Mount Spurr volcano, 3,374 m (11,070 ft) high, is visible on the skyline 125 km (78 mi) west of Anchorage, Alaska. In 1992, three explosive eruptions from the Crater Peak vent of Mount Spurr blanketed south-central Alaska with several millimeters ( 1/16 - 1/8 inch) of ash and forced the closure of Anchorage International Airport for 20 hours. Photograph by R. McGimsey, U.S. Geological Survey, October 1, 1988.
Image courtesy of AVO / U.S. Geological Survey.