A man rides his bike at darkness after a magnitude 7.1 earthquake in Yamagata, northern Japan, on April 8. A major earthquake shook the northeast of Japan late on Thursday, and a tsunami warning was issued for the coast already devastated by last month's massive quake and tsunami that crippled a nuclear power plant.

The quake hit about 11:30 p.m. Thursday Japan time. It has rattled nerves nearly a month after the devastating earthquake and tsunami that flattened the northeastern coast.

Announcers on Japan's public broadcaster NHK had told residents in the northeast to move to higher ground away from the shore.

Honshu is located in the same general area as the recent 9.4 Sendai earthquake. The quake is estimated to be 25 30.1 miles below sea level. A tsunami wave is estimated to be one meter high (3.28 feet). The reports are very early. Fox is just reporting that this 7.4 quake is the largest aftershock since the 9.4. I will have ongoing updates as available – see them below – the latest first.