ShakeAlert ® is a network of sensors that collects and shares real-time information about the magnitude, location and expected shaking from earthquakes on the West Coast to distribution partners who then deliver alerts via cell phones and the internet. In California, the earthquake early warning system is overseen jointly with the California Governor’s Office of Emergency Services. More than 3 million people were alerted to the earthquake just before early Tuesday morning via the ShakeAlert ® Early Warning System, a system created by the USGS and partners to potentially alert people that shaking from an earthquake is on its way.
Respondents in Eureka, the closest city to the epicenter, reported very strong shaking, but people hundreds of miles away in San Jose, CA, Reno, NV, and Klamath Falls, OR also reported weak shaking. More than half of those reports came in within an hour of the earthquake. “Long-time residents have likely experienced many local earthquakes and the associated intense shaking.”īy 9 am Pacific time, more than 4500 people had responded on USGS’s “Did You Feel It?” report. “This area is the most seismically active part of California,” said Keith Knudsen, Deputy Director of the USGS Earthquake Science Center.
Map of "Did You Feel It?" responses for the Decemearthquake near Ferndale, CA. In the past century, there have been at least 40 other earthquakes of magnitude 6 or larger, including six earthquakes magnitude 7 or larger, within roughly 150 miles of today’s earthquake. Earthquakes are common in this area because it's close to where the Pacific, North America, and Juan de Fuca plates meet, a spot known as the Mendocino Triple Junction. In fact, a sequence of overlapping earthquakes of magnitude 6.2 and 5.7 occurred nearby almost exactly a year ago on December 20, 2021. This region has a history of abundant seismic activity. These aftershocks are likely to occur only in the area where the earthquake and aftershocks are already occurring. Smaller aftershocks are likely to continue over the next week, with scientists currently predicting up to 24 magnitude 3 or higher aftershocks. USGS scientists have issued an aftershock forecast which currently indicates a 13% chance of aftershocks of this size or greater within the next week. There have not yet been any aftershocks at magnitude 5 or higher, the size that typically results in damaging shaking. The National Weather Service has ruled out a tsunami risk.Īs of 2:30 pm local time on December 20, there have been 14 aftershocks above magnitude 3, the size where they can typically be felt near the epicenter. Two individuals have died as a result of medical emergencies occurring during and/or just following the earthquake and an estimated 11 individuals have been reported as injured, as of the time of publication. The earthquake’s strong shaking near the epicenter (described in the ShakeMap for this event) caused widespread damages to roads and homes and power outages, according to the Humboldt County Office of Emergency Services. The earthquake occurred about 10 miles (15 kilometers) southwest of Ferndale, California.įerndale is located in Humboldt County on the Redwood Coast of Northern California, about 60 miles south of the Oregon border and 200 miles north of the San Francisco Bay Area. Geological Survey reported today that a magnitude 6.4 earthquake struck 3 miles offshore in Northern California on Decemat 2:34 am local time (December 20 10:34 UTC) at a depth of 11 miles (18 kilometers). The California Integrated Seismic Network and the U.S.
0 kommentar(er)
