[MIS09-P07] Ground Rn flux anomaly and crustal activity around Asahi station, Boso Peninsula, Japan
Keywords:Lithosphere-Atmosphere-Ionosphere Coupling, atmospheric electric field, atmospheric ion concentration, ground Rn concentration, atmospheric Rn concentration
For earthquakes within an epicenter distance of 50 km from the station, it is found that the correlation between Rn flux and regional cumulative seismic moment and/or Es index, which indicates the daily local seismic energy received at the station. These earthquakes had the characteristics they occurred directly underneath the station in the boundary of the Pacific Plate and the North American Plate and they are reverse fault type components.
We investigated the relationship between stress change and GRF to consider the model of fluctuation of the GRF. In this study, we calculated the dilatation using the F3 solution published by the Geospatial Information Authority of Japan. As a result, the GRF increased with compression and decreased with expansion. The result suggests that GRF has the sensitivity to stress changes and can be an indicator of large earthquakes that have pre-slip and slow slip events.