Deformation
Deformation
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Long Valley Caldera Field Guide - Mammoth Mountain
Hike, ski, or bike on a series of domes. A good vantage point for seeing entire Caldera.
Volcano Hazards in the Long Valley - Mono Lake Area, California
Volcanic unrest through the 1980's to 1990's in the southern part of the Long Valley caldera reminds us that the volcanic system is young. Volcanic activity and related hazards are likely in the future. USGS scientists closely monitor the area and research past activity to better understand what might happen in the future.
Deformation measurements at Long Valley Caldera
When magma moves into a volcanic system, and closer to the surface of the earth, the area surrounding the volcano may move upward and outward. This swelling is typically measured using the Global Positioning System (GPS) and tiltmeters (tilt).
Long-term outlook for volcanic activity in Long Valley caldera
The area of eastern California that includes the Long Valley Caldera and the Mono-Inyo Craters volcanic chain has a long history of geologic activity that includes both earthquakes and volcanic eruptions. This activity is likely to continue long into the future.
Resurgent Dome in the Long Valley Caldera, California
The resurgent dome is a broad area of the central caldera floor that was pushed upward within 100,000 years or less of the caldera-forming eruption 760,000 years ago.
Post-caldera flows and domes, Long Valley Caldera, California
Since the enormous explosive eruption formed the caldera about 760,000 years ago, hundreds of smaller eruptions have partially filled the initially deep depression.