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Bulletin of the Seismological Society of America; April 1970; v. 60; no. 2; p. 601-615
© 1970 Seismological Society of America
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The Godavari Valley earthquake sequence of April 1969

HARSH K. GUPTA, INDRA MOHAN and HARI NARAIN

SEISMOLOGY DIVISION NATIONAL GEOPHYSICAL RESEARCH INSTITUTE, HYDERABAD—7, India

Abstract

The Godavari Valley earthquake sequence of April 1969 has been studied in detail. The (Sg – Pg) and the (Pg – Pn) intervals have been used for estimating the extent of aftershock area and focal depth variations respectively. The main shock of magnitude 5.7 was followed by a number of aftershocks which are related by the function Log N = a + b M. The value of b is found to be –0.51. The main shock of April 13 accounted for 70 per cent of the total strain released. This sequence belongs to Type I of Mogi's classification. The macroseismic effects are also discussed briefly.




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