Earthquake Under the Ocean Area near Miyakojima on May 27

On May 27, 2020 at 18:19 (JST), there was an M5.2 earthquake (maximum seismic intensity 3) at a depth of 51 km under the ocean area near Miyakojima. The focal mechanism (CMT solution) showed a reverse fault with a compression axis in an NW-SE direction. This event occurred at the boundary between the Philippine Sea and the continental plates.
For the seismic activity since 1997, in the vicinity of the recent event (Area b), earthquakes of M5.1 or so have occurred with the 6-year interval in the average, including the recent event (repeating earthquake*).

* Repeating earthquake is that occurs repeatedly at almost the same place, with almost the same magnitude, and in almost the same interval. Also observed seismic waveforms show similar characteristics.

Japan Meteorological Agency
[Evaluation of Seismic Activities for May 2020 (June 9, 2020)]