12:00 PM - 12:15 PM
[SCG56-06] Groundwater Monitoring in Noto Earthquake, at Kamioka Gifu Prefecture
Keywords:Noto Earthquake, Groundwater Monitoring, Kamioka, Gifu Prefecture, Geyser
In this presentation, we will compare the water flow rate observations data of Wariishi hotspring with the USGS Moment Rate Function. The epicenter distance of Wariishi is 107 km, which is close enough compared to the fault size of 120-150 km, so we thought that we could directly compare it with the epicenter time function. We compared it with the Moment Rate Function (MRF) published by the USGS. For the hot water flow data, we obtained 30- and 60-second High Pass Filter (HP) records for 5 minutes from the origin time of 16:10:22. The USGS MRF record takes 50 seconds from the first rupture to 10 seconds, from the second rupture to 25 seconds, and from the third sharp rising rupture to 35 seconds (this is called the killer pulse). We compared the hot water flow data with the MRF record by adjusting the time axis to the arrival time of the P-wave at Wariishi observation point. According to this, the dynamic fluctuations of the MRF and the flow rate seem to correspond quite well. In particular, it was found that the third sharp rising rupture corresponds to a large fluctuation in flow rate. The nearest strain observation point is the Nagoya University Asahi Observatory, which is 2.5 times the epicenter distance. Five minutes records of water flow rate and areal strain (areal strain is downward extension) were compared by origin time. The large increase in water flow rate between 40 and 50 seconds from the origin time is thought to correspond to the killer pulse.