Fig. 10

Time series of a the standardized daily average for the residuals of soil CO₂ flux; b daily average for wind speed (blue line), wind direction (orange dot), and barometric pressure (black line); and c 30 min maximum seismic amplitude (black dot) and plume SO₂ flux (red circle) for the period including anomalies A1–A3. The colors in a are the same as those in Fig. 9a. The vertical dashed line in a–c corresponds to the timing of the 8 October 2016 eruption. The seismic amplitude is recorded at Sunasenri station of Kyoto University, which is 1.3 km S of the active crater, and is filtered at the frequency of 2 Hz. The plume SO₂ flux is from monthly reports by the Japan Meteorological Agency (available at http://www.data.jma.go.jp/svd/vois/data/tokyo/STOCK/monthly_v-act_doc/monthly_vact_vol.php?id=503). d–f The same time series as a–c for the period including anomalies A4 and A5