A magnitude 5.8 earthquake struck  100 miles off the Northern California’s Lost Coast on Thursday morning – reported by the U.S. Geological Survey. The tremor was reported at 8:39 a.m. in the Pacific Ocean west of Capetown at a depth of about three miles. 

Paul Caruso, a geophysicist at the National Earthquake Information Center in Golden, Colo., said the USGS also recorded a 5.1-magnitude aftershock shortly after the first quake in the same area just before 9:30 a.m. However, the aftershock was unintentionally posted twice on the USGS website (as separate 5.1 and 5.3 quakes).

More comments from Caruso:

“The computers hadn’t sorted it out,” he said. “It happens. It’s more common than we would like it to be.”

“People may feel a little shaking, the chandeliers moving in the house,” he said. “We wouldn’t expect any severe damage.”

No one has called the city reporting damage, she said.

Caruso said that earthquakes in the ocean are monitored by using tsunami warning centers but that the 5.8 quake is “not even close” to being strong enough to trigger a tsunami. Usually, that would take at least a magnitude 7.0 or greater earthquake, he said.