Site Amplification Factors and Acceleration Response Spectra for Shallow Bedrock Sites – Application to Southern India

ABSTRACT

Site amplification coefficients and acceleration design response spectra (ADRS) for the shallow sites in SI are derived based on non-linear site response analysis at 125 locations. Input motions are selected by considering the seismic hazard map for 475 years as return period and inputted at depth where V_S ≥ 1,500 m/s. The new site factors, i.e. $F_{PGA}$, $F_a$, and $F_v$, are proposed for Southern India (SI) by classifying the sites seismically considering National Earthquake Hazards Reduction Program (NEHRP). Using the calculated site factor, a new ADRS is developed for SI, which depends on peak ground acceleration and seismic site class. The compatibility of ADRS is further evaluated with NEHRP and BIS:1893.

KEYWORDS:

• Shallow sites
• seismic amplification
• Southern India
• acceleration design response spectrum
• site response study

Acknowledgments

Authors would thank “Board of Research in Nuclear Sciences (BRNS)”, Department of Atomic Energy (DAE), Government of India for funding the project titled “Probabilistic seismic hazard analysis of Vizag and Tarapur considering regional uncertainties” (Ref No. Sanction No 36(2)/14/16/2016-BRNS).

Additional information

Funding

This work was supported by the Board of Research in Nuclear Sciences [Ref No. Sanction No 36(2)/14/16/2016-BRNS].