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A Geodetic Strain Rate Model for the East African Rift System

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dc.contributor.authorStamps, D. Sarahen
dc.contributor.authorSaria, E.en
dc.contributor.authorKreemer, C.en
dc.contributor.departmentGeosciencesen
dc.date.accessioned2018-07-24T17:01:39Zen
dc.date.available2018-07-24T17:01:39Zen
dc.date.issued2018-01-15en
dc.description.abstractHere we describe the new Sub-Saharan Africa Geodetic Strain Rate Model v.1.0 (SSA-GSRM v.1.0), which provides fundamental constraints on long-term tectonic deformation in the region and an improved seismic hazards assessment in Sub-Saharan Africa. Sub-Saharan Africa encompasses the East African Rift System, the active divergent plate boundary between the Nubian and Somalian plates, where strain is largely accommodated along the boundaries of three subplates. We develop an improved geodetic strain rate field for sub-Saharan Africa that incorporates 1) an expanded geodetic velocity field, 2) redefined regions of deforming zones guided by seismicity distribution, and 3) updated constraints on block rotations. SSA-GSRM v.1.0 spans longitudes 22° to 55.5° and latitudes −52° to 20° with 0.25° (longitude) by 0.2° (latitude) spacing. For plates/sub-plates, we assign rigid block rotations as constraints on the strain rate calculation that is determined by fitting bicubic Bessel splines to a new geodetic velocity solution for an interpolated velocity gradient tensor field. We derive strain rates, velocities, and vorticity rates from the velocity gradient tensor field. A comparison with the Global Geodetic Strain Rate model v2.1 reveals regions of previously unresolved spatial heterogeneities in geodetic strain rate distribution, which indicates zones of elevated seismic risk.en
dc.description.sponsorshipNational Science Foundationen
dc.description.sponsorshipNational Aeronautics and Space Administrationen
dc.description.sponsorshipNSF: EAR-0735156en
dc.description.sponsorshipUSAIDen
dc.description.sponsorshipNSF:EAR-1249295en
dc.format.mimetypeapplication/pdfen
dc.identifier.doihttps://doi.org/10.1038/s41598-017-19097-wen
dc.identifier.urihttp://hdl.handle.net/10919/84331en
dc.identifier.volume8en
dc.language.isoen_USen
dc.publisherNatureen
dc.rightsCreative Commons Attribution 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.titleA Geodetic Strain Rate Model for the East African Rift Systemen
dc.title.serialScientific Reportsen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten

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