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Differential shear wave attenuation and its lateral variation in the North Atlantic regionA digital data base of over 150 seismograms and a spectral radio technique are used to measure SS-S differential attenuation in the North Atlantic region. Differential attenuation is positively correlated with SS-S travel time residual, and both differential attentuation and travel time residual decrease with increasing seafloor age. Models are developed for seismic Q in which lateral variations include contributions from the asthenospheric low-Q zone as well as from lithospheric cooling. The Q models obtained under this assumption are in good agreement with those obtained from surface wave studies and are therefore preferred over those models with lateral variations confined to the upper 125 km. Systematic long-wavelength (1000-7000 km) variations in differential attenuation, corrected for seafloor age, are evident along the axis of the Mid-Atlantic Ridge. These variations can be qualitatively correlated with long-wavelength variations in SS-S differential travel time residuals and are attributed to along-axis differences in upper mantle temperature.
Document ID
19930027946
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Sheehan, Anne F.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Solomon, Sean C.
(MIT Cambridge, MA, United States)
Date Acquired
August 15, 2013
Publication Date
October 10, 1992
Publication Information
Publication: Journal of Geophysical Research
Volume: 97
Issue: B11
ISSN: 0148-0227
Subject Category
Geophysics
Accession Number
93A11943
Funding Number(s)
CONTRACT_GRANT: NSF EAR-90-04750
CONTRACT_GRANT: NAGW-3036
CONTRACT_GRANT: NAG5-814
Distribution Limits
Public
Copyright
Other

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