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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/21986
Title: Attenuation mechanism of seismic wave in Chamoli region of Garhwal-Kumaun Himalayas
Authors: Kumar A.
Mukhopadhyay, Sagarika
Del-Pezzo E.
Published in: 72nd European Association of Geoscientists and Engineers Conference and Exhibition 2010: A New Spring for Geoscience. Incorporating SPE EUROPEC 2010
Abstract: In this study the S-wave attenuation mechanism is analyzed and intrinsic and scattering attenuation effects are separated. This helps in understanding the physical mechanisms governing attenuation properties of the crust of this region. It has been observed that the Qs-1, Qd-1 and Qc-1 values at all frequencies are comparable. The estimated Le-1, B0, Qi-1, Qs-1, Qd-1 and Qc-1 values show that S-wave attenuation is primarily controlled by scattering attenuation in the source zone of the 1999 Chamoli earthquake. My results also show that for the source zone of 1999 Chamoli earthquake in the Garhwal Himalayas seismic albedo is very high, i.e. attenuation is mainly controlled by scattering attenuation. In conclusion, The extinction length Le varies between about 12 km to about 125 km in the study region. The seismic albedo (B0) values vary between 0.65 and 0.8. B0 values are very large (>0.5) showing that at all frequencies scattering attenuation is the dominating factor causing attenuation of seismic waves. This shows that the degree of heterogeneity is very high for the frequency range considered in this area. © 2010, European Association of Geoscientists and Engineers.
Citation: 72nd European Association of Geoscientists and Engineers Conference and Exhibition 2010: A New Spring for Geoscience. Incorporating SPE EUROPEC 2010 (2010), 7: 5350-5354
URI: https://doi.org/10.3997/2214-4609.201401346
http://repository.iitr.ac.in/handle/123456789/21986
Issue Date: 2010
Publisher: Society of Petroleum Engineers
Keywords: Seismic waves
Shear waves
Solar radiation
Attenuation properties
Dominating factors
Frequency ranges
Himalayas
Physical mechanism
S-waves
Scattering attenuation
Source zone
Earthquakes
ISBN: 9.78162E+12
Author Scopus IDs: 36065336900
35617607600
7003907590
Author Affiliations: Kumar, A., Indian Institute of Technology, Roorkee, India
Mukhopadhyay, S., Indian Institute of Technology, Roorkee, India
Del-Pezzo, E., Istituto Nazionale di Geofisica, Vulcanologia, Italy
Corresponding Author: Kumar, A.; Indian Institute of Technology, Roorkee, India
Appears in Collections:Conference Publications [ES]

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