The 2009 eruption of Redoubt Volcano continues. A lava dome is currently growing in the summit crater, accompanied by intermittent emissions of volcanic
gases and minor amounts of ash. Additional explosive events are likely and could send ash to greater than 30,000 feet above sea level. Such a cycle of dome
growth and explosive dome destruction may continue for many months. The potential for lahars (volcanic mudflows) and other flooding down the Drift River Valley
remains, as does the potential for trace to minor ash fall on communities near Redoubt (e.g., the Kenai Peninsula Borough, The Municipality of Anchorage,
and the Matanuska-Susitna Borough, and possibly more distant areas).
The 2009 eruption of Redoubt Volcano began with a minor explosion of steam and ash just after 13:00 AKDT on March 15. Major explosive events began at
approximately 22:40 March 22 AKDT, and since then AVO has recorded more than 19 separate explosions. Plume heights, as measured by radar and confirmed
by pilot reports, have exceeded 50,000 feet (15 km) above sea level on multiple occasions. To date, the largest explosion occurred at 05:55 AKDT April 4,
lasted more than 30 minutes, and is comparable in size to the largest event of the 1989/1990 Redoubt eruption.
Three major lahars (volcanic mudflows), on March 23, March 26, and April 4, have inundated the Drift River Valley and its downstream coastal fan. All of
these reached the Cook Inlet and affected the Drift River Oil Terminal (DROT). The peak discharge rates of these lahars remains under investigation, but
all are considered significant, and the April 4 event may have exceeded the size of any lahar observed during the 1989/1990 eruption. Smaller lahars that
did not impact DROT have also occurred.
Several of Redoubt's recent explosions have resulted in measurable ash fall over populated areas as distant as Delta Junction (340 miles northeast of
Redoubt), with more significant ash fall in more proximate areas, including the Susitna Valley, the Kenai Peninsula and the Anchorage bowl. On the
afternoon of March 28, ash fall in Anchorage closed the airport from 17:00 until 07:00 the next morning (March 29). The maximum ash fall measured so
far in a populated area is about 1/16th of an inch (1.5 mm) near Seldovia following the April 4 explosion. A measurement of about 1/8th of an inch (3 mm)
following the explosion on March 26, was recorded near Silver Salmon Creek Lodge, about 30 miles (48 km) south of the volcano. Trace ash fall has also been
observed between explosive events during times when the volcano is emitting a continuous low altitude (< 15,000 feet ASL) gas and ash plume.
A rich variety of seismic signals have been recorded at Redoubt throughout the eruption and in the preceding months of unrest. These seismic events include:
More than 1700 earthquakes have been located since mid-January, and many more occurred that were either too small or of such a character as to make location
impossible. Typically, the magnitudes of these events are small, the average being around M0.5. However, on April 9 a magnitude ML 3.3 earthquake occurred
about 2.5 miles (4 km) E/NE of Redoubt's summit, possibly resulting from a crustal adjustment to the ongoing withdrawal from Redoubt's subterranean magma
Since the fall of 2008, AVO has flown 13 gas measurement flights, and of these, 5 have occurred since the eruption began on March 15, 2009. Elevated carbon
dioxide (CO2) emission rates (up to 2000 tonnes/day) were measured in October-November, 2008. Starting in late January 2009, and coincident with a strong
increase in seismicity, gas emission rates rose to a level (> 5000 tonnes/d) suggesting significant unrest at the volcano, and emissions stayed at this level
until the eruption began. Since that time, emissions of both CO2 and sulfur dioxide (SO2) have been very elevated, sometimes reaching levels in excess of
10,000 tonnes/d. These volcanic gas emission rates are among the largest ever measured in Alaska, though such high values are consistent with an openly
degassing volcanic system that is actively extruding lava. Based on measurements and observations from Redoubt's previously observed eruptions, these gas
emission rates are likely to drop substantially when the eruption wanes.
The combination of gas and ash emission from Redoubt since the beginning of the eruption has on occasion resulted in a brownish-yellow volcanic haze in the
Cook Inlet region. The volcanic haze contains small quantities of ash, water vapor, sulfur aerosols, and liquid droplets suspended in the air. The main
concerns for human health in volcanic haze consist of ash, sulfur dioxide gas (SO2), and sulfuric acid droplets (H2SO4), which forms when volcanic SO2
oxidizes in the atmosphere. Volcanic haze can be both an eye and respiratory irritant. The State of Alaska Epidemiology Bulletin No. 5 summarizes the health
effects associated with volcanic emissions and is available on the web at:
Visual and satellite observations show that by March 27, a deep crater about ½ mile (800 m) across formed in the middle of the summit amphitheater, likely
from one or more of the explosions during the early stage of the eruption. By April 4, a north/south elongated lava dome, about ½ mile (800 m) long had grown
out of the new crater, at an elevation of around 8000 feet (2400 m) above sea level. Most if not all of this dome was destroyed during the large explosion of
April 4. A large amount of ice and snow has been removed from the upper Drift Glacier. The Drift River Valley has also been mostly denuded of snow and is
covered with lahar deposits. The latest observations, as of about April 9, show a growing lava dome in about the same place as the previous dome. This new
dome is about ¼ mile (400 meters) in diameter, and roughly circular as viewed from above.
Prognosis and Ongoing Hazards
- typical "rock-breaking" earthquakes;
- volcanic "tremor", indicative of steam and other volcanic gases or fluids vigorously propagating through cracks;
- large, far-reaching, "cigar-shaped" signals resulting from volcanic explosions;
- ground shaking from lahars as they pass nearby seismometers; and
- small, repetitive, self-similar events associated with the slow extrusion of lava (this kind of extrusion is often referred to as "dome building").
The 2009 Redoubt eruption began with a series of large explosions on March 22-23, followed by less-energetic dome growth in the summit crater. On April 4
another large explosion occurred, which was in turn followed by growth of the current dome. There will likely be additional explosive events during the
coming days to months, but their exact nature, as well as timing, remains uncertain. Because the dome sits at the lip of a steep slope leading out of the
crater it can become unstable, and (as in 1990) collapse into the Drift River valley, producing avalanches of hot lava blocks, pyroclastic flows, lahars,
and ash columns tens of thousands of feet tall, which can carry ash to Alaska communities. During periods between explosions, residents and pilots may also
notice occasional sulfur smell and hazy conditions due to low-level ash and volcanic gas emissions
Status of Instrumentation and Observation
Monitoring capabilities at Redoubt remain strong. The real-time network consists of 7 seismometers, a pressure sensor, and 2 web cameras. There are 4
additional seismometers, 3 additional GPS receivers, and 1 time-lapse camera that record and store data on site. Two seismometers and a continuous Global
Positioning System (GPS) receiver were damaged by lightning discharge during the March 23 explosion and are not currently operational. Repair of the damaged
real-time instruments and collection of data from instruments with on-site recording will occur as weather and safety conditions permit.
Redoubt is also monitored by satellite. Observation flights for airborne gas measurements, targeted thermal imaging, geologic analysis, and sampling of
eruption deposits are also made, again, as weather and eruption conditions permit. The Alaska Volcano Observatory is staffed 24/7 and will remain as such so
long as conditions warrant.