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Moment Magnitude MW and Local Magnitude ML Relationship for Earthquakes in Northeast India



Moment Magnitude MW and Local Magnitude ML Relationship for Earthquakes in Northeast India



Pure and Applied Geophysics 169(11): 1977-1988



An attempt has been made to examine an empirical relationship between moment magnitude (MW) and local magnitude (ML) for the earthquakes in the northeast Indian region. Some 364 earthquakes that were recorded during 195 29 are used in this study. Focal mechanism solutions of these earthquakes include 189 Harvard-CMT solutions (MW ? 4.) for the period 1976 29, 61 published solutions and 114 solutions obtained for the local earthquakes (2. ? ML ? 5.) recorded by a 27-station permanent broadband network during 21 29 in the region. The MW ML relationships in seven selected zones of the region are determined by linear regression analysis. A significant variation in the MW ML relationship and its zone specific dependence are reported here. It is found that MW is equivalent to ML with an average uncertainty of about .13 magnitude units. A single relationship is, however, not adequate to scale the entire northeast Indian region because of heterogeneous geologic and geotectonic environments where earthquakes occur due to collisions, subduction and complex intra-plate tectonics.

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Accession: 036383461

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DOI: 10.1007/s00024-012-0465-9


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