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タイトル: Inclined bending seismic reflection layer in the crust illuminated by distributed fibre-optic-sensing measurements in western Japan著者: Miyazawa, Masatoshi抄録: Distributed acoustic sensing (DAS), which enables a single fibre-optic cable to function as multiple sensors, is a technique to measure the strain rate distributed along the cable. This technique is applied to record ground motions in western Japan via a 50 km-long fibre-optic cable beneath a national road. The measured values are strain changes along the cable every 5 m, corresponding to 9788 sensor deployments. This high-density measurement along the long cable successfully recorded the 2021 M2.8 and M3.2 earthquakes that occurred in the crust within the distance of the cable in southern Kyoto. The direct S waves were followed by seismic waves approximately 8-14 s later, which were reflected by lower crustal structures. These waveforms were previously reported by observing many earthquakes via multiple seis ...

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