In the ETAS model, each seismic event was assumed to produce aftershocks that follow Omori’s law. The entire seismicity is described by the superposition of the aftershocks, as well as seismic events that do not follow Omori’s law. Especially in geothermal areas where rich fluid flows exist, the latter seismic events seem to be derived from fluid activities27. The number of those seismic events a day was described by the μ value in the ETAS analysis. We estimated the μ value using a 10‐day time window that moves at intervals of one day. The estimated μ value was adopted as the value for the last day of the time window coverage. We only used the seismic events that occurred within the blue rectangle shown in Fig. 1b to focus on fluid activities near YAE6. In the ETAS analysis, it is needed to define the start of the precursory period of seismic activity that precedes the time window. May 1, 2015 was set as the start of the precursory period when the routine hypocenter determination begun in OGF. Notably, the sensor of YAE6 that had been installed till January 2016 lacked heat tolerance and was not qualified to conduct the H/V spectral ratio analysis. In this study, we used seismic wave data of YAE6 only after replacing the current sensor with enough heat tolerance.

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