Little Sitkin

Country: United States
Volcanic Region Group: North America Volcanic Regions
Volcanic Region: Aleutian Ridge Volcanic Arc
Volcano Landform: Composite
Primary Volcano Type: Stratovolcano
Activity Evidence: Eruption Observed
Last Known Eruption: 1830 CE
Latitude: 51.95
Longitude: 178.543
Elevation (meters): 1174
Tectonic Setting: Subduction zone / Intermediate crust (15-25 km)
Dominant Rock Type: Andesite / Basaltic Andesite
Last Updated: 2022-07-14 22:40:33

Current Ash Alerts

Title: No Ash Alerts
Description: No Ash Alerts
Link: #
Guid: #
No general news available

Current Alert Status

Alert Level: NORMAL
Color Code: GREEN
Cap Certainty: NULL
Cap Severity: NULL
Cap Urgency: NULL
Is Elevated Cap:
Prev Elevated Cap:
Notice Identifier: DOI-USGS-AVO-2022-07-14T12:59:15-08:00
Pub Date: 2022-07-14 22:40:33
Sent Date Cap: 2022-07-14 22:40:33
Cap Expires: 2022-07-14 22:40:33
Mail Subject: Alaska Volcano Observatory: Little Sitkin
Author: Alaska Volcano Observatory
Synopsis: Archived
Guid: https://volcanoes.usgs.gov/hans-public/notice/DOI-USGS-AVO-2022-07-14T12:59:15-08:00
Prev Guid: NULL
Msg Type: Archived
Notice Type Cd: IS
Notice URL: https://volcanoes.usgs.gov/hans-public/notice/DOI-USGS-AVO-2022-07-14T12:59:15-08:00
Prev Notice URL: NULL
Notice Data: https://volcanoes.usgs.gov/hans-public/api/notice/getNotice/DOI-USGS-AVO-2022-07-14T12:59:15-08:00
Highest Alert Level: ADVISORY
Highest Color Code: YELLOW
Volcano Cds CSV: ak182,ak248

Notice Sections:

lat: 51.9531
lng: 178.5356
vnum: 311050
vName: Little Sitkin
region: Aleutians
vImage:
summary:

The Avation Color Code and Alert Level changed from UNASSIGNED to GREEN/NORMAL due to an upgraded communication link to instrumental monitoring data. 

Little Sitkin is monitored by local seismic and infrasound sensors, satellite data, web cameras, and remote infrasound and lightning networks.

synopsis: AVO Little Sitkin GREEN/NORMAL - Aviation Color Code and Alert Level changed to GREEN/NORMAL due to upgraded communications link
colorCode: GREEN
sectionId: DOI-USGS-AVO-2022-07-14T12:59:45-08:00
alertLevel: NORMAL
sectionHtml:

ALASKA VOLCANO OBSERVATORY INFORMATION STATEMENT
U.S. Geological Survey
Thursday, July 14, 2022, 2:40 PM AKDT (Thursday, July 14, 2022, 22:40 UTC)


Upgrades to a satellite telemetry link have improved transmission of local monitoring data from the Little Sitkin and Semisopochnoi volcano networks. After an extended evaluation period following the 2021 field season, the Alaska Volcano Observatory (AVO) now considers the telemetry link sufficiently reliable to confidently monitor seismic unrest at these volcanoes. With the establishment of robust data transmission, Little Sitkin volcano is being moved from UNASSIGNED to a Volcano Alert Level of NORMAL and an Aviation Color Code of GREEN. Semisopochnoi volcano remains in an elevated state of unrest with a Volcano Alert Level of ADVISORY and Aviation Color Code YELLOW.



LITTLE SITKIN (VNUM #311050)
51°57'11" N 178°32'8" E, Summit Elevation 3898 ft (1188 m)
Current Volcano Alert Level: UNASSIGNED
Current Aviation Color Code: UNASSIGNED

The Avation Color Code and Alert Level changed from UNASSIGNED to GREEN/NORMAL due to an upgraded communication link to instrumental monitoring data. 

Little Sitkin is monitored by local seismic and infrasound sensors, satellite data, web cameras, and remote infrasound and lightning networks.




This notice contains volcanoes not displayed here: Semisopochnoi (ADVISORY/YELLOW).

OTHER ALASKA VOLCANOES

Information on all Alaska volcanoes is available at: http://www.avo.alaska.edu.

