Fig. 1

Location and monitoring direction of the GB-InSAR. a Locations of new craters, new fumaroles, and steam wells that blew out in Owakudani area, b the GB-InSAR equipment installed in Owakudani, and c photograph showing the area scanned by the GB-InSAR radar. The names of craters and fumaroles are based on Mannen et al. (2018)