The Mono Lake volcanic field east of Yosemite National Park and north of the Mono Craters in central eastern California is a series of cinder cones in Mono Lake and on its shore. It is one of the most recently active volcanoes in California, the last eruptions having occurred at Paoha Island only 100 or 230 years ago. Paoha Island's eruption was the appearance of a so-called cryptodome - a shallow intrusion of a viscous rhyolitic magma body that uplifted the lake bottom sediments.
Earthquakes near Volcanoes: Our world-wide map continuously detects shallow earthquakes near volcanoes. These could be early signs of unrest and often precede eruptions.
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