Long-period surface motion of the multi-patch Mw9.0 Tohoku-Oki earthquake

Psimoulis, Panos; Houlie, Nicolas; Michel, Clotaire; Meindl, Michael; Rothacher, Markus

Abstract

We show that it is possible to capture the oscillatory ground motion induced by the Tohoku-Oki event for periods ranging from 3 to 100s using Precise Point Positioning (PPP). We find that the ground motions of the sedimentary basins of Japan were large (respectively > 0.15m/s and >0.15m/s2 for velocity and acceleration) even for periods larger than 3s. We compare geodetic observables with a Ground Motion Prediction Equation (GMPE) designed for Japan seismicity and find that the Spectral Acceleration (SA) is well estimated for periods larger than 3s and distances ranging from 100 to 500km. At last, through the analysis of the displacement attenuation plots, we show that the 2011 Tohoku-Oki event is likely composed of multiple rupture patches as suggested before by time-reversal inversions of seismic data.

Citation

Psimoulis, P., Houlie, N., Michel, C., Meindl, M., & Rothacher, M. (2014). Long-period surface motion of the multi-patch Mw9.0 Tohoku-Oki earthquake. Geophysical Journal International, 199(2), https://doi.org/10.1093/gji/ggu302

• Journal Article Type: Article
• Acceptance Date: Jul 31, 2014
• Publication Date: Nov 1, 2014
• Deposit Date: Jul 22, 2016
• Publicly Available Date: Jul 22, 2016
• Journal: Geophysical Journal International
• Print ISSN: 0956-540X
• Electronic ISSN: 1365-246X
• Publisher: Oxford University Press
• Peer Reviewed: Peer Reviewed
• Volume: 199
• Issue: 2
• DOI: https://doi.org/10.1093/gji/ggu302
• Keywords: satellite geodesy, transient deformation, earthquake ground motions, surface waves and free oscillations, early warning
• Public URL: https://nottingham-repository.worktribe.com/output/737340
• Publisher URL: http://gji.oxfordjournals.org/content/199/2/968
• Additional Information: This is a pre-copyedited, author-produced PDF of an article accepted for publication in Geophysical Journal International following peer review. The version of record Long-period surface motion of the multipatch Mw9.0 Tohoku-Oki earthquake / Geophys. J. Int. (2014) 199 (2):968-980 is available online at: http://gji.oxfordjournals.org/content/199/2/968
• Contract Date: Jul 22, 2016