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Volcanoes -- California


USGS Long Valley Observatory

The still active Long Valley Caldera, California, the topic of this site, is under study and monitoring by the US Geological Survey (USGS). Featured data of this Website include current conditions, long-term outlook, volcanic activity of the Mono Lake area, and earthquake, deformation, and gas emission and geothermal activity. The graphs, figures, and tables are updated regularly with the newest...