High-Precision Elucidation of the 2016 Kumamoto Earthquake's Fault Activity History—Trench Survey Unveils a 15,000-Year Record—

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A Japanese research team conducted a high-precision trench survey on a fault from the 2016 Kumamoto earthquake, revealing up to eight seismic events over the last 15,000 years. By analyzing the main Futagawa fault and the secondary Idenokuchi fault, they narrowed down the timing of the most recent activities to a 200-300 year window. This study highlights the importance of analyzing smaller, secondary faults to improve the accuracy of future earthquake prediction.