Topographic gradient based site characterization in India complemented by strong ground-motion spectral attributes

Abstract
We appraise topographic-gradient approach for site classification that employs correlations between 30. m column averaged shear-wave velocity and topographic gradients. Assessments based on site classifications reported from cities across India indicate that the approach is reasonably viable at regional level. Additionally, we experiment three techniques for site classification based on strong ground-motion recordings, namely Horizontal-to-Vertical Spectral Ratio (HVSR), Response Spectra Shape (RSS), and Horizontal-to-Vertical Response Spectral Ratio (HVRSR) at the strong motion stations located across the Himalayas and northeast India. Statistical tests on the results indicate that these three techniques broadly differentiate soil and rock sites while RSS and HVRSR yield better signatures. The results also support the implemented site classification in the light of strong ground-motion spectral attributes observed in different parts of the globe. © 2013 Elsevier Ltd.

Citation
Nath, S. K., Thingbaijam, K. K. S., Adhikari, M. D., Nayak, A., Devaraj, N., Ghosh, S. K., & Mahajan, A. K. (2013). Topographic gradient based site characterization in India complemented by strong ground-motion spectral attributes. Soil Dynamics and Earthquake Engineering, 55, 233–246. doi:10.1016/j.soildyn.2013.09.005

Publisher
Elsevier BV

Journal
Soil Dynamics and Earthquake Engineering

DOI
10.1016/j.soildyn.2013.09.005

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