Fig. 5

Comparison of hourly (blue) and daily (blue, with dots) rain rates (both in mm/h), and average daily subsidence of GNSS stations (red) during August 2021 in Southwest Japan. AMeDAS rain gauge stations and GNSS stations are shown with blue and red dots in the map. Four data sets represent different averaging spatial scales, from top to bottom, a local scale, the Fukuoka Prefecture, the Kyushu Island (made of 7 prefectures), and the whole SW Japan. The correlation between rain and subsidence improves as we average over larger areas (0.61, 0.68, 0.73, 0.82 from top to bottom). Average sea level pressure data with 1σ error bars (bottom) are obtained from 30 barometers in SW Japan