Low-frequency earthquakes along the Ryukyu Islands triggered by teleseismic earthquakes

Abstract Tremors and low-frequency earthquakes (LFEs), which occur in the plate interface, can provide useful information about state of aseismic stress transfer mega-earthquake fault zones. We estimated distribution triggered LFEs subducted interface. Specifically, we detected Ryukyu Trench by surface waves large teleseismic using waveform records broadband short-period seismometers installed Arc. selected a total 45 with magnitudes more than 7.5, occurred between 2004 2017, for analysis. could detect five earthquakes. Then, determined hypocenters relative arrival times each station. The were distributed south Okinawa Island Yaeyama area. Moreover, they around source slow slip events. These almost same as concentrated near to locations most active LFE clusters accompanying very earthquakes, suggesting higher sensitivity inducing these clusters. This indicates that VLFEs are activated acceleration areas.