Kappa model and Coda-Q for Eastern Chotanagpur Plateau region (India)

Rashid Shams and Mohit Agrawal ()
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Rashid Shams: Indian Institute of Technology (Indian School of Mines)
Mohit Agrawal: Indian Institute of Technology (Indian School of Mines)

Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, 2023, vol. 117, issue 1, No 23, 519-553

Abstract: Abstract The Chotanagpur Plateau (CNP) forms an important part of the Indian Shield, has experienced moderate seismicity in the past. There are records of significant historical earthquakes that occurred in 1868 Hazaribagh (maximum observed intensity VI), 1811 Kolkata (M 5.0), 1963 Singhbhum (M 5.2) and 1969 Bankura (M 5.7). Hence, in order to carry out seismic hazard studies, it is important to study the seismicity of this region. Kappa (κ) and Coda-Q are important attenuation parameters that can aid in the stochastic simulation of ground motion and development of region-specific Ground Motion Prediction Equations (GMPEs). In this study, κ model is developed using the classical method by Anderson and Hough (Bull Seism Soc Am 74:1969–1993, 1984) and Coda-Q is estimated using Single backscattering model by Aki and Chouet (J Geophys Res 80:3322–3342, 1975). Seismic data used include 139 accelerograms obtained from six broadband stations, i.e., IIT(ISM), Sahibganj (SBG), Khunti (KNTI), Nirsa (NRS), Bokaro (BOK) and Peterwar (PTWR). The average value of κ is found to be 0.0364 which is found to be dependent on epicentral distance. The Qc values are calculated for three Coda windows, i.e., 40, 50 and 60 s and are found to be strongly dependent on frequency as they increase with it. Extinction distance results show that the upper mantle is relatively homogeneous and the attenuation below 86–119 km depth is less. The Qc and ‘n’ values on comparison with the regional as well as the global studies are found to lie in intermediate range indicating moderate seismicity and presence of heat zones in the Eastern Chotanagpur Plateau (ECNP) region.

Keywords: Kappa model; Single backscattering method; CODA-Q; Eastern Chotanagpur Plateau (search for similar items in EconPapers)
Date: 2023
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DOI: 10.1007/s11069-023-05871-9

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