There have been recent rumblings at the Long Valley caldera, a depression in eastern California next to Mammoth Mountain; on Feb. 11, 2014, the 20-mile-long, 3,000-feet-deep valley, one of the ...

Looking to camp out nearby an enormous ancient volcanic crater? Turns out that odd notion is something adventurous travelers ...

Types of volcanoes. Here are the types of volcanoes in California, as per USGS: Cinder Cone Volcanoes. Cinder Cones are the simplest type of volcano, formed by the accumulation of tephra — ash ...

The four types of volcanoes are composite, cinder cone, plug dome and shield. The park’s website notes, “every rock at Lassen originates from volcanoes.” Is ‘Lassen Volcano’ still active?

Cinder cones. Volcanoes are the geology that shaped the Pacific Northwest ... cinder cones and at least 22 caves on the northern side of the Medicine Lake volcano. It is near Tulelake, California, ...