These explosive eruptions produced numerous craters. A dome grew on the lake floor and emerged to make Paoha Island. A sequence of earthquakes which began in 1978 generated much interest in Long Valley caldera and the Mono-Inyo Craters volcanic field and the possibility of an eruption. Volcanologists interpreted the earthquakes, accompanying ground deformation, and an increase in activity at fumaroles as an indication of magma movement beneath the caldera. The magma did not rise to the surface.
Volcanic unrest continues at Long Valley.
Additional details are provided on a USGS homepage. The Survey continues to monitor the caldera and provides current information on the Long Valley homepage. Nature, v. 376, p. 675-678.