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Strong ground motion analysis of Assam using H/V ratio method

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Abstract

Strong ground motion data required for analysis were obtained from 26 locations of Assam through their respective strong ground motion monitoring station websites. Raw data obtained were then processed to obtain average Horizontal to Vertical ratio (H/V ratio) of the strong ground motion spectrum. The average H/V ratio was then plotted against their corresponding frequency in a wave like pattern. The resonant frequency of a particular location was indicated by the frequency corresponding to the first peak of the average H/V ratio spectrum. The resonant frequency was then plotted against sediment thickness measured from nearby borehole data in order to obtain an empirical relation. Also, a comparison was made in this regard with the obtained empirical equation with already established work. Moreover, in this paper, a new attempt was made to correlate resonant frequency with water table depth measured from borehole data. Likewise amplitude from the seismic waves was also plotted against sediment thickness and aquifer thickness data available from local boreholes. All these correlations showed a good fit with a little assessment about the seismic condition of the Assam being made.

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Acknowledgements

The author wishes to thank Vice chancellor and Dean Dr. S. Suresh Kumar, Faculty of Ocean Science and Technology, Kerala University of Fisheries and Ocean Studies, Panangad, Kochi for their support. The co author of this paper wishes to thank Dr. P. S. Sunil Kumar, Head of Department, Department of Marine Geology and Geophysics for his support.

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Correspondence to Janarthana Boobalan Anthiraikili.

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Janarthana Boobalan Anthiraikili is the first author.

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Anthiraikili, J.B., HariDas, H. Strong ground motion analysis of Assam using H/V ratio method. Arab J Geosci 15, 1680 (2022). https://doi.org/10.1007/s12517-022-10975-w

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