Abstract
Being seismically most active, Northeast India claims the need of high quality of seismic investigation to mitigate the risk of lives and properties of the region for which a well documented earthquake catalog is of prime importance. But the seismic surveillance of the area was in infantile stage till the 7th decade of last century. Prior to which scientific information about earthquakes of the area was not available. In the present study an attempt has been made to prepare a comprehensive earthquake catalog pertaining the rectangular area from 21 0 N to 29.5 0 N and 88 0 E to 97.5 0 E for last 110 years based on the available catalog of United States Geological Survey and International seismological Center. The catalog is analyzed for completeness magnitude (Mc) using Gutenberg's Frequency Magnitude Distribution (FMD) law and it is found to be 4 Mb. The completeness time of reported magnitude is assessed by Stepp Method, (1972). The completeness analysis shows that the catalog is complete for whole period for larger magnitude ≥ 7 Mb. Earthquakes having magnitude range 6-6.9 Mb, 5-5.9 Mb and 4- 4.9 Mb may be considered to be completely recorded since 1921, 1961 and 1991 respectively.
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