Kanto-Chubu Region

a) An M5.1 earthquake occurred on 25 April in the vicinity of the Pacific-plate boundary in northern Ibaraki Pref. (maximum intensity: 4).

b) An M4.2 earthquake occurred on 25 April in northeastern Chiba Pref.

c) An M5.1 deep-focus earthquake occurred on 12 April off the coast of the Tokai area at a depth of 368km.

Furthermore, though it is outside of our time frame, an M4.7 earthquake occurred on 7 May in central Shizuoka Pref.

Japan Meteorological Agency,Science and Technology Agency

Seismic Activity in Japan April 1999