Fig. 3
From: Triggered tremors beneath the seismogenic zone of an active fault zone, Kyushu, Japan
a Map view and vertical cross sections in N-S and E-W directions for the estimated tremor locations (red stars) and regular earthquakes (gray dots) that occurred during 2010–2013. Red bars in cross sections denote the 95 % bootstrap confidence intervals in the vertical direction. The blue rectangle shows the grid search area for hypocenter determination of the tremors with a size of 20 km horizontally and 40 km vertically. Orange diamonds are LFE events identified by JMA. b Map showing the 95 % bootstrap confidence intervals of the horizontal tremor locations. c Velocity structures used in this study