NEW : A first , slightly smaller quake hits about 30 minutes later in the same area . The second , stronger 9-kilometer deep earthquake did not set off tsunami warnings . It was centered about 550 kilometers ( about 550 kilometers ) This 5.1-magnitude tremor was about the same distance from Tokyo as the first and about 107 kilometers ( 66 miles ) east of Miyako -- which was among the areas devastated by the March 2011 earthquake and tsunami -- according to the U.S. Geological Survey . north-northeast of Japan . A stronger a quarter century quake triggered a tsunami that led to thousands of deaths .
NEW : A first , slightly smaller quake hits about 30 minutes later in the same area . The second , stronger 9-kilometer deep earthquake did not set off tsunami warnings . It was centered about 550 kilometers ( about 550 kilometers ) north-northeast of Japan . A stronger a quarter century quake triggered a tsunami that led to thousands of deaths .