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M4.4 "Sierra Block" earthquake west of Mammoth Lakes

At 10:36:54 PST (18:36:54 UTC on) 1 February, a M4.4 earthquake occurred under McGee Mountain near Toms Place, CA, at a depth of 10 km.

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CalVO announces Dr. Andy Calvert as new Scientist-in-Charge

After 36 years with the USGS and 7 years as the Scientist-in-Charge of CalVO, Dr. Margaret (Maggie) Mangan will be stepping down from leading the...

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USGS Hazard Science – Understanding the Risks is Key to Preparedness

 Learn About USGS Hazards Science and More About National Preparedness Month:  The very nature of natural hazards means that they have the potential...

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New names at Newberry drawn from CalVO geologist's mapping

In June 2019, the U.S. Board on Geographic Names approved twenty-five new formal geographic names at Newberry Volcano in central Oregon. The names...

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Earthquake swarm south of Coso Volcanic Field continues with declining intensity. We continue to monitor

The seismic activity that started on the evening of July 5 at the southern margin of Coso Volcanic Field in Inyo County, California continues at a...

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Earthquake swarm south of Coso Volcanic Field related to tectonic, not volcanic, activity. We continue to monitor.

An earthquake swarm started on the evening of July 5 at the southern margin of Coso Volcanic Field in Inyo County, California.

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The National Volcano Early Warning System (NVEWS) will help USGS better monitor nation’s most dangerous volcanoes

In September 2004, USGS scientists detected sudden, but unmistakable, signs that Mount St. Helens was waking up. Volcano monitors had picked up the...

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CalVO researchers collaborate with Yellowstone Volcano Observatory to determine rhyolite lava eruption intervals in caldera

In addition to studying volcanic processes and their associated hazards in California and Nevada, scientists at the California Volcano Observatory...

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Voluminous Pleistocene basalt flows in northern California erupted within a few hundred years of each other

Scientists at the volcano observatories of the U.S. Geological Survey pay close attention to volcanoes of the Cascade Range, Alaskan Peninsula and...

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New geochronology reveals the volcanic history of Mono Craters

The Mono Craters, a line of volcanic domes and craters south of Mono Lake in eastern California, represent the youngest rhyolitic volcanoes in the...

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New report details what's in harm's way near California's volcanoes

The potential for damaging earthquakes, landslides, floods, tsunamis, and wildfires is widely recognized in California.

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USGS Director visits CalVO

During a tour of western USGS offices, Director James F. Reilly II visited the CalVO offices and operations center in Menlo Park, CA.

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