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Oceanic transform earthquakes with unusual mechanisms or locations - Relation to fault geometry and state of stress in the adjacent lithosphereResults are presented of a search for transform earthquakes departing from the pattern whereby they occur on the principal transform displacement zone (PTDZ) and have strike-slip mechanisms consistent with transform-parallel motion. The search was conducted on the basis of source mechanisms and locations taken from the Harvard centroid moment tensor catalog and the bulletin of the International Seismological Center. The source mechanisms and centroid depths of 10 such earthquakes on the St. Paul's, Marathon, Owen, Heezen, Tharp, Menard, and Rivera transforms are determined from inversions of long-period body waveforms. Much of the anomalous earthquake activity on oceanic transforms is associated with complexities in the geometry of the PTDZ or the presence of large structural features that may influence slip on the fault.
Document ID
19940033399
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Wolfe, Cecily J.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Bergman, Eric A.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Solomon, Sean C.
(MIT Cambridge, MA, United States)
Date Acquired
August 16, 2013
Publication Date
September 10, 1993
Publication Information
Publication: Journal of Geophysical Research
Volume: 98
Issue: B9
ISSN: 0148-0227
Subject Category
Geophysics
Accession Number
94A10054
Funding Number(s)
CONTRACT_GRANT: NSF EAR-90-04750
CONTRACT_GRANT: NAG5-2206
CONTRACT_GRANT: NAG5-1921
Distribution Limits
Public
Copyright
Other

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