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. While serious damage has not yet been reported from the epicenter, Lopez Obrador said authorities did receive reports of falling rocks.The earthquake occurred about 20 miles southwest of Smith Valley, NV. President Andres Manuel Lopez Obrador said there was no “significant damage” in Guerrero state, where Tuesday’s epicenter is located. That quake left a huge scar on the city, resulting in changes in building codes and greater protections against earthquakes. Two major quakes struck the country in September 2017, and on September 19, 1985, a magnitude-8.0 temblor killed an estimated 9,500 people in and around Mexico City. CFE said it was working to restore power to the impacted regions.Įarthquakes are not uncommon in Mexico because of its location at the edge of the North American tectonic plate. The city’s metro service said in a statement that train services had been resumed following a safety review.Īround 1.6 million customers were estimated to be without electricity in Mexico City and throughout four states, the country’s state-owned utility service, Federal Electricity Commission (CFE) said in a statement.
In a post on social media, Sheinbaum said that many people had lost electricity and authorities were working to restore power. Mayor Claudia Sheinbaum said there were no initial reports of major damage in the capital, which is about 231 miles (372 kilometers) from the epicenter. The lone fatality reported was a 19-year-old man named Eliodoro Hurtado, who died in the Mexican state of Guerrero. The National Oceanic and Atmospheric Administration initially issued a tsunami warning, but it was later called off. In Mexico City, alarms could be heard shortly before the ground started shaking. At least 92 aftershocks were recorded, including one with a magnitude of 5.2, the Mexican State Civil Protection Secretariat said. It was measured at an initial depth of 7.8 miles (12.6 kilometers). The United States Geological Survey said the 7.0 magnitude quake struck 2.5 miles (4 kilometers) east-northeast of Los Órganos de San Agustín, about eight miles from the Pacific Coast beach resort city of Acapulco. A powerful earthquake struck the southwest of Mexico late Tuesday, causing widespread shaking as far away as Mexico City and killing at least one person.
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