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dc.contributor.authorWolfson-Schwehr, Monica  Concept link
dc.contributor.authorBoettcher, Margaret S.  Concept link
dc.contributor.authorMcGuire, Jeffrey J.  Concept link
dc.contributor.authorCollins, John A.  Concept link
dc.date.accessioned2014-12-12T18:17:31Z
dc.date.available2015-03-29T09:06:15Z
dc.date.issued2014-09-29
dc.identifier.citationGeochemistry, Geophysics, Geosystems 15 (2014): 3698–3712en_US
dc.identifier.urihttps://hdl.handle.net/1912/6984
dc.descriptionAuthor Posting. © American Geophysical Union, 2014. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geochemistry, Geophysics, Geosystems 15 (2014): 3698–3712, doi:10.1002/2014GC005445.en_US
dc.description.abstractThere is a global seismic moment deficit on mid-ocean ridge transform faults, and the largest earthquakes on these faults do not rupture the full fault area. We explore the influence of physical fault structure, including step-overs in the fault trace, on the seismic behavior of the Discovery transform fault, 4S on the East Pacific Rise. One year of microseismicity recorded during a 2008 ocean bottom seismograph deployment (24,377 0 inline image ML inline image 4.6 earthquakes) and 24 years of Mw inline image 5.4 earthquakes obtained from the Global Centroid Moment Tensor catalog, are correlated with surface fault structure delineated from high-resolution multibeam bathymetry. Each of the 15 5.4 inline image Mw inline image 6.0 earthquakes that occurred on Discovery between 1 January 1990 and 1 April 2014 was relocated into one of five distinct rupture patches using a teleseismic surface wave cross-correlation technique. Microseismicity was relocated using the HypoDD relocation algorithm. The western fault segment of Discovery (DW) is composed of three zones of varying structure and seismic behavior: a zone with no large events and abundant microseismicity, a fully coupled zone with large earthquakes, and a complex zone with multiple fault strands and abundant seismicity. In general, microseismicity is reduced within the patches defined by the large, repeating earthquakes. While the extent of the large rupture patches on DW correlates with physical features in the bathymetry, step-overs in the primary fault trace are not observed at patch boundaries, suggesting along-strike heterogeneity in fault zone properties controls the size and location of the large events.en_US
dc.description.sponsorshipThe W. M. Keck Foundation provided financial support to build the 10 broadband seismometers that carried strong-motion accelerometers. This material is based on work supported by NSF grant OCE-024211 with additional support under grant OCE-1352565. Funding was also provided by the NOAA grant NA10NOS4000073.en_US
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen_US
dc.publisherJohn Wiley & Sonsen_US
dc.relation.urihttps://doi.org/10.1002/2014GC005445
dc.subjectTransform faulten_US
dc.subjectFault structureen_US
dc.subjectEarthquakesen_US
dc.subjectEast Pacific Riseen_US
dc.titleThe relationship between seismicity and fault structure on the Discovery transform fault, East Pacific Riseen_US
dc.typeArticleen_US
dc.description.embargo2015-03-29en_US
dc.identifier.doi10.1002/2014GC005445


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