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NEWS ITEMS
2022
Mt. Edgecumbe gets a new monitoring station Mount Edgecumbe volcanic field changes from "dormant" to "active" -- what does that mean? Mount Edgecumbe Information Statement, April 22, 2022

2021
Meet the Atka Volcanic Complex Resuspended ash from Aniakchak: August 2, 2021 Information Statement 90th Anniversary of the 1931 eruption of Aniakchak Volcano, Alaska Booming sounds from Veniaminof and their source AVO assists in multi-agency effort to monitor the Barry Arm Landslide in Prince William Sound AVO's 2020 Field Season

2020
Alaska Volcano Observatory Expands Eruption Detection Capability in Cook Inlet The Alaska Volcano Observatory’s summer 2020 field work plans Update on AVO Operations during COVID-19

2019
AVO announces extensive upgrades to volcano monitoring equipment during summer 2019 fieldwork New publication: Alaska Volcano Observatory geochemical database, version 2 New publication: On the eruption age and provenance of the Old Crow tephra New publication: Historically active volcanoes of Alaska v. 3

2018
In the event of a federal government shutdown Tectonic earthquakes and Alaska volcanoes Volcanic Threat Assessment helps prioritize risk reduction efforts at U.S. volcanoes AVO hiring a software engineer at University of Alaska Fairbanks Geophysical Institute Happy 30th Birthday, AVO! New publication: Postglacial eruptive history and geochemistry of Semisopochnoi volcano, western Aleutian Islands, Alaska New publication: Geochemistry of some Quaternary lavas from the Aleutian Arc and Mt. Wrangell New publication: Geologic map of Chiginagak volcano New publication: Major-element glass compositions of tephra from the circa 3.6 ka eruption of Aniakchak volcano, Alaska Peninsula, Alaska New publication: The 2014 eruptions of Pavlof Volcano, Alaska New publication: Historically active volcanoes of Alaska reference deck, v.2

2017
Bogoslof Volcano, Alaska: ongoing eruption through the Bering Sea Thank you Unalaska! Bogoslof Summary of Current Activity Bogoslof Summary of Current Activity, through 19 January 2017

2016
AVO studies resuspended volcanic ash from the Katmai region to Kodiak Island, Alaska Citizen Science - Volcanic Ash Collection Workshop and Public Talk, Kodiak January 30, 2016 Fieldwork at Iliamna and Spurr New publication highlights the importance of ash scrubbing in the evaluation of hazards from explosive eruptions

2015
Critical Volcano Monitoring Systems Returned to Operation in Alaska Resuspended Volcanic Ash from the Katmai Region to Kodiak Island Remobilized Katmai 1912 ash: community events and health hazard analysis Makushin 2015 Geology Blog Sixth Anniversary of the Redoubt 2009 Eruption Happy Anniversary, Shishaldin 1967 and 2014!

2014
New Publication on Aniakchak Volcano Available Online 25th Anniversary of the 1989-90 Eruption of Redoubt Volcano AVO geochemical database now available AVO Scientists Discuss Cook Inlet Volcanoes on Frontier Scientists TV Series Announcing new monitoring equipment for Cleveland volcano 22nd anniversary of Crater Peak (Mt Spurr) June 27 eruption Revised Alaska Interagency Operating Plan for Volcanic Ash Episodes Anniversary of Aniakchak 1931 eruption! April 19th - anniversary of Shishaldin 1999 and Pavlof 1986! Ground-coupled airwaves and explosion signals at Shishaldin 5th anniversary of the Redoubt 2009 eruption Loss of Critical Volcano Monitoring Information in Alaska NEW VOLCANO NUMBERING SYSTEM IMPLEMENTED Loss of Critical Volcano Monitoring Information in Alaska Report released: Geochemical investigations of the hydrothermal system on Akutan Island, July 2012

2013
24th Anniversary of the 1989-90 eruption of Redoubt Volcano Veterans Day slideshow Call for images from active and retired service members! AVO operations during lapse of federal government appropriations New Tool for Reporting Alaska Volcanic Ash Fall Allows Residents to Assist Scientific Monitoring 25 years monitoring Alaska volcanoes - press release

