Uncertainties and its Role in Seismic Hazard Analysis of District Headquarter Dantewara, Chhattisgarh, India
Keywords:
Fault, Seismic Source Models, Attenuation, Peak Ground Acceleration, Seismic Hazard.Abstract
In the present paper, an attempt has been made to estimate seismic hazard at bedrock level in terms of PGA using state of art probabilistic seismic hazard analysis. A detailed catalogue of historical and recent seismicity within 300 km radius around the city has been compiled and new seismotectonic map has been generated for the region. The completeness of the data should be checked before carrying out hazard analysis. Finally earthquake data was analyzed statistically and the seismicity of the region around District Headquarter Dantewara of Chhattisgarh, India, has been evaluated by defining ‗a‘ and ‗b‘ parameters of Gutenberg- Richter recurrence relationship. The Regional Recurrence Relationship and ―b‖ value, 0.6974 is obtained for District Headquarter Dantewara. The Maximum value of Peak Ground Acceleration (P.G.A.) for recurrence period of 100 years was found to be due to the Godavari Valley Fault which came out to be equal to 0.06211 for 50 Percentile and 09887 for 84 Percentile. The seismic hazard curve prepared, for district Headquarter can be furthered used to find out the PGA values for various return periods for different probabilities (2%, 10%, 50% ) of occurrence .
