Journal of Earth System Science

, Volume 117, Supplement 2, pp 833–852

Seismic microzonation of Bangalore, India

Article

DOI: 10.1007/s12040-008-0071-5

Cite this article as:
Anbazhagan, P. & Sitharam, T.G. J Earth Syst Sci (2008) 117: 833. doi:10.1007/s12040-008-0071-5

Abstract

In the present study, an attempt has been made to evaluate the seismic hazard considering local site effects by carrying out detailed geotechnical and geophysical site characterization in Bangalore, India to develop microzonation maps. An area of 220 km2, encompassing Bangalore Mahanagara Palike (BMP) has been chosen as the study area. Seismic hazard analysis and microzonation of Bangalore are addressed in three parts: in the first part, estimation of seismic hazard is done using seismotectonic and geological information. Second part deals with site characterization using geotechnical and shallow geophysical techniques. In the last part, local site effects are assessed by carrying out one-dimensional (1-D) ground response analysis (using the program SHAKE2000) using both standard penetration test (SPT) data and shear wave velocity data from multichannel analysis of surface wave (MASW) survey. Further, field experiments using microtremor studies have also been carried out for evaluation of predominant frequency of the soil columns. The same has been assessed using 1-D ground response analysis and compared with microtremor results. Further, the Seed and Idriss simplified approach has been adopted to evaluate the soil liquefaction susceptibility and liquefaction resistance assessment. Microzonation maps have been prepared with a scale of 1:20,000. The detailed methodology, along with experimental details, collated data, results and maps are presented in this paper.

Keywords

Seismic hazardsite characterizationSPTMASWground response analysisliquefactionsMicrozonation

Copyright information

© Indian Academy of Sciences 2008

Authors and Affiliations

  1. 1.Civil Engineering DepartmentIndian Institute of ScienceBangaloreIndia