Okinawa Region

a) A fairly deep-focus M5.2 earthquake occurred on 25 February in the sea near Ishigakijima Island.

Note:
M=magnitude
N: total number of events in the figure
depth=depth of hypocenter
UND=Earthquakes of less than M1.0 and earthquakes whose magnitude was not recorded.
The key to the symbols shows on the left the size of an earthquake and on the right the depth of the hypocenter.

Japan Meteorological Agency

Seismic Activity in Japan February 2000