Kanto-Chubu Region

a)On 16 May, in northern Ibaraki Prefecture [Kashima Nada sea], there was an M4.6 event (maximum seismic intensity 4) accompanying the subduction of the Pacific Plate, and on 8 May, an M4.4 event occurred at sea. Additionally, outside the current period, on 3 June in northeastern Chiba Prefecture (near Inubozaki), there was an M6.0 event (maximum seismic intensity 5 lower) accompanying the subduction of the Pacific Plate.

On 5 June, in the Reinan region of Fukui Prefecture, there was a shallow M4.7 event (with seismic activity of maximum seismic intensity 3).

On 7 June, off the coast of western Ishikawa Prefecture, there was seismic activity with the strongest event being a shallow M6.1 earthquake (maximum seismic intensity 5 lower).

Also, outside this area, on 10 June, in the sea near Torishima island [off the Tokaido coast], there was a deep M6.5 event (at a depth of 530 km).

Note: Within square brackets ([ ]) is the epicenter place name used by the Meteorological Agency in its information releases.

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,Science and Technology Agency

Seismic Activity in Japan May 2000