Lava Flows
Lava Flows
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Vertical columns of volcanic rock at Devils Postpile National Monument
A spectacular display of a columnar-jointed basalt flow.
Long Valley Caldera Field Guide - Glass Creek Flow
Example of two magmas that mixed during an eruption.
Long Valley Caldera Field Guide - Lookout Mountain
A good vantage point for viewing the region.
Long Valley Caldera Field Guide - Mammoth Mountain
Hike, ski, or bike on a series of domes. A good vantage point for seeing entire Caldera.
Long Valley Caldera Field Guide - Obsidian Dome
At the top of an obsidian dome, view rocks that look different but have the same composition.
Geologic history of the Long Valley, Mono Basin region
Geologic history of the Long Valley, Mono Basin region.
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.
Lava Flows, Domes and Dome Collapses
Future lava flows in the Long Valley area will be either relatively fluid (basalt lava) or viscous (dacite or rhyolite lava).
Possible eruption sequence for the Long Valley-Mono Lake area
Possible eruption sequence for the Long Valley-Mono Lake area.
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.
Features of the Long Valley Caldera
The broad depression of Long Valley Caldera that we see today is much shallower and a little larger in diameter than it was immediately after its formation about 760,000 years ago.
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.