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Earth, Planets and Space
Fig. 1 | Earth, Planets and Space

Fig. 1

From: Frictional stability of porous tuff breccia under subsurface pressure conditions and implications for shallow seismicity

Fig. 1

Map of the Japanese island arc showing the distribution of the “Green Tuff” formation (dotted area), after Huzioka (1963). The stars represent the epicenters of the 2004 M6.6 mid-Niigata Prefecture earthquake (2004NP), the 2007 M6.6 Niigataken Chuetsu-oki earthquake (2007NCO), and the 2007 M6.7 Noto Hanto earthquake (2007NH). The upper left inset shows the volcaniclastic rocks distribution of the “Green Tuff” formation in the Noto Peninsula (Kaseno 1965). The Andesitic rock indicated by the gray areas represents the Anamizu Formation, where the tuff breccia samples for the present experiments were collected. The open circle shows the location drilled for sampling. The position of the inset is given by the rectangle box in the main figure

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