The Agency said volcanic explosion occurred after earthquake several times in history and people should maintain vigilance against this tendency.

The number of earthquake above 6.0 M reached 77 on March. And 74 out of them occurred in quake-hit region, were aftershock. The number is 50 times over the same period last year. The largest aftershock on April 7 hit Japan has killed 4 people, injured at least 166, and caused a power outage over 2.61 million households, according to Japan's police officials.  The Meteorological Agency warned aftershocks above 6.0 M like the April 7 earthquake probably would hit Japan again. Meanwhile, quakes of the country's 20 volcanoes occurred more frequently after the massive March 11 earthquake, especially, the Fuji, Hakone, and Aso-San. [ IBT ]

Authorities in Japan on Friday announced a research findings which indicated chain earthquake over 9.0-magnitude might hit Japan and its offshore area.

A massive 9.0 magnitude earthquake hit off the northeastern coast of Japan on March 11, 2011, triggering a massive tsunami which caused alerts to go up along the pacific basin.

The National Police Agency reported at 10:00 a.m., April 8, the death toll rose to 12,731.  The number of reported missing declined to 14,706.