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Global Volcanism Program | Image GVP-04629

The south wall of the 17 x 32 km Long Valley caldera, seen from Mammoth Mountain on the SE topographic caldera rim, is composed of Paleozoic and Mesozoic metamorphic and igneous rocks.  Recent seismic swarms and soil gas anomalies have occurred on the flat caldera floor in the center of the photo. Photo by Victoria Avery, 1996 (Smithsonian Institution).

The south wall of the 17 x 32 km Long Valley caldera, seen from Mammoth Mountain on the SE topographic caldera rim, is composed of Paleozoic and Mesozoic metamorphic and igneous rocks. Recent seismic swarms and soil gas anomalies have occurred on the flat caldera floor in the center of the photo.

Photo by Victoria Avery, 1996 (Smithsonian Institution).


Long Valley