Fig. 4From: Surface fault ruptures associated with the 14 April foreshock (Mj 6.5) of the 2016 Kumamoto earthquake sequence, southwest JapanSnapshots of surface ruptures related to the largest foreshock and mainshock at each site shown in Fig. 1c and/or Fig. 2. a Mole-track structures and open cracks, which first appeared associated with the largest foreshock and later enlarged due to the mainshock. b Two fault traces on an unpaved road, indicated by white arrows, between which a small depression appeared. Vertical offset of ca. 10 cm up on the north was identified across the two fault traces. c, d Five rupture traces with right-lateral offset of a paved road. Total amount of offset was 13–14 cm. e–g A fault trace on a paved road with right-lateral offset of ca. 30 cm. h An open crack of a concrete block, whose width was ca. 5 cm after the largest foreshock and ca. 30 cm after the mainshockBack to article page