Fig. 5
Comparison of focal mechanism distribution between F-net and this study. Focal mechanisms are shown by beach ball symbols and their sizes are proportional to their magnitudes. Epicenter distributions are from the JMA catalog and shown by dots. a F-net (NIED) focal mechanism solutions (Mw ≥ 3.2) and epicenter distribution. Period shown is 2005–2013. E–W compressional reverse-faulting events are dominant in this region. b Focal mechanisms determined in this study and epicenter distribution. Period shown is April 2011 to June 2013. Focal mechanisms are colored according to the classification shown in Fig. 3. We successfully determined 854 reliable focal mechanism solutions