Fig. 2

Identified linear surface ruptures. a Small solid lines show identified linear surface ruptures. Numbers correspond to the number of each figure shown later, and the rectangle with the number shows the area of each figure. Red dashed lines show known active faults (Nakata and Imaizumi 2002; Research group for active tectonics in Kyushu 1989). Long, narrow orange area shows the InSAR decorrelation zone along the Futagawa fault zone. Ellipses approximate the areas of each linear surface rupture group classified by location and features. b Small solid lines show identified linear surface ruptures. Long, narrow orange area shows the InSAR decorrelation zone along the Futagawa fault zone. Small circles and triangles show epicenters from April 14 to April 23, and beach ball diagrams are from JMA (2016a, b). Red lines show surface ruptures identified by field survey (Geological Survey of Japan 2016)