<strong>2011</strong> Kesennuma and much of northeastern Japan were struck by a magnitude 9.0 earthquake and the tsunami that it set off.Credit...Shiho Fukada for The New York Times But others argue that the long-term impact on Japan will be more limited — so long as the troubled reactors at the Fukushima Daiichi Nuclear Power Station, about 170 miles north of here, do not suffer a complete meltdo