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Seismic risk reduction: some aspects and case studies
Published in Kosta Talaganov, Gunther Schmid, Computational Structural Dynamics, 2020
This phase involves several specific research activities like investigation of the seismicity of the region, study of the geological conditions with a particular emphasis on seismotectonics, seismic hazard analysis, investigation of local geological conditions, seismic zoning, definition of seismic design parameters, seismological monitoring and alike.
Seismic Hazard Analysis of Vadodara Region, Gujarat, India: Probabilistic & Deterministic Approach
Published in Journal of Earthquake Engineering, 2022
Seismotectonic model provides the deep insights of tectonic features, earthquake associated with each faults, seismic activities around the individual faults. This model will be further useful for the detailed microzonation study of any region. The model is also need to upgrade regularly after any major earthquake event in a particular region. Hardly any attempt has been made to develop this type of model for the study region. Major faults and lineaments have been identified from the Seismotectonic Atlas (GSI 2000) published by Geological Survey of India and from other published literatures for the study region. The base map has been prepared by compiling 17 major faults, 10 lineaments, and 17 minor tectonic features on the common platform of Geographic Information System (GIS). The length of seismic sources varied from 15 km to 550 km. Vadodara region is carrying the seismic risk not only due to near field sources like Marginal fault, Son Narmada fault, Cambay West fault, and Tapti North fault but also from far field sources like Kutch Mainland fault, Island Belt fault, and Allah Bund Fault. Around 13 earthquakes have been reported which is having moment magnitude Mw ≥ 6 in the study area. In the present investigation, study region is bounded by latitude from 19°N to 26°N and longitude from 69°E to 77°E covering 350 km radius around the Vadodara city as a center. The two important tectonic features near the Vadodara city are the Narmada and Cambay rifts (Fig. 3). The third tectonic feature is the Tapi rift zone located at the south of Narmada rift, which has low-level seismicity (Fig. 3). The ENE trending Narmada rift zone is associated with seismicity of magnitude 6 or more (Mohanty and Verma 2013) while the NW trending Cambay rift is of magnitude 6 or less and of magnitude about 5 or less along ENE trending Tapi rift (Fig. 3). Due to the seismicity of magnitude 7 or above has been associated with the Kutch Mainland fault and Allah Bund fault (Chopra and Choudhury 2011), the region is also vulnerable to these far field sources. The epicenters of declustered data of past 350 years earthquakes for the time interval of 1668–2017 have been superimposed to generate the seismotectonic model (Fig. 3) for the study region.