Frequency and lapse time dependent seismic attenuation in eastern Himalaya and southern Tibet

Sagar Singh, Chandrani Singh (), Rahul Biswas and Arun Singh
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Sagar Singh: Indian Institute of Technology Kharagpur
Chandrani Singh: Indian Institute of Technology Kharagpur
Rahul Biswas: Indian Institute of Technology Kharagpur
Arun Singh: Indian Institute of Technology Kharagpur

Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, 2017, vol. 85, issue 3, No 19, 1709-1722

Abstract: Abstract We have studied the attenuation characteristics of eastern Himalaya and southern Tibet by using local earthquake data set that consists of 123 well-located events, recorded by the Himalayan Nepal Tibet Seismic Experiment operated during 2001–2003. We have used single backscattering model to calculate frequency-dependent values of coda Q ( $$Q_\mathrm{c}$$ Q c ). The estimation of $$Q_\mathrm{c}$$ Q c is made at central frequencies 2, 4, 8 and 12 Hz through five lapse time windows from 10 to 50 s starting at double the travel time of the S-wave. The observed $$Q_\mathrm{c}$$ Q c is found to be strongly frequency-dependent and follows a similar trend as observed in other tectonically active parts of the Himalaya. The trend of variation of $$Q_\mathrm{c}$$ Q c with lapse time and the corresponding apparent depths is also studied. Increase in $$Q_\mathrm{c}$$ Q c values with the lapse time suggests that the deeper part of the study region is less heterogeneous than the shallower part. The observed values of $$Q_0$$ Q 0 ( $$Q_\mathrm{c}$$ Q c at 1 Hz) and frequency parameter n indicate that the medium beneath the study area is highly heterogeneous and tectonically very active. A regionalization of the estimated $$Q_0$$ Q 0 is carried out, and a contour map is prepared for the whole region. Some segments of Lesser Himalaya and Sub-Himalaya exhibit very low $$Q_0$$ Q 0 , while the whole Tethyan Himalaya and some parts of Greater Himalaya are characterized by low $$Q_0$$ Q 0 values. Our results are comparable with those obtained from tectonically active regions in the world.

Keywords: Seismic attenuation; Coda Q; Lapse time (search for similar items in EconPapers)
Date: 2017
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DOI: 10.1007/s11069-016-2660-y

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