Happy Anniversary, Shishaldin 1967 and 2014!
Posted: January 28, 2015
Shishaldin in June, 2014
Today is a double anniversary of eruptions at one of Alaska’s most active and beautiful volcanoes: Shishaldin.
One year ago, the current period of unrest and low-level Strombolian eruption deep within the summit crater commenced. The first sign of activity was an increased surface temperature detected from satellite. The 2014-2015 eruption has been monitored primarily using AVO’s satellite image tracking system, as the seismic network at Shishaldin has been hampered by technical problems for a portion of this period. AVO also uses a web camera and infrasound detection and ground coupled air waves – essentially the detection of pressure waves in the atmosphere produced by explosions at the volcano – to evaluate and track ongoing activity. The current eruption has not had much impact on the surrounding terrain or air traffic. Localized dustings of ash and ballistics on the flank of Shishaldin attest to the vigor of some of the explosions during the last year. As occurred in 1999, however, Shishaldin is capable of significant explosions that send ash high into the atmosphere, and for that reason AVO remains vigilant for intensification of the activity. Read the full version
New Publication on Aniakchak Volcano Available Online
Posted: December 30, 2014
AVO would like to announce a new, richly-illustrated online publication that describes the volcanic geology and geochemistry of one of Alaska’s most spectacular volcanoes, Aniakchak! The USGS has just released Professional Paper 1810: Postglacial Eruptive History, Geochemistry, and Recent Seismicity of Aniakchak Volcano, Alaska Peninsula.
The report presents what is known about the recent eruptive history of this large, explosive volcano and interprets a large geochemical data set and recent seismic data collected by AVO to present a model of the Aniakchak magmatic system.
The full citation and web link to find the PDF copy of both the report and data tables are here
Bacon, C.R., Neal, C.A., Miller, T.P., McGimsey, R.G., and Nye, C.J., 2014, Postglacial eruptive history, geochemistry, and recent seismicity of Aniakchak volcano, Alaska Peninsula: U.S. Geological Survey Professional Paper 1810, 74 p.,http://dx.doi.org/10.3133/pp1810.
Senior author Dr. Charles Bacon is a Senior Research Geologist Emeritus with the U.S. Geological Survey, Volcano Science Center, in Menlo Park, California.