Nearly a million homes suffered blackouts in Japan’s northeast Friday after a new earthquake killed three people and piled more misery on a region buried under the rubble of last month’s devastating tsunami. The northeastern coast was still reeling from the destruction wrought by a jumbo 9.0-magnitude earthquake on March 11, with tens of thousands of households without power or water. The 7.1-magnitude aftershock Thursday threw even more areas into disarray and sent communities that had made some gains back to square one.