10:45 AM - 12:15 PM
[SEM15-P15] Geomagnetic field observation using SQUID magnetometers during the earthquake swarm in the Noto Peninsula
Keywords:geomagneteic field, SQUID, Noto
Since around 2020, earthquake swarms have continued with epicenters in the northeastern part of the Noto Peninsula. On June 19, 2022, an M5.4 earthquake occurred, causing damage mainly in Suzu City. As a feature of this earthquake swarm, the existence of a low resistivity area is suggested underground. (Nakajima 2022, Yoshimura et al. 2022) As of February 2023, the number of earthquakes is gradually decreasing, but it has not completely subsided.
Focusing on the relationship between earthquake and magnetic signals, we conducted magnetic field observation using SQUID magnetometers at two sites in Noto Peninsula from April to October 2022. We installed the SQUID magnetometer at Karakasa-machi, Suzu City, which is surrounded by four cluster areas of seismic activity. The other SQUID magnetometer was installed in Monzen-machi, Wajima City, in order to compare the signals detected at both sites.
In the temporal waveforms obtained at both sites just before the seismic vibration reached in the June 19th earthquake, around 10-Hz signal was detected, which was not considered to be because of vibration or lightning. However, its relation to the earthquake has not yet been confirmed. Analyzing the variation in low-frequency data, it was implied that the ground of the Suzu’s site was gradually tilted after the earthquake.
In this presentation, we would like to show some observation results obtained for a half year, and discuss the relevance between the magnetic signals and seismic activities.
Acknowledgment
This work was supported by JSPS KAKENHI Grant Number 20K05053.
Focusing on the relationship between earthquake and magnetic signals, we conducted magnetic field observation using SQUID magnetometers at two sites in Noto Peninsula from April to October 2022. We installed the SQUID magnetometer at Karakasa-machi, Suzu City, which is surrounded by four cluster areas of seismic activity. The other SQUID magnetometer was installed in Monzen-machi, Wajima City, in order to compare the signals detected at both sites.
In the temporal waveforms obtained at both sites just before the seismic vibration reached in the June 19th earthquake, around 10-Hz signal was detected, which was not considered to be because of vibration or lightning. However, its relation to the earthquake has not yet been confirmed. Analyzing the variation in low-frequency data, it was implied that the ground of the Suzu’s site was gradually tilted after the earthquake.
In this presentation, we would like to show some observation results obtained for a half year, and discuss the relevance between the magnetic signals and seismic activities.
Acknowledgment
This work was supported by JSPS KAKENHI Grant Number 20K05053.