A magnitude 6.8 earthquake hit the Gulf of California on Saturday, but officials said there was no danger of a tsunami in the western U.S..

The temblor struck about 47 miles offshore southwest of Etchoropo in Mexico’s Sonora state and about 500 miles south of Phoenix, according to the U.S. Geological Survey.

The epicenter of the quake was 10 kilometers deep in the Sea of Cortez. Emergency services in Mexican Sonora and Sinaloa states said there were no immediate reports of casualties and it was not yet clear how the quake had affected Baja California Sur.

It was felt in several coastal cities, according to the USGS.

The Pacific Tsunami Warning Center said the earthquake would not cause tsunami activity in California, but it said larger waves were possible closer to the epicenter.

According to the USGS, Mexico – which is located atop three of the large tectonic plates – is one of the world’s most seismically active regions.

The area west of the Gulf of California, including Mexico’s Baja California Peninsula also sees its share of earthquake activity due to the Pacific and North American Plates grinding past one another, creating strike-slip faulting, the southern extension of California’s San Andreas Fault, according to the USGS.

On August 21, two strong 6.0 magnitude quakes hit central and southern Mexico, causing extensive damage. One of the earthquakes affected the capital of Mexico City and the resort city of Acapulco, prompting the evacuation of hundreds of people. Numerous injuries were reported.

The country’s deadliest natural disaster occurred in September 1985 when an 8.1 magnitude earthquake killed more than 9,500 people in Mexico City

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