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Historical Seismograms - Evidence from the AD 2000 Izu Islands ...

Historical Seismograms - Evidence from the AD 2000 Izu Islands ...

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..338 H. N. Sn'vastava and S. K. Das9cp 92' 9 6" 9TCPERlOD 1980-83 I00?88 IMD 'irATIOd.15ABFCC STATIONSA EXTRA DEPPRTMENTAL5?AT ION0 < 4.0- \J.> f ~~\J 6 I- 2900 920 94VbpFigure 2. Earthquake Epicentres in Nor<strong>the</strong>ast India (1980-1983).to ambiguities in mesoseismal or instrumental data. However, for <strong>the</strong> purpose ofma<strong>the</strong>matical computations, mean value of magnitude has been assigned on <strong>the</strong>magnetic tape file of <strong>the</strong> IMD catalogue of earthquakes, which is being updatedperiodically with data <strong>from</strong> ISC, USGS, and IMD bulletins. This facility has madeour consultancy services remarkably quicker.Gubin (1968) compiled a catalogue of earthquakes for peninsular India after <strong>the</strong>Koyna earthquake of December 1967. It contained data on earthquakes in <strong>the</strong>region up to 1968. Later, Chandra (1977) prepared a catalogue of earthquakes for<strong>the</strong> region (5 - 28' N, 67.5 - 90' E) <strong>from</strong> <strong>the</strong> year 1594 to 1975 based on data <strong>from</strong> 33

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