Show simple item record

dc.contributor.authorten Brink, Uri S.  Concept link
dc.contributor.authorLin, Jian  Concept link
dc.date.accessioned2010-07-13T13:12:38Z
dc.date.available2010-07-13T13:12:38Z
dc.date.issued2004-12-24
dc.identifier.citationJournal of Geophysical Research 109 (2004): B12310en_US
dc.identifier.urihttps://hdl.handle.net/1912/3741
dc.descriptionAuthor Posting. © American Geophysical Union, 2004. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research 109 (2004): B12310, doi:10.1029/2004JB003031.en_US
dc.description.abstractStrike-slip faults in the forearc region of a subduction zone often present significant seismic hazard because of their proximity to population centers. We explore the interaction between thrust events on the subduction interface and strike-slip faults within the forearc region using three-dimensional models of static Coulomb stress change. Model results reveal that subduction earthquakes with slip vectors subparallel to the trench axis enhance the Coulomb stress on strike-slip faults adjacent to the trench but reduce the stress on faults farther back in the forearc region. In contrast, subduction events with slip vectors perpendicular to the trench axis enhance the Coulomb stress on strike-slip faults farther back in the forearc, while reducing the stress adjacent to the trench. A significant contribution to Coulomb stress increase on strike-slip faults in the back region of the forearc comes from “unclamping” of the fault, i.e., reduction in normal stress due to thrust motion on the subduction interface. We argue that although Coulomb stress changes from individual subduction earthquakes are ephemeral, their cumulative effects on the pattern of lithosphere deformation in the forearc region are significant. We use the Coulomb stress models to explain the contrasting deformation pattern between two adjacent segments of the Caribbean subduction zone. Subduction earthquakes with slip vectors nearly perpendicular to the Caribbean trench axis is dominant in the Hispaniola segment, where the strike-slip faults are more than 60 km inland from the trench. In contrast, subduction slip motion is nearly parallel to the Caribbean trench axis along the Puerto Rico segment, where the strike-slip fault is less than 15 km from the trench. This observed jump from a strike-slip fault close to the trench axis in the Puerto Rico segment to the inland faults in Hispaniola is explained by different distributions of Coulomb stress in the forearc region of the two segments, as a result of the change from the nearly trench parallel slip on the Puerto Rico subduction interface to the more perpendicular subduction slip beneath Hispaniola. The observations and modeling suggest that subduction-induced strike-slip seismic hazard to Puerto Rico may be smaller than previously assumed but the hazard to Hispaniola remains high.en_US
dc.description.sponsorshipJ.L. was supported by the National Science Foundation through grant NSF-EAR0003888.en_US
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen_US
dc.publisherAmerican Geophysical Unionen_US
dc.relation.urihttps://doi.org/10.1029/2004JB003031
dc.subjectStress interactionen_US
dc.subjectSubductionen_US
dc.subjectStrike-slip faultsen_US
dc.subjectForearcen_US
dc.subjectPuerto Ricoen_US
dc.subjectHispaniolaen_US
dc.titleStress interaction between subduction earthquakes and forearc strike-slip faults : modeling and application to the northern Caribbean plate boundaryen_US
dc.typeArticleen_US
dc.identifier.doi10.1029/2004JB003031


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record