AVO Logo
Site Map | FAQ |
Alaska Volcano Observatory
Summary | Color Code Definitions | Webcams | Webicorders | RSAM | Activity Notifications | Notification Search | Great Sitkin | Semisopochnoi 
You are here: Home > Current Volcanic Activity > Activity Notifications

VOLCANO ACTIVITY NOTIFICATIONS

2020
September (21 reports)
August (32 reports)
July (32 reports)
June (38 reports)
May (32 reports)
April (32 reports)
March (35 reports)
February (34 reports)
January (40 reports)
2019
December (35 reports)
November (33 reports)
October (33 reports)
September (35 reports)
August (33 reports)
July (36 reports)
June (33 reports)
May (31 reports)
April (31 reports)
March (31 reports)
February (31 reports)
January (34 reports)
2018
December (34 reports)
November (35 reports)
October (33 reports)
September (34 reports)
August (31 reports)
July (32 reports)
June (33 reports)
May (34 reports)
April (32 reports)
March (35 reports)
February (30 reports)
January (32 reports)
2017
December (34 reports)
November (33 reports)
October (31 reports)
September (33 reports)
August (47 reports)
July (52 reports)
June (59 reports)
May (40 reports)
April (35 reports)
March (39 reports)
February (51 reports)
January (80 reports)
2016
December (52 reports)
November (32 reports)
October (32 reports)
September (30 reports)
August (33 reports)
July (36 reports)
June (33 reports)
May (36 reports)
April (34 reports)
March (36 reports)
February (30 reports)
January (32 reports)
2015
December (34 reports)
November (33 reports)
October (39 reports)
September (36 reports)
August (32 reports)
July (36 reports)
June (32 reports)
May (36 reports)
April (35 reports)
March (34 reports)
February (28 reports)
January (34 reports)
2014
December (32 reports)
November (36 reports)
October (34 reports)
September (33 reports)
August (33 reports)
July (35 reports)
June (39 reports)
May (33 reports)
April (32 reports)
March (32 reports)
February (30 reports)
January (35 reports)
2013
December (33 reports)
November (31 reports)
October (34 reports)
September (32 reports)
August (34 reports)
July (32 reports)
June (36 reports)
May (36 reports)
April (29 reports)
March (35 reports)
February (30 reports)
January (32 reports)
2012
December (30 reports)
November (32 reports)
October (31 reports)
September (31 reports)
August (32 reports)
July (31 reports)
June (32 reports)
May (32 reports)
April (30 reports)
March (35 reports)
February (30 reports)
January (8 reports)
2011
December (27 reports)
November (31 reports)
October (31 reports)
September (30 reports)
August (31 reports)
July (15 reports)
June (4 reports)
May (4 reports)
April (5 reports)
March (31 reports)
February (28 reports)
January (31 reports)
2010
December (31 reports)
November (30 reports)
October (31 reports)
September (30 reports)
August (9 reports)
July (5 reports)
June (14 reports)
May (10 reports)
April (13 reports)
February (4 reports)
January (10 reports)
2009
December (5 reports)
November (1 report)
October (22 reports)
September (31 reports)
August (29 reports)
July (36 reports)
June (33 reports)
May (37 reports)
April (35 reports)
March (58 reports)
February (30 reports)
January (39 reports)
2008
December (32 reports)
November (32 reports)
October (35 reports)
September (32 reports)
August (45 reports)
July (45 reports)
June (30 reports)
May (32 reports)
April (30 reports)
March (5 reports)

Older reports can be found here.

Report Text
Printer friendly version


ALASKA VOLCANO OBSERVATORY DAILY UPDATE
U.S. Geological Survey
Saturday, July 13, 2019, 12:39 PM AKDT (Saturday, July 13, 2019, 20:39 UTC)


SHISHALDIN VOLCANO (VNUM #311360)
54°45'19" N 163°58'16" W, Summit Elevation 9373 ft (2857 m)
Current Volcano Alert Level: ADVISORY
Current Aviation Color Code: YELLOW

Seismic tremor has continued over the last 24 hours. No eruptive activity was detected in infrasound data and cloudy conditions obscured satellite views of the volcano.

The Aviation Color Code and Volcano Alert Level were increased to YELLOW/ADVISORY at Shishaldin Volcano on Friday, July 12, 2019, based on increased seismic activity over the previous few weeks and elevated surface temperatures at the summit in satellite data. Incandescence was observed in the summit crater during a recent overflight. These observations represent a departure from normal background activity at Shishaldin, but do not necessarily indicate that an eruption will occur.

