At the Koikorobe coast in Iwate Prefecture, we identified two especially large boulders. A boulder, 13.3 × 9.82 × 5.65 m³ and estimated to be 1454 t, is likely not to have been moved by the 2011 tsunami according to the comparison of pre‐tsunami and post‐tsunami aerial photographs between 1977 and 2013. On the other hand, the other boulder, 10.0 × 6.61 × 5.3 m³ and estimated to be 690 t, was moved during the same period. This is the largest natural boulder that has been moved by a recent tsunami in the world.

中文翻译：

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2011年东北冲海啸运送的巨石

在岩手县的Koikorobe海岸，我们发现了两个特别大的巨石。根据1977年至2013年海啸发生前和海啸发生后的航拍照片比较，2011年海啸可能不会移动一块13.3×9.82×5.65 m ³的巨石，估计为1454 t。在同一时期，另一块大石头10.0×6.61×5.3 m ³，估计为690 t，移动了。这是世界上最近的海啸已经移动的最大的天然巨石。