Japan Geoscience Union Meeting 2022

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[E] Poster

M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS10] Interdisciplinary studies on pre-earthquake processes

Mon. May 30, 2022 11:00 AM - 1:00 PM Online Poster Zoom Room (31) (Ch.31)

convener:Katsumi Hattori(Department of Earth Sciences, Graduate School of Science, Chiba University), convener:Jann-Yenq LIU(Department of Space Science and Engineering, National Central University, Taiwan), Dimitar Ouzounov(Center of Excellence in Earth Systems Modeling & Observations (CEESMO) , Schmid College of Science & Technology Chapman University, Orange, California, USA), convener:Qinghua Huang(Peking University), Chairperson:Katsumi Hattori(Department of Earth Sciences, Graduate School of Science, Chiba University), Dimitar Ouzounov(Center of Excellence in Earth Systems Modeling & Observations (CEESMO) , Schmid College of Science & Technology Chapman University, Orange, California, USA), Jann-Yenq LIU(Department of Space Science and Engineering, National Central University, Taiwan), Peng Han(Southern University of Science and Technology, Shenzhen, China)

11:00 AM - 1:00 PM

[MIS10-P05] Multi-channel singular spectrum analysis of soil radon concentration, Japan

*Katsumi Hattori1,2,3, Kazuhide Nemoto4, Haruna Kojima4, akitugu kitade4, syu kaneko5, Chie Yoshino1, Toru Mogi1, Dimitar Ouzounov6 (1.Department of Earth Sciences, Graduate School of Science, Chiba University, 2.Center for Environmental Remote Sensing, Chiba University, 3.Disaster Medicine Research Institute, Chiba University, 4.Department of Earth Sciences, Faculty of Science, Chiba University, 5.Department of Earth Sciences, Graduate School of Science and Engineering, Chiba University, 6.Chapman University)

Keywords:Multi-channel singular spectrum analysis, soil radon concentration, soil radon flux, local seismic activity, precipitation

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 are developing soil and atmospheric Rn observations using an α-ray detector in Chiba-Ibaraki area to investigate the relationship between earthquakes and Rn emissions from the ground. We have installed sensors for atmospheric electric field, atmospheric ion concentration, atmospheric Rn concentration, soil radon Rn concentration (SRC), and weather elements, 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 SRC 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.