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Title: Temporal and spatial variations in the magnitude of completeness for homogenized moment magnitude catalog for Northeast India
Authors: Wason, H.R.
Das, Ranjit
Sharma, M.L.
Keywords: Northeast India region
Orthogonal Standard Regression
Magnitude of Completeness
seismogenic zones
Issue Date: 2012
Publisher: Journal of Earth System Sciences
Citation: H.R.Wason,Ranjit Das and M.L.Sharma, Temporal and spatial variations in the magnitude of completeness for homogenized moment magnitude catalog for Northeast India, Journal of Earth System Sciences, 121, No. 1(2012), pp. 19-28.
Abstract: Northeast India region is one of the most seismically active areas in the world. Events data for the period 1897-2010 used in this study has been largely compiled from global ISC, NEIC and GCMT databases. Historical seismicity catalog of Gupta et al (1986) and some events data from bulletins of India Meteorological Department are also used. Orthogonal regression relations for conversion of body and surface wave magnitudes to Mw,HRVD based on events data for the period 1978-2006 have been derived. An OSR relationship has also been obtained for scaling of intensity estimates to Mw,NEIC using 126 global intensity events with intensity vi or greater during the period 1975-2010. Magnitude of completeness and GR recurrence parameters values have been determined for the declustered homogenized catalog pertaining to four different time periods namely, 1897-1963,1964-1990, 1964-2000 and 1964-2010. The Mc and 'b' values are observed to decrease and increase, respectively, with addition of newer data with time. The study region has been subdivided into nine seismogenic zones keeping in view the spatial variations in earthquake occurrence and prevalent tectonics. Mc, 'b' and 'a' values have been estimated in respect of each zone, and the variations in the values of these parameters have been analysed. Keywords: Northeast India region, Orthogonal Standard Regression, Magnitude of Completeness, seismogenic zones.
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