Mount Spurr
Mount Spurr from the south
Elevation:	11,066 feet (3,374 metres)
Location:	Alaska, USA
Range:	Tordrillo Mountains, Alaska Range
Coordinates:	61°17′59″N, 152°15′05″W
Topo map:	USGS Tyonek B-7
Type:	Stratovolcano
Age of rock:	< 10000 yr
Last eruption:	1992

Mount Spurr is a volcano in the Aleutian Volcanic Arc of Alaska, named after United States Geological Survey geologist and explorer Josiah Edward Spurr, who led an expedition to the area in 1898. Mount Spurr, Alaska; picture from US Geological Survey, found here: [1] File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... A topographical summit is a point on a surface which is higher in elevation than all points immediately adjacent to it. ... Official language(s) English Capital Juneau Largest city Anchorage Area  - Total  - Width  - Length  - % water  - Latitude  - Longitude Ranked 1st 1,717,854 km² 1,300 km 2,380 km 13. ... The most general definition of a mountain range is a group of mountains bordered by lowlands. ... View of Mount McKinley on a rare clear day The Alaska Range is a mountain range that extends for about 650 km (400 mi) across south-central Alaska, from Iliamna Lake at the SW end to White River in Canada at the SE end. ... Map of Earth showing lines of latitude (horizontally) and longitude (vertically); large version (pdf) The geographic (earth-mapping) coordinate system expresses every horizontal position on Earth by two of the three coordinates of a spherical coordinate system which is aligned with the spin axis of the Earth. ... Example of a topographic map with contour lines Topographic maps, also called contour maps, topo maps or topo quads (for quadrangles), are maps that show topography, or land contours, by means of contour lines. ... The United States Geological Survey (USGS) is a scientific agency of the United States government. ... Mountains can be characterized in several ways. ... A stratovolcano is a tall, conical mountain (volcano) composed of both hardened lava and volcanic ash. ... // The geologic time scale is used by geologists and other scientists to describe the timing and relationships between events that have occurred during the history of the Earth. ... A volcano is a geological landform usually generated by the eruption through a planets surface of magma, molten rock welling up from the planets interior. ... 1992 (MCMXCII) was a leap year starting on Wednesday. ... A volcano is a geological landform usually generated by the eruption through a planets surface of magma, molten rock welling up from the planets interior. ... Looking down the Aleutians from an airplane. ... Official language(s) English Capital Juneau Largest city Anchorage Area  - Total  - Width  - Length  - % water  - Latitude  - Longitude Ranked 1st 1,717,854 km² 1,300 km 2,380 km 13. ... The United States Geological Survey (USGS) is a scientific agency of the United States government. ... Josiah Edward Spurr (1870-1950) was an American geologist, explorer, and author. ... 1898 (MDCCCXCVIII) was a common year starting on Saturday (see link for calendar) of the Gregorian calendar (or a common year starting on Monday of the 12-day-slower Julian calendar). ...

The current volcano sits on top of the remains of an old volcano that was destroyed in a giant debris avalanche about 10,000 years ago. Spurr has erupted twice in historic times: in 1953 and again in 1992. Both eruptions led to falls of volcanic ash in the city of Anchorage, Alaska 130 km (81 miles) to the east. As with other Alaskan volcanoes, the proximity of Spurr to major trans-Pacific aviation routes means that an eruption of this volcano can significantly disrupt air travel. Volcanic ash can melt inside jet engines, causing them to fail. 1953 (MCMLIII) was a common year starting on Thursday (link is to a full 1953 calendar). ... 1992 (MCMXCII) was a leap year starting on Wednesday. ... Diamond Head, a well-known backdrop to Waikiki in Hawaii, is an ash cone that solidified into tuff Volcanic ash is the term for very fine rock and mineral particles less than 2 mm in diameter that are ejected from a volcanic vent. ... Nickname: The City of Lights and Flowers Official website: www. ... A Pratt and Whitney turbofan engine for the F-15 Eagle is tested at Robins Air Force Base, Georgia, USA. The tunnel behind the engine muffles noise and allows exhaust to escape. ...

Recent activity

On July 26, 2004, the Alaska Volcano Observatory (AVO) raised the "Color Concern Code" at Spurr from green to yellow due to an increasing number of earthquakes. Earthquakes beneath a volcano may indicate the movement of magma preceding a volcanic eruption, but the earthquakes might also die out without an eruption. In the first week of August 2004, the AVO reported the presence of a collapse pit, filled with water forming a new lake, in the ice and snow cover on the summit. This pit may have been caused by an increase in heat flow through the summit lava dome. July 26 is the 207th day (208th in leap years) of the year in the Gregorian Calendar, with 158 days remaining. ... It has been designated the: International Year of Rice (by the United Nations) International Year to Commemorate the Struggle against Slavery and its Abolition (by UNESCO) 2004 World Health Day topic was Road Safety (by World Health Organization) Year of the Monkey (by the Chinese calendar) See the world in... Global earthquake epicenters, 1963–1998 An earthquake is a sudden and sometimes catastrophic movement of a part of the Earths surface. ... Magma is molten rock often located inside a magma chamber beneath the surface of the Earth. ... This article is about volcanoes in geology. ...

On May 3rd, 2005, a debris flow was observed in webcam images, as well as by a nearby pilot. A subsequent overflight revealed that much of the sitting pond within the melt hole had drained away, a notable depth loss from that observed in an overflight on April 25th.

On September 16th, 2005, AVO included in a weekly update that the current activity at Mount Spurr is declining. A number of factors, including a change of the greenish color in the "melt hole" to one more natural, as well as a down turn in local seismic activity, has led to this conclusion.

Map showing volcanoes of southcentral Alaska.

Map of Alaska volcanoes. ... Map of Alaska volcanoes. ...

External links

• Siebert, L. and T. Simkin (2002-). Volcanoes of the World: an Illustrated Catalog of Holocene Volcanoes and their Eruptions. Smithsonian Institution, Global Volcanism Program Digital Information Series, GVP-3. URL: http://www.volcano.si.edu/world/
• Volcano World article about Spurr
• Alaska Volcano Observatory

• Maps and aerial photos
  • Topographic map from TopoZone
  • Aerial image from TerraServer-USA
  • Surrounding area map from Google Maps
  • Location in the United States from the Census Bureau

• Mount Spurr Webcam