East–West strain rate distribution in central Japan before (upper row) and after (lower row) the 2011 Tohoku-oki earthquake based on continuous GPS observation (left on each row). Purple lines denote active fault traces. East–West strain is a representative signal associated with both subduction of the Pacific plate and tectonic deformation in central Japan. Plots at the middle and on the right are long- and short wavelength components of the strain rate distribution. While the long-wavelength pattern was reversed before and after the earthquake, a persistent localized contraction is identified around the northern Niigata–Kobe Tectonic Zone delineated by a dashed line, indicating contribution of inelastic deformation.
Acknowledgements
We used the F3 daily coordinate solution of GEONET published by the Geospatial Information Authority of Japan for the analysis.
(Takeshi SAGIYA and Angela MENESES-GUTIERREZ)
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