Earthquakes are known to have occurred in Indian subcontinent from ancient times. This paper presents the results of seismic hazard analysis of India (6°–38°N and 68°–98°E) based on the deterministic approach using latest seismicity data (up to 2010). The hazard analysis was done using two different source models (linear sources and point sources) and 12 well recognized attenuation relations considering varied tectonic provinces in the region. The earthquake data obtained from different sources were homogenized and declustered and a total of 27,146 earthquakes of moment magnitude 4 and above were listed in the study area. The sesismotectonic map of the study area was prepared by considering the faults, lineaments and the shear zones which are associated with earthquakes of magnitude 4 and above. A new program was developed in MATLAB for smoothing of the point sources. For assessing the seismic hazard, the study area was divided into small grids of size 0.1° × 0.1° (approximately 10 × 10 km), and the hazard parameters were calculated at the center of each of these grid cells by considering all the seismic sources within a radius of 300 to 400 km. Rock level peak horizontal acceleration (PHA) and spectral accelerations for periods 0.1 and 1 s have been calculated for all the grid points with a deterministic approach using a code written in MATLAB. Epistemic uncertainty in hazard definition has been tackled within a logic-tree framework considering two types of sources and three attenuation models for each grid point. The hazard evaluation without logic tree approach also has been done for comparison of the results. The contour maps showing the spatial variation of hazard values are presented in the paper.
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Acknowledgements
Authors would like to acknowledge IMD, BARC, USGS, ISC, IRIS and NGRI for providing the details of earthquake events in the Indian subcontinent. Authors are thankful to Centre for Infrastructure and Sustainable Transportation, Indian Institute of Science, Bangalore for providing necessary GIS tools and support for the present work. The authors thank the anonymous reviewers for their valuable comments towards improving the quality of the manuscript.
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KOLATHAYAR, S., SITHARAM, T.G. & VIPIN, K.S. Deterministic seismic hazard macrozonation of India. J Earth Syst Sci 121, 1351–1364 (2012). https://doi.org/10.1007/s12040-012-0227-1
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DOI: https://doi.org/10.1007/s12040-012-0227-1