For definitions of Aviation Color Codes and Volcano Alert Levels, see: http://www.avo.alaska.edu/color_codes.php

SUBSCRIBE TO VOLCANO ALERT MESSAGES by email: http://volcanoes.usgs.gov/vns/

FOLLOW AVO ON FACEBOOK: https://facebook.com/alaska.avo

FOLLOW AVO ON TWITTER: https://twitter.com/alaska_avo



CONTACT INFORMATION:

Michelle Coombs, Scientist-in-Charge, USGS [email protected] (907) 786-7497

David Fee, Coordinating Scientist, UAFGI [email protected] (907) 322-4085



The Alaska Volcano Observatory is a cooperative program of the U.S. Geological Survey, the University of Alaska Fairbanks Geophysical Institute, and the Alaska Division of Geological and Geophysical Surveys.

lat: 51.9288
lng: 179.5977
vnum: 311060
vName: Semisopochnoi
region: Aleutians
vImage:
summary:

Semisopochnoi remains in a state of unrest with an Aviation Color Code and Alert Level YELLOW/ADVISORY. Upgrades in the communication link to instrumental monitoring data have established more reliable data transmission for improved local monitoring. These changes will enable AVO to designate Semisopochnoi with an Aviation Color Code and Alert Level GREEN/NORMAL rather than UNASSIGNED during future periods of quiescence. 

Semisopochnoi is monitored by local seismic and infrasound sensors, satellite data, web cameras, and remote infrasound and lightning networks.

synopsis: AVO Semisopochnoi YELLOW/ADVISORY - Upgraded communications link improves local monitoring capabilities. Semisopochnoi remains at Aviation Color Code and Alert Level YELLOW/ADVISORY.
colorCode: YELLOW
sectionId: DOI-USGS-AVO-2022-07-14T12:59:52-08:00
alertLevel: ADVISORY
sectionHtml:

ALASKA VOLCANO OBSERVATORY INFORMATION STATEMENT
U.S. Geological Survey
Thursday, July 14, 2022, 2:40 PM AKDT (Thursday, July 14, 2022, 22:40 UTC)


Upgrades to a satellite telemetry link have improved transmission of local monitoring data from the Little Sitkin and Semisopochnoi volcano networks. After an extended evaluation period following the 2021 field season, the Alaska Volcano Observatory (AVO) now considers the telemetry link sufficiently reliable to confidently monitor seismic unrest at these volcanoes. With the establishment of robust data transmission, Little Sitkin volcano is being moved from UNASSIGNED to a Volcano Alert Level of NORMAL and an Aviation Color Code of GREEN. Semisopochnoi volcano remains in an elevated state of unrest with a Volcano Alert Level of ADVISORY and Aviation Color Code YELLOW.



SEMISOPOCHNOI (VNUM #311060)
51°55'44" N 179°35'52" E, Summit Elevation 2625 ft (800 m)
Current Volcano Alert Level: ADVISORY
Current Aviation Color Code: YELLOW

Semisopochnoi remains in a state of unrest with an Aviation Color Code and Alert Level YELLOW/ADVISORY. Upgrades in the communication link to instrumental monitoring data have established more reliable data transmission for improved local monitoring. These changes will enable AVO to designate Semisopochnoi with an Aviation Color Code and Alert Level GREEN/NORMAL rather than UNASSIGNED during future periods of quiescence. 

Semisopochnoi is monitored by local seismic and infrasound sensors, satellite data, web cameras, and remote infrasound and lightning networks.




This notice contains volcanoes not displayed here: Little Sitkin (UNASSIGNED/UNASSIGNED).

OTHER ALASKA VOLCANOES

Information on all Alaska volcanoes is available at: http://www.avo.alaska.edu.

For definitions of Aviation Color Codes and Volcano Alert Levels, see: http://www.avo.alaska.edu/color_codes.php

SUBSCRIBE TO VOLCANO ALERT MESSAGES by email: http://volcanoes.usgs.gov/vns/

FOLLOW AVO ON FACEBOOK: https://facebook.com/alaska.avo

FOLLOW AVO ON TWITTER: https://twitter.com/alaska_avo



CONTACT INFORMATION:

Michelle Coombs, Scientist-in-Charge, USGS [email protected] (907) 786-7497

David Fee, Coordinating Scientist, UAFGI [email protected] (907) 322-4085



The Alaska Volcano Observatory is a cooperative program of the U.S. Geological Survey, the University of Alaska Fairbanks Geophysical Institute, and the Alaska Division of Geological and Geophysical Surveys.

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