Update: The meteorological service has said there is no second tsunami.
Another tsunami spotted off the coast of Fukushima - the site where the distressed nuclear plants are located. And an explosion occurred at Daiichi Nuclear Power Plant unit 3 ("The Nuclear and Industrial Safety Agency says a hydrogen explosion occurred Monday morning at the No.3 reactor at a nuclear power plant in Fukushima prefecture." via news banner atop NHK World news page). Meanwhile, rescue temas from 9 countries arrive in Japan to assist in relief operations.
What a bloody mess.
For those who may want to help, Shelterbox is on the ground in Japan. Donations to them are one of many possible ways to try to help.