NDLI: New constraints on the width of the zone of active faulting on the East Pacific Rise 8° 30′ N – 10° 00′ N from Sea Beam Bathymetry and SeaMARC II Side-scan Sonar

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New constraints on the width of the zone of active faulting on the East Pacific Rise 8° 30′ N – 10° 00′ N from Sea Beam Bathymetry and SeaMARC II Side-scan Sonar

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Marine Geophysical Researches : Volume 21, Issue 5, September 2000

Marine Geophysical Researches : Volume 21, Issue 3-4, May 2000

Marine Geophysical Researches : Volume 21, Issue 1-2, February 2000

Marine Geophysical Researches : Volume 20

Marine Geophysical Researches : Volume 19

New constraints on the width of the zone of active faulting on the East Pacific Rise 8° 30′ N – 10° 00′ N from Sea Beam Bathymetry and SeaMARC II Side-scan Sonar

Content Provider	Springer Nature Link
Author	Crowder, Lisa K. Macdonald, Ken C.
Copyright Year	2000
Abstract	Sea Beam bathymetry and SeaMARC II side-scan sonar data are used to constrain the width of the zone of active faulting (plate boundary zone) to be ∼90 km (∼0.8 Ma) wide along the East Pacific Rise 8° 30′ N – 10° 00′ N. Fault scarps, identified on the basis of contoured, shaded relief and slope intensity maps of bathymetry, are measured. These scarp measurements, used in conjunction with data from a separate near-axis study, show that both inward- and outward-facing fault scarps increase in height away from the ridge axis, reaching average heights of ∼100 m at 0.8±0.2 Ma, 45±10 km from the ridge axis. Beyond this distance, there is no significant increase in scarp height. Earlier studies had suggested that the width of the zone of active faulting for outward-dipping faults might be significantly narrower than for inward-dipping faults. A lower crustal decoupling zone between brittle crust and strong upper mantle is predicted to exist out to ∼20–200 km from the ridge based on previously published lithospheric models. Such a decoupling zone may explain why outward-dipping faults continue to be active as far off-axis as inward-dipping faults. If the width of the zone of active faulting is controlled by the width of a lower crustal decoupling zone, our observations predict an ∼90 km wide decoupling zone in the lower oceanic crust at this location.
Starting Page	513
Ending Page	527
Page Count	15
File Format	PDF
ISSN	00253235
Journal	Marine Geophysical Researches
Volume Number	21
Issue Number	6
e-ISSN	15730581
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2000-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Geosciences Geophysics/Geodesy Oceanography Offshore Engineering
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology Geophysics Oceanography

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