Abstract
The 2001 Mw 7.6 earthquake sourced in the Kachchh rift of northwest India led to extensive damage in the city of Bhuj, located ~70 km southwest of its epicenter. The building stock of this densely populated city was a mix of modern, single, and multistoried structures as well as traditional and non-engineered abodes, most of which were not designed to withstand severe shaking effects. Although there was extensive liquefaction and ground failure in the meizoseismal area, they were not observed in Bhuj, but the damage was severe here. In this study, we apply horizontal to vertical spectral ratio method to ambient vibrations (HVSR-AV) to obtain fundamental resonance frequency (f0) and H/V peak amplitude (A0) to examine if site response had any significant role in the observed damage. The patterns of H/V curves as well as spatial distributions of f0 (0.6–1.4 Hz) and A0 (1.5–4.4) suggest absence of any strong impedance contrast within the subsurface. Similar results obtained for ambient vibrations and earthquake signals suggest the efficacy of the HVSR-AV method as most useful for regions of low-level seismicity. The weathered sandstone that is generally exposed in the city represents the resonating layer whose thickness is approximately estimated as ~66–155 m, based on 1D assumption. The current set of available data precludes any quantitative modeling, but our preliminary inference is that site effects were not significant during the 2001 earthquake damage observed in Bhuj.
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Acknowledgment
The authors acknowledge the financial support from the Earth System Science Organization, Ministry of Earth Sciences (MoES), Government of India, to establish the seismology laboratory. This work was also partly supported by a project funded by the seismicity program of MoES. The authors are thankful for Naveen for his help with field surveys. CARTOSAT DEM (ISRO) and the open-source tools (GEOPSY, GNUPLOT, and INKSCAPE) are gratefully acknowledged. Reviews and suggestions by S. Martel and an anonymous reviewer on a previous version of this manuscript have helped to improve the manuscript.
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Natarajan, T., Rajendran, K. Site responses based on ambient vibrations and earthquake data: a case study from the meizoseismal area of the 2001 Bhuj earthquake. J Seismol 21, 335–347 (2017). https://doi.org/10.1007/s10950-016-9604-6
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DOI: https://doi.org/10.1007/s10950-016-9604-6