San Francisco Peaks Volcano Field

January 05, 2016


Photographer: Russell Losco 
Summary Author: Russell Losco
January 2016 Viewer's Choice
Pictured above at center is a cinder cone volcano in the San Francisco Peaks Volcano Field near Flagstaff, Arizona. The peak in the background is Humphrey’s Peak (12,637 ft or 3,852 m), an extinct stratovolcano and the highest point in Arizona. To its west but not in the photo is an extinct dome volcano. It's unusual to find these three different types of volcanoes within the same area, especially since they originate from different types of magma. The magma from a dome volcano is highest in silica, whereas magma from the stratovolcano has silica levels between that of the dome volcano and the cinder cone volcano. Consequently, dome and stratovolcanoes are known for violent eruptions while the cinder cones, though often explosive, are generally less violent. Photo was taken on January 3, 2014, from the flank of S P Crater.
Photo Details: Camera Maker: Panasonic; Camera Model: DMC-FZ70; Image Date: 2014-01-03 13:55:03 (no TZ); Focal Length: 8.7mm (35mm equivalent: 50mm); Aperture: ƒ/4.5; Exposure Time: 0.0006 s (1/1600); ISO equiv: 100.