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An extensive region of off-ridge normal-faulting earthquakes in the southern Indian OceanA verified prediction of the theory of plate tectonics is that the focal mechanisms of earthquakes on the mid-ocean ridge system indicate either normal faulting on ridge segments or strike-slip faulting on transform faults. A broad region in the southern Indian Ocean which differs from typical ridge and intraplate regimes has been identified. In this region a number of large off-ridge earthquakes have occurred in the last 20 years. The mechanisms for these events, where known, all involve normal faulting. Nine of these earthquakes have been studied in detail using a formal inversion technique based on matching synthetic body waves to observed seismograms.
Document ID
19840046000
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Bergman, E. A.
(Massachusetts Inst. of Tech. Cambridge, MA, United States)
Nabelek, J. L.
(Massachusetts Inst. of Tech. Cambridge, MA, United States)
Solomon, S. C.
(MIT Cambridge, MA, United States)
Date Acquired
August 12, 2013
Publication Date
April 10, 1984
Publication Information
Publication: Journal of Geophysical Research
Volume: 89
ISSN: 0148-0227
Subject Category
Geophysics
Accession Number
84A28787
Funding Number(s)
CONTRACT_GRANT: F49620-82-K-0004
CONTRACT_GRANT: NAS5-27339
CONTRACT_GRANT: NSF EAR-78-12936
CONTRACT_GRANT: NAG5-44
Distribution Limits
Public
Copyright
Other

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