2012
AVO slideshow for Veterans Day Large ash eruptions: when volcanoes reshape valleys -- free public lecture Father Hubbard and the history of exploration in the Valley of Ten Thousand Smokes - free lecture Remote sensing and volcanoes - free public lecture The Great Eruption of 1912 - free public lecture Infrasound Detection of Volcanic Explosions Archaeology of Katmai area and the impact of past eruptions - free public lecture Historical Photography of the Great 1912 Eruption - free public lecture Catastrophic Eruptions and People -- free public lecture Eruption of an Island Volcano: Kasatochi, 2008 -- free public lecture Exploring the Plumbing System of Katmai Volcanoes Exploration of Katmai and the Valley of Ten Thousand Smokes - free public lecture Commemorative presentation in Kodiak: Be Prepared! Earthquakes Below Alaskan Volcanoes - free public lecture DisaStory - A Day of Oral History 1912 Katmai Eruption Children's Program Monitoring Alaska's Volcanoes - free public lecture Landmark volcano study: Katmai Centennial Perspectives free download Special activities on AVO's website for 1912 centennial Alaska Park Science - Volcanoes of Katmai and the Alaska Peninsula AVO at the Alaska Aviation Trade Show and Conference May 5-6 The Great Katmai Eruption of 1912 - a free lecture in Anchorage: April 24, 2012 The Great Katmai Eruption of 1912: A Century of Research Tracks Progress in Volcano Science April 25 -- The Novarupta - Katmai 1912 eruption: a free lecture in Fairbanks by Judy Fierstein Summer lecture series on Alaskan volcanism Poster contest celebrates anniversary of Katmai eruption! Mark your calendar: April 24 public lecture on the great Novarupta-Katmai eruption of 1912 An important volcanic anniversary in Alaska! PUBLISHED: The 2009 Eruption of Redoubt Volcano, Alaska

2011
2011 Alaska Interagency Operating Plan for Volcanic Ash Episodes now available How does Cleveland's lava dome compare to Redoubt's 2009 lava dome? Alaska Volcanoes Guidebook for Teachers

2010
New Fact Sheet on Kasatochi How big is the 2009 Redoubt lava dome?

2009
New map: Historically active volcanoes of Alaska Steaming at Augustine Sarychev Volcano: Active Volcanoes of the Kurile Islands Footage of Alaska's Redoubt Volcano taken on Monday, March 23, 2009. Pre-eruption footage of Redoubt Volcano, Saturday, March 20, 2009 Redoubt Volcano B-Roll Footage

2008
Kasatochi 2008 eruption summary 6th Biennial Workshop on Subduction Processes emphasizing the Kurile-Kamchatka-Aleutian Arcs Geophysical Institute, University of Alaska, Fairbanks, Alaska Chiginagak volcano's acid crater-lake continues to supply acidic, metal-laden water to salmon spawning habitat on the Alaska Peninsula ALASKA VOLCANOES - TEACHER ACTIVITY GUIDEBOOK & KIT 20 years of AVO Viewing earthquake information for Alaska volcanoes

2007
Pavlof webcam added Activity at Pavlof volcano Pavlof thermal anomaly AVO Scientists present at U.S. Department of Education Teacher-to-Teacher Workshop Cleveland webcam available Activity at Cleveland volcano Cleveland satellite images Sheveluch Eruption U.S. Geological Survey's alert notification system for volcanic activity KVERT Volcanic Warnings Ceased

2006
New alert system for volcanic activity Three new webcams added AGU presentations requested New webcam available
MOUNT EDGECUMBE INFORMATION STATEMENT, APRIL 22, 2022
Mount Edgecumbe Information Statement, April 22, 2022
Posted: April 22, 2022
Current observations
A swarm of earthquakes was detected in the vicinity of Mount Edgecumbe volcano beginning on Monday, April 11, 2022. There were hundreds of small quakes in the swarm, though the large majority were too small to locate. Over the past few days, earthquake activity has declined and is currently at background levels. Information can be found anytime on the Edgecumbe page HERE.

The recent swarm inspired an in-depth analysis of the last 7.5 years of ground deformation detectable with radar satellite data. Analysis of these data from recent years reveals a broad area, about 17 km (10.5 miles) in diameter, of surface uplift centered about 2.5 km (1.5 miles) to the east of Mt Edgecumbe. This uplift began in August 2018 and has been continuing to the present at a rate of up to 8.7 cm/yr (3.4 in/yr) in the center of the deforming area. Deformation has been constant since 2018, and there has not been an increase with the recent earthquake activity. The total deformation since 2018 is about 27 cm (10.6 inches).


