EGU22-12349
https://doi.org/10.5194/egusphere-egu22-12349
EGU General Assembly 2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Multi-channel singular spectrum analysis of soil radon concentration, Japan: Relationship between soil radon flux and precipitation and the local seismic activity

Katsumi Hattori1, Kazuhide Nemoto1, Haruna Kojina1, Akitsugu Kitade1, Shu kaneko1, Chie Yoshino1, Toru Mogi1, Toshiharu Konishi2, and Dimitar Ouzounov3
Katsumi Hattori et al.
  • 1Chiba University, Japan
  • 2Oken Kogyo Inc., Japan
  • 3Chapman University, US

Recently, there are many papers on electromagnetic pre-earthquake phenomena such as geomagnetic, ionospheric, and atmospheric anomalous changes. Ionospheric anomaly preceding large earthquakes is one of the most promising phenomena. Lithosphere-Atmosphere-Ionosphere Coupling (LAIC) model has been proposed to explain these phenomena. In this study, to evaluate the possibility of chemical channel of LAIC by observation, we have installed sensors for atmospheric electric field, atmospheric ion concentration, atmospheric Rn concentration, soil radon Rn concentration (SRC), and weather elements at Asahi station, Boso, Japan. Since the atmospheric electricity parameters are very much influenced by weather factors, it is necessary to remove these effects as much as possible. In this aim, we apply the MSSA (Multi-channel Singular Spectral Analysis) to remove these influences from the variation of GRC and estimate the soil Rn flux (SRF). We investigated the correlations (1) between SRF and precipitation and (2) between SRF and the local seismic activity around Asahi station. The preliminary results show that SRF was significantly increased by heavy precipitations of 20 mm or more in total for 2 hours. We proposed two types of models, a rainwater load model and a rainwater infiltration model, and it is appropriate for both models to work and (2) between SRF and local seismicity within an epicenter distance of 50 km from the station.

 

How to cite: Hattori, K., Nemoto, K., Kojina, H., Kitade, A., kaneko, S., Yoshino, C., Mogi, T., Konishi, T., and Ouzounov, D.: Multi-channel singular spectrum analysis of soil radon concentration, Japan: Relationship between soil radon flux and precipitation and the local seismic activity, EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-12349, https://doi.org/10.5194/egusphere-egu22-12349, 2022.