Japanese residents were rattled again by a 7.1 quake that struck off the island nation's eastern coast Thursday, less than one month after being devastated by a 9.0-magnitude earthquake and tsunami.
Initially, the temblor prompted Japan meteorological agency to issue a tsunami warning for Miyagi prefecture, already in shambles as a result of the March 11 tsunami. Officials have now lifted that alert.
According to Paul Caruso, a geophysicist at the U.S. Geological Survey in Golden, Colo., Thursday's aftershock struck at about the same location and depth as the March 11 quake.
While hundreds of aftershocks have shaken Japan's northeast region since last month's earthquake and subsequent tsunami, few have been stronger than 7.0 magnitude.
Meanwhile, there appears to be no new signs of problems at the tsunami-ravaged Fukushima Dai-ichi nuclear plant as a result of Thursday's temblor.