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Fig. 3 | Earth, Planets and Space

Fig. 3

From: Electrical conductive fluid-rich zones and their influence on the earthquake initiation, growth, and arrest processes: observations from the 2016 Kumamoto earthquake sequence, Kyushu Island, Japan

Fig. 3

Dipping and vertical slices of the electrical resistivity structure and seismicity along and across the faults. The dip angle of each slice is shown at the top of each figure. The hypocenters within 2 km of each slice are plotted on the resistivity profiles. a Near-vertical (dip angle = 89°) slice along Hinagu Fault, which slipped during the Mw 6.2 foreshock. Blue star and contours indicate the foreshock hypocenter and spatial slip distribution on the fault plane (0.3-m contour interval). b Northward and westward-dipping slices along the mainshock fault planes (Figs. 1, 2). The mainshock rupture propagated along the Futagawa and Hinagu faults; these two fault planes merged at the location of the vertical dashed line. Red star and contours indicate the mainshock hypocenter and spatial slip distribution on the fault plane (1.0-m interval). Dashed white lines show the inferred 200 °C and 400 °C isotherms, which correspond to the base of the altered clay (smectite) layer and brittle–ductile transition zone, respectively. c Vertical slice along the Futagawa Fault. d Vertical slice across the foreshock and mainshock hypocenters (A–A′ profile in Fig. 2). e Vertical slice across the midpoint of Futagawa Fault (B–B′ profile in Fig. 2), where the largest slip due the mainshock is estimated

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