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Interplate Coupling in and Around the Rupture Area of the 2011 Tohoku Earthquake (M9.0) Before Its Occurrence Based on Terrestrial and Seafloor Geodetic Observations

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International Symposium on Geodesy for Earthquake and Natural Hazards (GENAH)

Part of the book series: International Association of Geodesy Symposia ((IAG SYMPOSIA,volume 145))

Abstract

In this study, we investigated the state of interplate coupling between the subducting Pacific plate and continental plate around the rupture area of the 2011 Tohoku Earthquake (M9.0) based on seafloor geodetic data as well as terrestrial GPS data obtained before the M9 earthquake in order to evaluate the potential for further seismic activity from the viewpoint of the slip deficit budget balance. Due to the difference between the site spatial densities on land and the seafloor observation networks, it was necessary to utilize a covariance matrix with non-zero off-diagonal components in the inversion to estimate the interplate coupling distribution on the plate interface and to account for the correlations among the observation errors for components and stations. We validated the implementation of the assumed covariance matrix by performing a computational test and we then applied the method to actual geodetic data obtained before the 2011 Tohoku Earthquake. The results demonstrate the persistence of the interplate coupling in the area of a very large coseismic slip near the Japan Trench.

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Acknowledgements

The authors would like to thank the Japan Nuclear Energy Safety Organization, the Geospatial Information Authority of Japan, and the National Astronomical Observatory of Japan for providing GPS data. The present study was supported through the Intramural Research Grant for Special Project Researches from International Research Institute of Disaster Science, Tohoku University. Three anonymous reviewers provided thoughtful comments, which improved the manuscript. The figures were created using GMT software (Wessel and Smith 1998).

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Correspondence to Takeshi Iinuma .

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Iinuma, T., Hino, R., Kido, M., Ohta, Y., Miura, S. (2015). Interplate Coupling in and Around the Rupture Area of the 2011 Tohoku Earthquake (M9.0) Before Its Occurrence Based on Terrestrial and Seafloor Geodetic Observations. In: Hashimoto, M. (eds) International Symposium on Geodesy for Earthquake and Natural Hazards (GENAH). International Association of Geodesy Symposia, vol 145. Springer, Cham. https://doi.org/10.1007/1345_2015_48

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