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Geophysical insights into the Transition Fault debate; propagating strike slip in response to stalling Yakutat Block subduction in the Gulf of Alaska

Sean P. S. Gulick, Lindsay A. Lowe, Terry L. Pavlis, James V. Gardner and Larry A. Mayer
Geophysical insights into the Transition Fault debate; propagating strike slip in response to stalling Yakutat Block subduction in the Gulf of Alaska
Geology (Boulder) (August 2007) 35 (8): 763-766

Abstract

On the basis of faulting mapped on seismic reflection and bathymetric data, seismicity, current plate motions, and evidence that the Yakutat block may be anomalously thick, we propose a tectonic model for Yakutat-Pacific interactions, including the often-debated Transition fault. To the east, deformation associated with the Queen Charlotte-Fairweather fault system is extending offshore, facilitating westward propagation of strike-slip motion along the eastern segment of the Transition fault. To the west, the oblique-slip Pamplona zone and Transition faults merge at an embayment in the continental margin, where a north-south dextral strike-slip fault within the Pacific plate, illuminated by the 1987-1992 earthquake swarm, intersects the Pacific-Yakutat tectonic boundary. These fault patterns are consistent with modern plate motions and reflect a plate boundary reorganization that may be caused by resistance to subduction by the Yakutat block, a possible moderate-sized oceanic plateau.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 35
Serial Issue: 8
Title: Geophysical insights into the Transition Fault debate; propagating strike slip in response to stalling Yakutat Block subduction in the Gulf of Alaska
Affiliation: University of Texas at Austin, Institute for Geophysics, Austin, TX, United States
Pages: 763-766
Published: 200708
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 26
Accession Number: 2007-084843
Categories: Structural geologyApplied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sects., sketch map
N57°00'00" - N62°00'00", W148°00'00" - W136°00'00"
Secondary Affiliation: University of Texas at El Paso, USA, United StatesUniversity of New Hampshire, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 200739
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