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
Add to personal list- 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