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dc.contributor.authorLindsey, Eric Ostromen
dc.contributor.authorBradley, Kyleen
dc.contributor.authorHubbard, Judithen
dc.contributor.authorMallick, Rishaven
dc.contributor.authorHill, Emma Maryen
dc.contributor.authorAlmeida, Rafaelen
dc.identifier.citationAlmeida, R., Lindsey, E. O., Bradley, K., Hubbard, J., Mallick, R., & Hill, E. M. (2018). Can the Updip Limit of Frictional Locking on Megathrusts Be Detected Geodetically? Quantifying the Effect of Stress Shadows on Near-Trench Coupling. Geophysical Research Letters, 45(10), 4754-4763. doi:10.1029/2018GL077785en
dc.description.abstractThe updip limit of the seismogenic zone of megathrusts is poorly understood. The relative absence of observed microseismicity in such regions, together with laboratory studies of friction, suggests that the shallow fault is mostly velocity strengthening, and likely to creep. Inversions of geodetic data commonly show low to zero coupling at the trench, reinforcing this view. We show that the locked, downdip portion of the megathrust creates an updip stress shadow that prevents the shallow portion of the fault from creeping at a significant rate, regardless of its frictional behavior. Our models demonstrate that even if the shallowest 40% of the fault is frictionally unlocked, the expected creep at the fault tip is at most 30% of the plate rate, often within the uncertainties of surface geodetic measurements, and below current resolution of seafloor measurements. We conclude that many geodetic models significantly underestimate the degree of shallow coupling on megathrusts, and thus seismic and tsunami hazard.en
dc.description.sponsorshipNRF (Natl Research Foundation, S’pore)en
dc.description.sponsorshipMOE (Min. of Education, S’pore)en
dc.format.extent10 p.en
dc.relation.ispartofseriesGeophysical Research Lettersen
dc.rights© 2018 The Authors. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.en
dc.subjectZero Couplingen
dc.titleCan the updip limit of frictional locking on megathrusts be detected geodetically? Quantifying the effect of stress shadows on near-trench couplingen
dc.typeJournal Articleen
dc.contributor.schoolAsian School of the Environmenten
dc.contributor.researchEarth Observatory of Singaporeen
dc.description.versionPublished versionen
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