The earthquake occurred off the coast of Cape Mendocino near Humboldt County. There are reports of people feeling it as far away as San Francisco and Chico, California.
“It was slow at first, but then I really felt it,” Humboldt County Sheriff William Honsal told CNN. “We haven’t had an earthquake like this since 2010.”
The California Earthquake Early Warning System worked for those who signed up to get alerts on their mobile devices. Honsal estimates he received an earthquake warning between 10 and 15 seconds before he sensed the ground began shaking in California.
Humboldt County Emergency Services are currently assessing the damage. But they reported no injuries or catastrophic damage. Hounsal said some minor damage has been found in the buildings so far, including broken glass.
The agency said on Twitter that the California Office of Emergency Services was “actively monitoring” and “closely coordinating with its local counterparts in the area to protect communities from any secondary effects.”
Humboldt County is sparsely populated, with a population of approximately 135,000 people spread over approximately 10,300 square kilometres. The area is located near the California-Oregon border, about 434 kilometers north of San Francisco.
Several aftershocks have been observed since the initial quake, but a tsunami is not expected at this time, according to the mayor’s office.