The quake followed several minor quakes earlier in the day, including a 4.7 magnitude foreshock.
The earthquake, which occurred at 1:42 a.m., had a preliminary magnitude of 2.6, making it a minor quake.
Through these instruments, the center records 40 quakes a day, most of them minor.
Except there was a minor sea-floor quake a few kilometers away from the yacht.
The third earth tremor was vastly more powerful than the two minor quakes they'd felt earlier.
Mildred pointed them out to the others, commenting on the minor quake they'd all experienced.
The Appalachians are some of the most stable areas in the world, but we still get minor quakes.
Sonya had just gotten back on her feet when another minor quake shook the ground beneath her.
"I think," she told him, "we just experienced a minor quake."
More minor quakes had preceded the large event, including two in April and October respectively.