged power law relations for Southern Indian region (as a whole) are obtained as Q P = (95 ± 1.12)f (1.32±0.01); Q S = (128 ± 1.84)f (1.49±0.01). Based on the stations and recorded local earthquakes, for parts of EDC, WDC and SGT, the average power law estimates are obtained as: Q P = (97 ± 5)f (1.40±0.03), Q S = (116 ± 1.5)f (1.48±0.01) for EDC region; Q P = (130 ± 7)f (1.20±0.03), Q S = (103 ± 3)f (1.49±0.02) for WDC region; Q P = (68 ± 2)f (1.4±0.02), Q S = (152 ± 6)f (1.48±0.02) for SGT region. These estimates are weighed against coda Q (Q C) estimates, using the coda decay technique, which is based on a weak backscattering of S-waves. A major observation in the study of body wave analysis is the low body wave Q (Q 0 < 200), moderately high value of the frequency-exponent, ‘n’ (>0.5) and Q S/Q P ≫ 1, suggesting lateral stretches of dominant scattering mode of seismic wave propagation. This primarily could be attributed to possible thermal anomalies and spread of partially fluid-saturated rock-masses in the crust and upper mantle of the southern Indian region, which, however, needs further laboratory studies. Such physical conditions might partly be correlated to the active seismicity and intraplate tectonism, especially in SGT and EDC regions, as per the observed low-Q P and Q S values. Additionally, the enrichment of coda waves and significance of scattering mechanisms is evidenced in our observation of Q C > Q S estimates. Lapse time study shows Q C values increasing with lapse time. High Q C values at 40 s lapse times in WDC indicate that it may be a relatively stable region. In the absence of detailed body wave attenuation studies in this region, the frequency dependent Q relationships developed here are useful for the estimation of earthquake source parameters of the region. Also, these relations may be used for the simulation of earthquake strong ground motions which are required for the estimation of seismic hazard, geotechnical and retrofitting analysis of critical structures in the region.en_US
dc.language.isoenen_US
dc.publisherSpringer Natureen_US
dc.subjectAttenuation Characteristicsen_US
dc.subjectHigh Frequency Seismicen_US
dc.subjectWaves in Southern Indiaen_US
dc.subjectSeismic attenuationen_US
dc.subjectQuality factor Qen_US
dc.subjectbody waves coda wavesen_US
dc.subjectSouthern Indiaen_US
dc.subject2017en_US
dc.titleAttenuation Characteristics of High Frequency Seismic Waves in Southern Indiaen_US
dc.typeArticleen_US
dc.contributor.departmentDept. of Earth and Climate Scienceen_US
dc.identifier.sourcetitlePure and Applied Geophysicsen_US
dc.publication.originofpublisherForeignen_US
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