Main map: Kruzof Island with Mount Edgecumbe and Crater Ridge labeled. Cumulative displacement measured in the line of sight (LOS) of Sentinel 1 radar satellites from Nov 2014-Dec 2021 (positive LOS displacement means uplift and horizontal motion toward the satellite). All deformation is given with observations at the reference pixel removed (chosen away from volcano to only capture tectonic and glacial isostatic adjustment / uplift), resulting in predominantly volcanic motion shown. Red indicates up to 27 cm of inflation. Timeseries insets show deformation over time at locations numbered 1-4 on the main map. Vertical line shows onset of inflation in Aug 2018. We observe linear inflation of up to 8.7 cm/yr since then. Figure by Yitian Cheng and Ronni Grapenthin, AVO/UAFGI



Retrospective analysis of earthquake data in the area of Mount Edgecumbe shows that a small number of earthquakes started occurring under the volcano in 2020. The recent earthquake activity that started on April 11 was unusual in having a greater number of events, however. The earthquakes detected under the volcano since 2020 are all M3.0 or smaller. Note that only the largest of the earthquakes can be located by regional seismic networks; hundreds of very small additional events have been detected, but not located. A map showing earthquake locations in the area, including those occurring on regional faults, can be found here:



Map showing earthquake epicenters near Sitka Alaska from 1990 through 2022 using data products generated by the Alaska Earthquake Center and obtained via the ANSS Combined Catalog. Epicenters before 2010 are shown as black circles and from 2010 to the present are color coded by date (see legend for timeline). Inset shows epicenters at Kruzof Island for the same time period. Lower panel in inset shows earthquake focal depth versus time from 2010 to the present with blue symbols for from 2020 through 2021 and red symbols for 2021 to the present. Figure by Ronni Grapenthin, AVO/UAFGI


There have been no visual changes, surface temperature changes, or gas emissions observed.

Prognosis

The coincidence of earthquakes and ground deformation in time and location suggests that these signals are likely due to the movement of magma beneath Mount Edgecumbe, as opposed to tectonic activity. Initial modeling of the deformation signal shows that it is consistent with an intrusion of new material (magma) at about 5 km (3.1 miles) below sea level. The earthquakes likely are caused by stresses in the crust due to this intrusion and the substantial uplift that it is causing.

Intrusions of new magma under volcanoes do not always result in volcanic eruptions. The deformation and earthquake activity at Edgecumbe may cease with no eruption occurring. If the magma rises closer to the surface, this would lead to changes in the deformation pattern and an increase in earthquake activity. Therefore, it is very likely that if an eruption were to occur it would be preceded by additional signals that would allow advance warning.

Current monitoring

There is no local volcano monitoring network at Edgecumbe. The closest seismic station is in Sitka, 24 km (15 miles) to the east of the volcano and is operated by the National Tsunami Warning Center. Updated satellite radar observations become available on weekly timescales.

AVO has begun plans to add to current monitoring capabilities, possibly by adding instruments closer to the volcano. In the meantime, we are monitoring Edgecumbe using existing regional seismic stations and satellite data.

Background

Mount Edgecumbe is a 976 m (3202 ft) high stratovolcano on Kruzof Island located 24 km (15 mi) west of Sitka, Alaska, and is part of a broader volcanic field of lava domes and craters on southern Kruzof Island and surrounding submarine vicinity. There are no written observations of eruptions from the volcanic field; Tlingit oral history describes small eruptions from about 800 years ago. Geologic investigations show that eruptions 13,000 to 14,500 years ago produced at least one widespread regional tephra (ash) layer around 1 m thick near Sitka and over 30 m thick on parts of Kruzof Island. Smaller eruptions occurred between 6,000 and 4,000 years ago. The volcanic field has erupted a wide range of basalt to rhyolite compositions from numerous vents over the past 600,000 years. The primary hazards of past eruptions, and thus likely in future eruptions, have been volcanic ash emissions producing local and region ashfall and drifting ash clouds. Volcanic lahars (sediment-rich debris flows), pyroclastic flows (hot rock avalanches), and lava flows have also occurred on the flanks of Mount Edgecumbe. Mount Edgecumbe and the surrounding volcanic field lies within the Tongass National Forest.
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