Title: Deterministic Seismic Hazard analysis and Estimation of PHA for Bangalore City
Abstract: Deterministic seismic hazard analysis (DSHA) has been carried out by considering the historic earthquake, assumed subsurface fault length and point source synthetic ground motion generation model. Active lineaments are identified using remote sensing data. MCE has been determined by considering the regional seismotectonic activity in about 350km radius around Bangalore city. The seismotectonic map has been prepared by considering the faults, lineaments, shear zones in the area and historic earthquake events of more than 150 events. Shortest distance from the Bangalore to the different sources is measured and then Peak Horizontal Acceleration (PHA) calculated for the different sources and moment magnitude using regional attenuation relation. By carrying out sensitivity analysis the matching sub surface rupture length for the each historic earthquake based on Wells and Coppersmith [21]. It is found that subsurface fault rupture length of about 4% of total length of the fault is matching with historic earthquake events in the area close to the each source. SMSIM- FORTRAN programs for simulating ground motions from the Earthquakes have been used by giving the regional seismotectonic parameters as input for the different sources, the PHA for the different locations are evaluated. From the above three approaches the higher PHA causing earthquake moment magnitude of 5.1 is maximum credible earthquake and corresponding source Mandya-ChannapatnaBangalore lineament is obtained as the vulnerable source for Bangalore region. Maximum credible earthquake found in terms of moment magnitude is 5.1 with PHA value of about 0.150g. Acceleration time history (ground motion) of corresponding magnitude has been generated using synthetic earthquake model by considering the revised regional seismotectonic parameter presented in Sitharam and Anbazhagan [18].The revised parameter gives the PHA of 0.146g corresponding to MCE of past event
Publication Year: 2006
Publication Date: 2006-01-01
Language: en
Type: article
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Cited By Count: 3
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