Tag: Sierra Nevada

WATCH: Rocks tumble down Sierra Nevada mountains after 6.0 quake & dozens of aftershocks rattle northern California

RT – July 9, 2021

A powerful 6.0 magnitude earthquake and dozens of aftershocks have struck the California-Nevada border area, triggering a rockslide in the Sierra Nevada mountain range and reports of shaking from San Francisco to Carson City.

The most powerful jolt, eventually upgraded by the US Geological Survey (USGS) to magnitud 6.0, happened at 3:49pm local time on Thursday, some 150 miles east of Sacramento. Within the next two hours, the area was rattled by over 50 aftershocks ranging between 2.5 and 4.6 on the Richter scale.

The quake was the “result of normal faulting in the shallow crust of the North America plate,” USGS said, noting however that there is a small chance this was a foreshock of a larger earthquake, according to CBS Sacramento.

The earthquake swarm occurred along the eastern edge of the Sierra Nevada, but witnesses reported shaking across much of Northern California, including the Sacramento region, and even as far away as San Francisco’s Bay Area and Carson City, Nevada.

The quake also triggered rockslides and a brief closure of Highway 395, where several cars were reportedly struck by rocks, though nobody was injured, according to the California Highway Patrol. Large boulders were seen scattered along the road in footage shared on social media.

Besides the rockslides, the state’s Office of Emergency Services said there were no immediate reports of major damage or injuries.

https://www.rt.com

More than 500 earthquakes rattle western Nevada after 6.5 hit less than a week ago

Amy Graff – May 20, 2020

The ground has come alive in a pocket of western Nevada.

A magnitude-6.5 earthquake rocked a remote region 35 miles west of Tonopah on May 15 and hundreds of aftershocks have followed — an event this corner of the county hasn’t seen in over half a century.

The initial big quake struck at 4:03 a.m. last Friday east of the Sierra Nevada, roughly halfway between Reno and Las Vegas, according to the U.S. Geological Survey. It was the largest to hit Nevada in 66 years and caused cracking along US 95 in Esmeralda County and broke some windows in Tonopah but, because this area is mostly unpopulated, damage was minimal.

A dozen aftershocks of 4.5 and above — and 500 quakes of 2.5 and above — have been recorded near Tonopah since the 6.5 quake. As recently as Wednesday morning, a 5.0 temblor struck.

“This is your classic shock-aftershock sequence,” said Dr. Graham Kent, director of the Nevada Seismological Laboratory. “This is similar to what you’d expect in the aftermath of the big quake.”

The 6.5 quake and following aftershocks occurred in the Walker Lane Seismic Region, a fault zone that roughly aligns with the Nevada-California border from Death Valley to Pyramid Lake.

Across time, Nevada has had an abundance of earthquakes and is considered the third most actively seismic state. The largest earthquake in state history was a magnitude 7.3 in 1915 and the next biggest was a 7.1 in 1932. In 1954 alone, the state saw five earthquakes of magnitude 6.5 or greater.

“And then it just went cold for 66 years,” Kent said. “We would tell people it’s all going to end and now it has. We knew sooner or later it would break and it broke in an area that’s not that populated.”

https://www.sfgate.com