Fig. 1From: Distribution of low-frequency earthquakes accompanying the very low frequency earthquakes along the Ryukyu TrenchDistributions of very low frequency earthquakes (VLFEs) and observation stations within the study area. a IR Iriomote Island, OE Okinoerabu Island, OK Okinawa Island, AM Amami Island. Red ovals show the major clusters of VLFEs (Nakamura and Sunagawa 2015). Small gray circles show the hypocenters of the ordinary earthquakes whose amplitudes were compared with those of the LFEs in Fig. 11. b Enlarged area for the Yaeyama region. Open squares show the F-net stations; solid squares show the JMA stations. c Same as b but for the Okinawa areaBack to article page