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

VOLCANO ACTIVITY NOTIFICATIONS

2016
November (29 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 WEEKLY UPDATE
U.S. Geological Survey
Friday, August 7, 2015, 2:02 PM AKDT (Friday, August 7, 2015, 22:02 UTC)


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

Low-level unrest continues at Cleveland. Slightly elevated surface temperatures at the summit of the volcano were observed occasionally in satellite data over the past week. Occasional clear web camera views of the volcano showed only a small steam plume at the summit. On Tuesday, August 4 a field crew working in the area reported that a small amount of lava covered the crater floor. The surface temperatures of the solidified lava measured by the field crew were in the range of 550-600 Celsius (1000-1100 Fahrenheit), which is consistent with cooling lava. Minor ash and gas emissions also were observed. A small explosion occurred on Thursday, August 6 at 22:03 AKDT (08/07/15 06:03 UTC). No ash cloud was observed from this explosion, in satellite or web camera images or by observers. Observations of diffuse ash emissions and small explosions indicate that eruptive activity is still occurring. Further explosions could occur without warning.

Cleveland volcano forms the western portion of Chuginadak Island, a remote and uninhabited island in the east central Aleutians. The volcano is located about 75 km (45 mi) west of the community of Nikolski, and 1500 km (940 mi) southwest of Anchorage. The most recent significant period of eruption began in February, 2001 and produced 3 explosive events that generated ash clouds as high as 39,000 ft above sea level. The 2001 eruption also produced a lava flow and hot avalanche that reached the sea. Since then, Cleveland has been intermittently active producing small lava flows, often followed by explosions that generate small ash clouds generally below 20,000 ft above sea level. These explosions also launch debris onto the slopes of the cone producing hot pyroclastic avalanches and lahars that sometimes reach the coastline.

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

Low-level eruptive activity within the summit crater has continued over the past week. The level of seismicity detected remains above background and has changed little over the past week. Elevated surface temperatures at the summit were observed occasionally in satellite data over the past week, and a persistent steam/gas plume has been evident in occasional clear web camera images.

Shishaldin volcano, located near the center of Unimak Island in the eastern Aleutian Islands, is a spectacular symmetric cone with a base diameter of approximately 16 km (10 mi). A 200-m-wide (660 ft) funnel-shaped summit crater typically emits a steam plume and occasional small amounts of ash. Shishaldin is one of the most active volcanoes in the Aleutian volcanic arc, with at least 54 episodes of unrest including over 24 confirmed eruptions since 1775. Most eruptions are relatively small, although the April-May 1999 event generated an ash column that reached 45,000 ft above sea level.

OTHER ALASKA VOLCANOES

Other Alaska volcanoes show no signs of significant unrest: http://www.avo.alaska.edu/activity/

AVO scientists conduct daily checks of earthquake activity at all seismically-monitored volcanoes, examine web camera and satellite images for evidence of airborne ash and elevated surface temperatures, and consult other monitoring data as needed.

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

FOR MORE INFORMATION ON ALASKA VOLCANOES: http://www.avo.alaska.edu

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:

John Power, Scientist-in-Charge, USGS
jpower@usgs.gov (907) 786-7497

Jeff Freymueller, Coordinating Scientist, UAFGI
jeff.freymueller@gi.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: www2.avo.alaska.edu/activity/avoreport.php
Page modified: June 21, 2016 14:47
Contact Information: AVO Web Team

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