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

Psimoulis, Panos A. ; Houlié, Nicolas ; Michel, Clotaire ; Meindl, Michael ; Rothacher, Markus

In: Geophysical Journal International, 2014, vol. 199, no. 2, p. 968-980

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    Title
    • Long-period surface motion of the multipatch Mw9.0 Tohoku-Oki earthquake
    Author
    • Psimoulis, Panos A.. Department of Civil Engineering, Nottingham Geospatial Institute, The University of Nottingham, Nottingham, NG7 2TU, United Kingdom. E-mail: panagiotis.psimoulis@nottingham.ac.uk
    • Houlié, Nicolas. Geodesy and Geodynamics Lab., Institute of Geodesy and Photogrammetry, ETH Zurich, Zurich 8093, Switzerland
    • Michel, Clotaire. Swiss Seismological Service, ETH Zurich, Zurich 8092, Switzerland
    • Meindl, Michael. Geodesy and Geodynamics Lab., Institute of Geodesy and Photogrammetry, ETH Zurich, Zurich 8093, Switzerland
    • Rothacher, Markus. Geodesy and Geodynamics Lab., Institute of Geodesy and Photogrammetry, ETH Zurich, Zurich 8093, Switzerland
    Document Type
    • Postprint
    Language
    • English
    Published in
    • Geophysical Journal International, 2014, vol. 199, no. 2, p. 968-980. Oxford University Press
    Other Version
    OAI-PMH Identifier
    • oai:doc.rero.ch:289607
    Summary
    We show that it is possible to capture the oscillatory ground motion induced by the Tohoku-Oki event for periods ranging from 3 to 100 s using precise point positioning. We find that the ground motions of the sedimentary basins of Japan were large (respectively >0.15 ms-1 and >0.15 ms-2 for velocity and acceleration) even for periods larger than 3s. We compare geodetic observables with a ground motion prediction equation designed for Japan seismicity and find that the spectral acceleration is well estimated for periods larger than 3 s and distances ranging from 100 to 500 km. 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