![]() That's my first outside earthquake and I've lived in Humboldt my whole life," Graves said. My coworker was inside the store and she went out and I just rode it out outside. "Well, you know, I was out back taking a break, smoking a joint, and that's when it hit for me. She said she had just stepped outside the store when the earthquake hit. Yeah, so my pantry at home is all messed up," Graves said. "Yes, there are broken wine bottles and other products - one of them very stinky. ![]() Some items had fallen from store shelves, though. Other reports around town were similar, with no serious damage, she said. Kaitlin Graves, who works at the Petrolia General Store, said there didn't appear to be any serious damage from the quake. Some roads in Humboldt County had been closed due to damage from the quakes, the sheriff's office said, those included Redwood Drive between Evergreen Road and Bear Canyon Road due to a rockslide and Mattole Road near Postmile 11 due to rockslide. "There is no threat of tsunami at this time," the Humboldt sheriff's office said. The Humboldt County Sheriff's Office said there were numerous smaller aftershocks recorded around Petrolia, Ferndale, Shelter Cove and Rio Dell. about northeast of Petrolia and registered 3.8, the USGS said. The most recent quake happened shortly before 2 p.m. about 13 miles west of Petrolia and registered 4.0 in intensity, according to the USGS. The first quake hit shortly before 7 a.m. The quake was one of a cluster of some 24 quakes that ranged from less than 3.0 in intensity to more than 6.0. Petrolia is about 50 miles south of Eureka. about 24 miles west of Petrolia in Humboldt County. Geological Survey said the quake happened at about 12:10 p.m. Learn more about the USGS Earthquake Hazards Program and ShakeAlert.An earthquake that measured 6.2 in magnitude off the coast of California could be felt as far inland as Redding early Monday afternoon. ![]() Visit the and Twitter accounts for the latest updates. The USGS operates a 24/7 National Earthquake Information Center in Colorado that can be reached for more information at 30. If you felt this earthquake, report your experience on the “USGS Did You Feel It?” website for this event. ![]() The Wireless Emergency Alert system did not distribute alerts for the earthquake because the underestimation of the quake meant it did not reach the system's threshold of alerting for earthquakes that are M5.0 or stronger. App providers, including MyShake, and QuakeAlertUSA, as well as Google Android have an alerting threshold of M4.5. The apps also sent alerts for a M4.6 aftershock at 23:33 UTC (4:33 pm local time) that was correctly located. ShakeAlert Messages were distributed via app partners for the inaccurately located M4.8 (near Stockton) that occurred as shaking from the M6.0 travelled across the state. As the USGS builds more stations, it expects to see most of these issues resolved. The system is constantly growing and learning from events like these. This can cause issues like inaccurately locating and miscalculating the quake. The system initially thought it was detecting three different smaller earthquakes rather than one larger one. With relatively few seismic stations in this part of California, earthquake waves have to travel further to be detected. The ShakeAlert Earthquake Early Warning System detected the earthquake 25.6 seconds after it started, but under-estimated the magnitude as a M4.8 at an estimated location that was about 31 miles (50 km) south of the actual location. For estimates of casualties and damage, visit the USGS Prompt Assessment of Global Earthquakes for Response (PAGER) website. Visit the USGS earthquake event page for more information. The USGS is coordinating its response with the California Geological Survey and the University of Nevada at Reno. USGS scientists expect that this event will trigger aftershocks, but these will decrease in frequency over time. The event was widely felt, with over 25,000 "Did You Feel It?" reports thus far submitted. The quake is a result of normal faulting at approximately 6.2 miles (10 km) depth near the Antelope Valley fault, which runs north-south along the Sierra Nevada range front. Perceived shaking for the quake was very strong. The earthquake occurred about 20 miles southwest of Smith Valley, NV.
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