SUMMARY Subduction zones are associated with significant seismic hazards around the world and determining the future locations of large earthquakes within these systems is a perpetual challenge of the Earth sciences. This study presents back-projection results from the 2021 Mw 7.1 Fukushima earthquake which show that the rupture area of this event filled a previously identified coseismic gap within the rupture area of the 2011 Mw 9.1 Tohoku-oki earthquake. These results, combined with observations of a similar coseismic gap from the 2010 Mw 8.8 Maule, Chile earthquake that was subsequently filled by a Mw 7.1 aftershock, demonstrate that future assessments of seismic hazards following giant earthquakes should include the identification of coseismic gaps left within main shock rupture areas.

中文翻译：

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同震间隙的危害：2021 年福岛地震

总结 俯冲带与世界各地的重大地震灾害有关，确定这些系统内大地震的未来位置是地球科学的永恒挑战。本研究展示了 2021 Mw 7.1 福岛地震的反投影结果，表明该事件的破裂区域填补了 2011 Mw 9.1 Tohoku-oki 地震破裂区域内先前确定的同震间隙。这些结果，再加上对 2010 年 Mw 8.8 Maule 智利地震的类似同震间隙的观测结果，该地震随后被 Mw 7.1 余震填补，表明未来对大地震后地震危害的评估应包括识别主干地震中留下的同震间隙。冲击破裂区。