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ARCHIVED REPORT
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ALASKA VOLCANOES UPDATE

Friday, January 2, 1998 11:00 AM

AST (2000 UTC)

Volcano Lat. - Long. Elevation

Chiginagak 57.13N 157.00W

7005 ft (2135 m)

Poor weather conditions obscured

visual observations of the volcano

during this past week. No thermal

anomalies were visible on satellite

imagery during clear periods.

Chiginagak Volcano is not

monitored by seismic instrumentation.

However, AVO is in contact

with USFWS staff who frequently

overfly the area and with citizens

of Pilot Point who have a view of

the volcano during clear weather. Beginning on October 22, AVO

received multiple reports of

increased steaming, snowmelt,

and sulfur smell at Chiginagak

Volcano, a 7005-ft-tall (2135 m)

snow- and ice-covered symmetric

stratovolcano. It is located 110

miles (175 km) south of King

Salmon and 37 miles (60 km)

southeast of Pilot Point on the

Alaska Peninsula. Robust steam

plumes have issued from an

active fumarole at an elevation of

about 5500 feet (1676 m) on the

north flank of the volcano since at

least 1943 and sulfur deposition in

the vicinity of the fumarole

discolors the adjacent snow and

ice. Reports of historic activity at

Chiginagak are poorly documented.

Prehistoric domes, young

pyroclastic deposits and lava

flows occur on the volcano’s

flanks.

Other Volcanoes:

Seismic activity is monitored in real

time at 16 volcanoes in Alaska.

Some of these volcanoes may

currently display anomalous

seismicity, but they are not

considered to be at a dangerous

level of unrest.

Spurr, Redoubt, Iliamna, Augustine,

Griggs, Katmai, Novarupta,

Trident, Mageik, Martin, Pavlof,

Dutton, Akutan, Shishaldin,

Aniakchak and Makushin volcanoes

are all at or near normal

levels of background seismicity.

ABBREVIATED COLOR CODE KEY

(contact AVO for complete

description)

GREEN volcano is dormant;

normal seismicity and

fumarolic activity occurring

YELLOW olcano is restless; eruption

may occur

ORANGE volcano is in eruption or

eruption may occur at any

time

RED significant eruption is

occurring or explosive

eruption expected at any

time

Volcano Information on the Internet:

Http://www.avo.alaska.edu

Recording of the Status of Alaska’s

Volcanoes (907) 786-7478

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].

PDF version of these definitions
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URL: avo.alaska.edu/activity/avoreport_archives.php
Page modified: May 27, 2014 10:23
Contact Information: AVO Web Team

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