pure and applied geophysics

, Volume 145, Issue 1, pp 109–122 | Cite as

Investigations of June 7, 1988 earthquake of magnitude 4.5 near Idukki Dam in Southern India

  • B. K. Rastogi
  • R. K. Chadha
  • C. S. P. Sarma


A mildly damaging earthquake of magnitude 4.5 and intensity VI occurred 20 km east of the Idukki reservoir, Kerala in southern India. With a network of 5 seismic stations, the aftershocks which continued for 3 1/2 months were monitored. The hypocentral parameters, b value,M1/M0 ratio indicate that this earthquake sequence does not qualify to be categorized as induced. The trend of the aftershocks, composite fault plane solution and local tectonics point towards reactivation of a NW-SE fault along the Kallar river. The existence of such a fault is also supported by gravity studies.

Key words

South India earthquake sequence 


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Copyright information

© Birkhäuser Verlag 1995

Authors and Affiliations

  • B. K. Rastogi
    • 1
  • R. K. Chadha
    • 1
  • C. S. P. Sarma
    • 1
  1. 1.National Geophysical Research InstituteHyderabadIndia

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