Shishaldin is monitored by local seismic and infrasound sensors, satellite data, a web camera, a telemetered geodetic network, and distant infrasound and lightning networks.


SEMISOPOCHNOI VOLCANO (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

Seismic tremor has been continuous over the last 24 hours. No eruptive activity was detected in regional infrasound data and cloudy conditions obscured satellite views of the volcano.

Semisopochnoi is monitored with an on-island seismic network and remotely by satellite and lightning sensors. Furthermore, an infrasound array on Adak Island may detect explosive emissions from Semisopochnoi with a 13 minute delay if atmospheric conditions permit.


CLEVELAND VOLCANO (VNUM #311240)
52°49'20" N 169°56'42" W, Summit Elevation 5676 ft (1730 m)
Current Volcano Alert Level: ADVISORY
Current Aviation Color Code: YELLOW

Satellite views of the volcano were cloudy over the last 24 hours, but an elevated surface temperature was visible in one image with a view of the volcano's summit. No activity was detected in regional seismic or infrasound data.

Additional episodes of lava effusion and explosions are likely and will occur without advance warning. Explosions from Cleveland are normally short duration and only present a hazard to aviation in the immediate vicinity of the volcano. Larger explosions that present a more widespread hazard to aviation are possible, but are less likely and occur less frequently.

Local seismic and infrasound data at Cleveland have been unavailable since January 26, 2019. This restricts AVO's ability to rapidly detect an explosive eruption. AVO is able to monitor the volcano for signs of eruptive activity with satellite, lightning, and regional seismic and infrasound data.


GREAT SITKIN VOLCANO (VNUM #311120)
52°4'35" N 176°6'39" W, Summit Elevation 5709 ft (1740 m)
Current Volcano Alert Level: ADVISORY
Current Aviation Color Code: YELLOW

Nothing significant was observed in cloudy satellite views of the volcano over the last 24 hours. Seismicity is near or at background levels. Nothing noteworthy was detected in regional infrasound data.

Great Sitkin volcano is monitored with a local real-time seismic network, which will typically allow AVO to detect changes in unrest that may lead to an explosive eruption. Rapid detection of an ash-producing eruption would be accomplished using a combination of seismic, infrasound, lightning, and satellite data.


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
mcoombs@usgs.gov (907) 786-7497

David Fee, Coordinating Scientist, UAFGI
dfee1@alaska.edu (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.
VOLCANO ALERT LEVELS
NORMAL
Volcano is in typical background, noneruptive state or, after a change from a higher level, volcanic activity has ceased and volcano has returned to noneruptive background state.
ADVISORY
Volcano is exhibiting signs of elevated unrest above known background level or, after a change from a higher level, volcanic activity has decreased significantly but continues to be closely monitored for possible renewed increase.
WATCH
Volcano is exhibiting heightened or escalating unrest with increased potential of eruption, timeframe uncertain, OR eruption is underway but poses limited hazards.
WARNING
Hazardous eruption is imminent, underway, or suspected.
AVIATION COLOR CODES
GREEN
Volcano is in typical background, noneruptive state or, after a change from a higher level, volcanic activity has ceased and volcano has returned to noneruptive background state.
YELLOW
Volcano is exhibiting signs of elevated unrest above known background level or, after a change from a higher level, volcanic activity has decreased significantly but continues to be closely monitored for possible renewed increase.
ORANGE
Volcano is exhibiting heightened or escalating unrest with increased potential of eruption, timeframe uncertain, OR eruption is underway with no or minor volcanic-ash emissions [ash-plume height specified, if possible].
RED
Eruption is imminent with significant emission of volcanic ash into the atmosphere likely OR eruption is underway or suspected with significant emission of volcanic ash into the atmosphere [ash-plume height specified, if possible].
Contact AVO Privacy Accessibility Information Quality FOIA
URL: www.avo.alaska.edu/activity/avoreport.php
Page modified: February 17, 2017 10:11
Contact Information: AVO Web Team

twitter @alaska_avo
facebook alaska.avo
email Receive volcano updates by email: USGS VNS

This website is supported by the U.S. Geological Survey under Cooperative Agreement Grant G19AC00060 and G19AC00171.

Mention of trade names or commercial products does not constitute their endorsement by the U.S. Geological Survey.