![]() 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. It certainly tossed us around a bit.The earthquake occurred about 20 miles southwest of Smith Valley, NV. I was in the middle of talking to a resident of the assisted living community I work for and you could just see the panic in their eyes when it started. But even just here it felt like the ceiling was going to come down. Rio Dell is without power, but I believe there is still water. Gage Dupper- who was displaced from the 6.4 earthquake in December after his home was shaken off its foundation, told Liz Kreutz in a text message, writing: Humboldt County 2nd District Supervisor Michelle Bushnell told ABC7 news anchor Liz Kreutz the power is out again in Rio Dell.Īnd according to PG&E power map, there are at least 500 to 4,999 customers without power based on the "orange squares" in the Rio Dell area. ![]() "The bridge is closed while we conduct safety inspections from today's New Year's Day earthquake." So far, there have no reports of any major damage or injuries.īut State Route 211 at Fernbridge, Humboldt County is closed as officials are assessing for any damage, Caltrans said. This comes nearly two weeks after a large 6.4 earthquake hit Humboldt County in Northern California, killing two people and injured about a dozen people. and struck 9.3 miles southeast of Rio Dell at a depth of 17.3 miles. (KGO) - A preliminary magnitude 5.4 earthquake struck in Humboldt County in Northern California on Sunday, according to the U.S. A preliminary magnitude 5.4 earthquake struck Humboldt County in Northern California near the site of December's 6.4 quake, according to the USGS.
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