# Spatial Correlation of Interseismic Coupling and Coseismic Rupture Extent of the 2011 M$$_W$$ = 9.0 Tohoku-oki Earthquake

 Title: Spatial Correlation of Interseismic Coupling and Coseismic Rupture Extent of the 2011 M$$_W$$ = 9.0 Tohoku-oki Earthquake Author: Meade, Brendan J.; Loveless, John P. Note: Order does not necessarily reflect citation order of authors. Citation: Loveless, John P., and Brendan J. Meade. 2011. Spatial correlation of interseismic coupling and coseismic rupture extent of the 2011 $$M_W = 9.0$$ Tohoku-oki earthquake. Geophysical Research Letters 28:L17306. Full Text & Related Files: TohokuCouplingGrl2011.pdf (3.050Mb; PDF) Abstract: Imaging the extent to which the rupture areas of great earthquakes coincide with regions of pre-seismic interplate coupling is central to understanding patterns of strain accumulation and release through the earthquake cycle. Both geodetic and seismic estimates of the coseismic rupture extent for the March 11, 2011 $$M_W = 8.9–9.0$$ earthquake Tohoku-oki earthquake may be spatially correlated (0.26 ± 0.05 to 0.82 ± 0.05) with a region estimated to be partially to fully coupled in the interseismic period preceding the earthquake, though there is substantial variation in the estimated distribution and magnitude of coseismic slip. The ∼400 km-long region estimated to have slipped ≥4 m corresponds to an area of the subduction zone interface that was coupled at ≥30% of long-term plate convergence rate, with peak slip near a region coupled ≥80%. The northern termination of rupture is collocated with a region of relatively low (<20%) interseismic coupling near the epicenter of the 1994 $$M_W = 7.6$$ Sanriku-oki earthquake, and near a region of potential long-term low coupling or ongoing slow slip. Slip on the subduction interface beneath the coastline (40–50 km depth) is best constrained by the land-based GPS data and least constrained on the shallowest portion of the plate interface due to the ∼230 km distance between geodetic observations and the Japan trench. Published Version: doi:10.1029/2011GL048561 Terms of Use: This article is made available under the terms and conditions applicable to Other Posted Material, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#LAA Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:12491521 Downloads of this work: