多斑块Mw9 .0地震的长周期地表运动
Long-period surface motion of the multi-patch Mw9.0 Tohoku-Oki earthquake
摘要：
我们表明，它是可能的，以捕捉振荡地面运动引起的东北冲事件的周期从3到100秒，使用精密单点定位（PPP）。我们发现日本沉积盆地的地震动即使在大于3s的周期内也很大（速度和加速度分别> 0.15m/s和>0.15m/s ~ 2）。我们比较大地观测与地面运动预测方程（GMPE）设计的日本地震活动性，发现频谱加速度（SA）是很好的估计周期大于3秒，距离从100到500公里。最后，通过对位移衰减图的分析，我们发现2011年东北冲地震可能是由多个破裂斑组成的，这与之前地震资料的时间反演结果一致。
英文摘要：
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.
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