Sunset Crater

Sunset Crater is a cinder cone located north of Flagstaff in U.S. State of Arizona. The crater is within the Sunset Crater Volcano National Monument.

Sunset Crater is the youngest in a string of volcanoes (the San Francisco volcanic field) that is related to the nearby San Francisco Peaks.

Formation 
The date of the eruptions that formed the  was initially derived from tree-ring dates, suggesting the eruption began between the growing seasons of A.D. 1064–1065. However, more recent geologic and archaeological evidence places the eruption around A.D. 1085. The largest vent of the eruption, Sunset Crater itself, was the source of the Bonito and Kana-a lava flows that extended about  NW and  NE, respectively.  Additional vents along a  extending SE produced small spatter ramparts and a  to the east. The Sunset Crater eruption produced a blanket of ash and lapilli covering an area of more than  and forced the temporary abandonment of settlements of the local Sinagua people. The volcano has partially revegetated, with pines and wildflowers. The crater is the namesake for the Sunset Crater Beardtongue (Penstemon clutei). While the volcano is considered extinct, despite its young geologic age, due to the short-lived nature of cinder cones, the San Francisco volcanic field is still considered active, and a future eruption elsewhere in the area is a statistical certainty.

Damage from hikers forced the National Park Service to close a trail leading to the crater, but a short trail at the base remains.

The hiking trail below the summit skirts the substantial Bonito Lava Flow. This hardened lava is black and appears fresh as it has devastated the forest in its path.  The lava flow also created an ice cave or tube that is now closed to the public after a partial collapse.

2015 eruption scare 

On June 5, 2015, a website with satellite images reported steam rising from the crater, leading to fears that Sunset Crater was erupting. The cause of the steam was later determined to be a forest fire, and geologists stated that the volcano was extinct.

Sunset Crater Volcano National Monument 

Sunset Crater Volcano National Monument is a U.S. National Monument in the north-central part of the U.S. state of Arizona, created to protect Sunset Crater, a cinder cone within the San Francisco Volcanic Field.
The monument is managed by the National Park Service in close conjunction with nearby Wupatki National Monument. In 1928, a Hollywood film company - Famous Players-Lasky Corporation - planned to detonate large quantities of explosives on the side of Sunset Crater in order to create an avalanche for Zane Grey's motion picture, Avalanche. Public outcry over this plan led in part to the proclamation of Sunset Crater Volcano National Monument by President Herbert Hoover in 1930.

A 1-mile (1.6 km), self-guided loop trail is located at the base of Sunset Crater, but hiking to the summit is not permitted. A trail providing access to the summit and crater was closed in 1973 because of excessive erosion caused by hikers. A visitor center is located near the park entrance,  north of Flagstaff, Arizona, along U.S. Highway 89.

References

External links

 Sunset Crater National Monument at National Park Service
 Sunset Crater at USGS

Category:Landforms of Coconino County, Arizona
Category:Mountains of Arizona
Category:Cinder cones of the United States
Category:Volcanoes of Arizona
Category:Dormant volcanoes
Category:Protected areas of Coconino County, Arizona
Category:Mountains of Coconino County, Arizona