Fig. 4From: Phreatic eruptions and deformation of Ioto Island (Iwo-jima), Japan, triggered by deep magma injectionThe daily number of earthquakes and vertical movement at Motoyama before and after phreatic eruptions accompanied by precursors. a The eruption on November, 28–29, 1982; b the eruption on September 21, 2001; c the eruption on April 29, 2012; d the eruption on August 6, 2015. The green and blue curves denote vertical movement at GNSS observation stations. The red triangles denote the occurrence times of the eruptions, but the occurrence time of the eruption on November, 28–29, 1982 is not clearBack to article page