'The quake occurred at 10:47 a.m. Pacific Standard Time, and vibrations steadily spread east like ripples in a pond, reaching the East Coast within about 16 minutes, according to Ground Motion Visualization.'
'Once the earthquake waves are far enough away from the location where the earthquake occurred, they can no longer be felt by people, but they can still be detected by sensitive seismic instruments,' the EarthScope Consortium wrote.
'It's suspected the quake occurred when two plates abruptly slid past one another, something known as a strike-slip fault,' the Geological Society of America wrote in a Facebook post.
'In the past century, there have been at least 40 other earthquakes of M6 or larger, including five earthquakes M7 or larger, within 250 km (155 miles) of today's earthquake,' the society said.
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