A Fairly Big One
…Or at least a long one. An earthquake just hit, lasting at least a minute, and it was pretty strong. Will update when I know more.
I felt it while laying down in bed for a rest (before going out on a Costco run), and it felt stronger than most I recall. I went out to the kitchen, where I have a hanging lamp that I use as a primitive earthquake meter, and it was going pretty strong–and then noticed that an open door was swinging a bit as well, and the building was creaking.
Update (3:19pm): Okay, reports are coming in that it was a 5.2 off the coast of Chiba (image from HiNet. Apparently, it was felt strongest in Yokohama (from reports on NHK so far).
Update (3:30pm): Tenki.jp is now reporting that the quake was 5.5 on the Richter scale. NHK shows that Chiba and south Kanagawa felt it strongest (using the Japanese quake strength scale), and that there is no expectation of tidal waves.
Update (7/18): HiNet has reclassified the quake as being 5.8 on the Richter scale; other reports hold it at 5.5.
Felt it pretty strongly here in Odawara, the teevee said the center was Izu.