Simpson, D.W. 1976. It has steep-sided, flat-topped hill ranges, interspersed with flat-bottomed valleys (Fig. Extractions of characterized parameters are on grid cell basis. Fractures and cooling joints are seen on the surface. Probabilistic seismic hazard assessment of India, Seismological Research Letters, 83 (1), 135–149. Probabilistic seismic hazard estimation of peninsular India. Sarma. Sign up for the Nature Briefing newsletter — what matters in science, free to your inbox daily. The 1967 Koynanagar earthquake occurred near Koynanagar town in Maharashtra, India on 11 December local time. More important concerns about the important engineering works can be M s ≥6.5 and R≤30 km events with small probability and strong earthquakes. Slightly damaging intensity (MMI-VII level) expected in 50 years has ~ 40% probability and PGA greater than 21% g for the area which is located between Koyna and Warna Reservoirs, which is identified as high hazard zone. It occurred near the site of Koyna dam, raising questions about induced seismicity, and claimed at least 177 lives and injured over 2,200. 3). The present study aims at mapping the spatial distribution of hazard intensity in terms of peak ground acceleration and damage potential expressed as Modified Mercalli Intensity (MMI) levels owing to the scenario earthquakes (M4.0 to M6.9) from the linear sources and background seismicity in the Koyna region. Geoenvironmental Disasters Sitharam, T.G., and P. Anbazhagan. Spatial mapping of the hazard parameters is performed on Geographic Information System (GIS) platform. Koyna-Warna region (Fig. Chandra, U. 2010. The WGE divides the eastern Deccan Plateau; where the lowest elevation (around Karad and Kolhapur) is about 550 m a.s.l. Considerable regional fracture lineaments in the study area are N-S (strong geomorphic and geophysical expression), NW-SE (strong geomorphic and geophysical expression), NE-SW (moderate Geomorphic and geophysical expression) and E-W (not clear). Seismic events, concealed faults and lineaments. Kaila, K.L., P.R. Besides, low-level laterite deposits, coastal alluvial soils are found along the Konkan Coast it consists of deep sandy loam soil deposits. Bulletin of the Seismological Society of America 70: 1337–1356. Uplands, Maharashtra, India. (2) (McGuire, 2004). (2) by assuming that the rate of earthquake occurrence in time is governed by the Poisson law. Seismicity changes associated reservoir loading. Some geologists believe that the earthquake was due to reservoir-triggered seismic activity,[4] but senior project officials have repeatedly denied this conclusion. Data used in this study are — earthquake catalog information of ~400 years period to determine earthquake rates, high resolution geology maps, local soil maps supported by field-based data in establishing subsurface information of the site conditions, Landsat-7 ETM+ satellite images (NASA Landsat Program, 2003) for maintaining the uniform spatial continuity and demarcation of lineaments/faults and SRTM data for deciphering landforms, elevation, natural slope classes. Assessment of the probability of occurrence of various hazard levels, within the next 50 years, from the potential sources is computed from the probabilistic seismic hazard assessment (PSHA) hazard-integral Eq. Along with the historical and instrumental earthquake data, we incorporate updated and relocated seismic events from circa 1618 to 2017 covering ~ 400 years period, for analyzing the mean annual rates of seismicity and earthquake recurrence intervals. Internet Explorer). Figure 3.3 gives out the average value and standard difference of the ratios of each group, EPA and PGA. 7). Fracture planes are occurring sub-parallel to each other. It can be seen from Fig. Regional geomorphic features such as valleys and steep slope hilly landforms — forming high relief terrain can alter the direction of propagating seismic waves. Chadha, R.K. 1992. The earthquake of April 25, 1997, was located close to Koyna and February 11, 1998 earthquake was close to the Warna Reservoir. (1), lnY = PGA, M = magnitude, R = hypocentral distance, εe = epistemic uncertainty, and εa = aleatory uncertainty, C1 to C5 are regression coefficients. Bull., 35, 175 (1945). Nath, S. K., and Thingbaijam, K. K. S. 2012. In: Mukherjee, S., Misra, A.A., Calve’s, G. and Nemcok, M. (eds), Tectonics of the Deccan Large Igneous Province. Earthquake ground shaking varies from place to place and it depends on the properties of the rocks and weathered or soil column that earthquake waves travel through. Rao, N.P., Kumar, M.R., Seshunarayana, T., Shukla, A.K., Suresh, G., Pandey, Y., Raju, D., Pimprikar, S.D., Das, C., Gahalaut, K., Mishra, P.S., and Gupta, H. 2011. Damaging intensity (MMI-VII level) expected in 50 years has ~ 40% probability for the area is located between Koyna and Warna Reservoirs.