Fig. 9From: Distribution of low-frequency earthquakes accompanying the very low frequency earthquakes along the Ryukyu TrenchTime–space plot of low-frequency earthquake (LFE) swarm in the Okinawa area. The swarm is plotted when the number of events was >18. The plotted area and annotations of C and D are denoted in Fig. 6b. Red circles show the LFEs. Arrows and dotted lines show the direction of LFE migration and its error range, respectivelyBack to article page