![]() ![]() Learn more about the USGS Earthquake Hazards Program and ShakeAlert. 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. Northern California has had: (M1.5 or greater) 7 earthquakes in the past 24 hours. ![]() 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. This map depicts the recent and historic seismicity in three ways. Historic accounts indicate more than 360 earthquakes of M5.5 have occurred in this region between 18. 4.1 earthquake - 15 mi north of Brawley, Imperial County, California, USA, on Tuesday, at 10:38 pm (GMT -7).The earthquake occurred about 20 miles southwest of Smith Valley, NV. Each year seismic networks record more than 30,000 earthquakes with magnitudes (M) as small as 1.0 in California and Nevada. The strongest earthquake in Southern California past month occurred 2 days ago: Moderate mag. ![]() Click on an earthquake on the above map for more information. What was the strongest quake in Southern California past month? Recent Earthquakes in California and Nevada San Francisco Special Map. ![]() In the past 30 days, Southern California, USA had 61 quakes up to magnitude 4.1. How many quakes were there in Southern California past month? 3.0 earthquake - 12 mi east of Yucaipa, San Bernardino County, California, USA, on Friday, at 8:20 am (GMT -7). The last earthquake in Southern California occurred 40 minutes ago: Light mag. When was the latest earthquake in Southern California? The reason there are so many active faults is the side-wise movement along the San Andreas and its associated faults systems that separate the Pacific and North American tectonic plates. Many larger and smaller faults crisscross the region and cause frequent smaller and occasionally larger earthquakes. Geological Survey and the Los Angeles Fire Department, the earthquake. Southern California is one of the country's seismically most active areas. 1:05 A magnitude 4.2 earthquake shook Southern California early Wednesday, officials said. Faults and earthquake epicenters in western Southern California (image: ) Greater Los Angeles Area, California has had: (M1.5 or greater) 2 earthquakes in the past 24 hours. ![]()
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