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<p>The high-frequency attenuation parameter Kappa (<i>κ</i>) governs the decay of high frequencies significantly. It may differ depending on the source, path, site, or a combination of these parameters. In the present study, we determined ‘<i>κ</i>' values for three regions: Kachchh, Saurashtra, Mainland Gujarat, and these regions are all located in the western part of the Deccan Volcanic Province (DVP), India, and is an intraplate region. ‘<i>κ</i>' values were derived from 423 earthquakes with magnitudes ranging from M<sub>L</sub>3.0&#xa0;to&#xa0;5.3, recorded by the Institute of Seismological Research, Gujarat, India. The acceleration time histories have been converted into a spectrum using a conventional Fast Fourier transform technique. The spectral decay parameter is determined by performing linear-least square fits acceleration spectrum on a log-linear plot. The ‘<i>κ</i>’ values vary between 0.009 and 0.055 for the western part of DVP with average ‘<i>κ</i>’ values of 0.0241 ± 0.0096, 0.0207 ± 0.0071, 0.0212 ± 0.0078 for Kachchh, Saurashtra, and Mainland Gujarat regions, respectively. Dependency of ‘Kappa (<i>κ</i>)’ has been observed on distance, site, and source for all three regions. The estimated high-frequency attenuation parameter ‘Kappa (<i>κ</i>)’ is essential in seismic hazard assessments and can be employed during the simulation of strong ground motions.</p>

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Study of high-frequency attenuation parameter Kappa for Saurashtra, Kachchh, and Mainland Gujarat regions of the western part of Deccan Volcanic Province

  • 期刊论文

  • 发表日期：

    2025年4月7日

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  • Chaitanya Kumar Repudi,
  • Santosh Kumar

摘要

The high-frequency attenuation parameter Kappa (κ) governs the decay of high frequencies significantly. It may differ depending on the source, path, site, or a combination of these parameters. In the present study, we determined ‘κ' values for three regions: Kachchh, Saurashtra, Mainland Gujarat, and these regions are all located in the western part of the Deccan Volcanic Province (DVP), India, and is an intraplate region. ‘κ' values were derived from 423 earthquakes with magnitudes ranging from ML3.0 to 5.3, recorded by the Institute of Seismological Research, Gujarat, India. The acceleration time histories have been converted into a spectrum using a conventional Fast Fourier transform technique. The spectral decay parameter is determined by performing linear-least square fits acceleration spectrum on a log-linear plot. The ‘κ’ values vary between 0.009 and 0.055 for the western part of DVP with average ‘κ’ values of 0.0241 ± 0.0096, 0.0207 ± 0.0071, 0.0212 ± 0.0078 for Kachchh, Saurashtra, and Mainland Gujarat regions, respectively. Dependency of ‘Kappa (κ)’ has been observed on distance, site, and source for all three regions. The estimated high-frequency attenuation parameter ‘Kappa (κ)’ is essential in seismic hazard assessments and can be employed during the simulation of strong ground motions.