California Geological Survey geologists map rare earth minerals in the Mojave National Preserve.
Tag: California Geologic Survey
CGS Geologists Assess Multiple Fire Burn Areas for Landslide Potential: 10-1-20 Update
Wildfires are a disaster that can spawn yet another disaster. Fire eliminates ground covering on slopes, exposing the soil underneath and making it more susceptible to debris flows. Such events can be catastrophic, as was the case in Montecito (Santa Barbara County) in 2018. David Longstreth, senior engineering geologist in California Geological Survey’s (CGS) Forest and Watershed Geology program, is one…
California Geological Survey Shares Expertise During Nevada’s Largest Temblor in 65 Years
The largest earthquake in Nevada in 65 years drew plenty of attention at the California Geological Survey (CGS) – not because it caused significant damage – but because it helps paints a clearer picture of what’s going on under the Earth’s surface in the east/central part of our state. That’s important for an institution that…
The Mammoth Lakes Earthquakes – 40th Anniversary
On May 25, 1980–nearly one week after the spectacular eruption of the Mount St. Helens volcano–at 9:33 a.m. PST, a magnitude 6.0 earthquake rocked through Mammoth Lakes, California. During the next 16 minutes, four more shocks, magnitude 4.1 – 5.5 followed. This seismic activity was the beginning of an earthquake sequence that produced 72 magnitude…