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Posted by feww on November 22, 2018
KMPH – 112202
Earthquake details:
M 5.7 – 65km SSW of Redoubt Volcano, Alaska
Location: 59.973°N, 153.308°W
Depth: 145.5 km
Time: 2018-11-21 18:21:43 (UTC)
Detailed FIRE-EARTH Forecast for the region, including nearby seismicity and volcanism, available via FIRE-EARTH PULSARS.
Posted in News Alert | Tagged: Alaska, earhquake forecast, earthquake, M5.7, Mount Iliamna, Redoubt Volcano, Seismicity | Leave a Comment »
Posted by feww on August 5, 2015
The quake was one of a swarm of at least 18 earthquakes measuring ≥ 2.5Mw to strike the Puerto Rico Trench in the past 24 hours.
Magnitude: 4.5Mw
Location: 19.521°N, 66.366°W (90km N of Brenas, Puerto Rico), depth=72.0 km
Date – Time:2015-08-05 at 07:29:59 UTC
M 5.7 earthquake strikes near Tonala, Mexico
Location: 16.163°N, 93.621°W; depth=109.9 km
Time: 2015-08-05 09:13:24 UTC
M 3.8 – 64km SW of Redoubt Volcano, Alaska
Location: 60.090°N 153.303°W
Depth: 130.2 km
Time: 2015-08-05 10:06:30 UTC
M4.1 – 68km SSW of Nikolski, Alaska
Location: 52.338°N 169.067°W
Depth: 35.0 k
Time: 2015-08-05 09:30:03 UTC
M 4.6 – 145km WNW of Tobelo, Indonesia
Location: 2.333°N 126.847°E
Depth: 51.0 km
Time: 2015-08-05 00:16:26 UTC
M 3.8 – 64km SW of Redoubt Volcano, Alaska
Location: 60.090°N, 153.303°W
Depth : 30.2 km
Time: 2015-08-05 10:06:30 UTC
M3.9 – 33km N of Anchor Point, Alaska
Location: 60.124°N 151.785°W
Depth: 56.2 km
Time: 2015-08-05 07:38:22UTC
[Source: USGS/EHP]
Posted in Earthquake Information, earthquake report | Tagged: Alaska, Brenas, earthquake, Mexico, Nikolski, Puerto Rico, Puerto Rico Trench, Redoubt Volcano, Tonala | Leave a Comment »
Posted by feww on July 29, 2015
Magnitude: 6.3Mw [USGS/EHP]
Location: 59.906°N, 153.150°W
Depth: 116.6 km
Time: 2015-07-29 at 02:35:59 UTC,
Distances:
M4.7 quake strikes 73km SSW of Nikolski, Alaska
Location: 52.361°N 169.387°W; depth=35.2km
Time:2015-07-29 07:41:07UTC
M4.9 quake strikes 10km W of Merizo Village, Guam
Location: 13.262°N 144.576°E; depth=89.7km
Time: 2015-07-29 03:51:07UTC
M5.9 quake strikes 29km S of Acandi, Colombia
Location: 8.237°N, 77.298°W; depth=10.0 km
Time: 2015-07-29 00:10:24 UTC
Posted in Earthquake Information, earthquake report, News Alert | Tagged: Alaska, Anchorage, colombia, earthquake, Guam, Nikolski, Redoubt Volcano | Leave a Comment »
Posted by feww on July 1, 2009
After Redoubt’s last explosive eruption about three month ago, the researchers at the Alaska Volcano Observatory say the volcano may be settling down. The aviation alert level has been lowered to code yellow (advisory), however, constant monitoring continues.
Redoubt has been oozing magma and ejecting steam since the last eruption on April 4, 2009.
“The last couple of months at Redoubt, we have been building a mountain,” said one of the researchers, referring to the colossal lava dome.
As of June 9, the giant dome had grown to approximately 67.5 million m3 in volume. the dome is unstable and can collapse at any time, causing explosions, and flooding the Drift River valley.
Redoubt from the east. Picture Date: July 01, 2009. Image Creator: Cyrus Read. Image courtesy of AVO/USGS.
Redoubt photo taken by DFR Webcam. AVO. Camera is co-located with seismic station DFR, approximately 12.2 km NE of Redoubt.
ALASKA VOLCANO OBSERVATORY INFORMATION STATEMENT
Tuesday, June 30, 2009 4:38 PM AKDT (Wednesday, July 1, 2009 0038 UTC)
Redoubt Volcano
60°29’7″ N 152°44’38” W, Summit Elevation 10197 ft (3,108 m)
Current Volcano Alert Level: ADVISORY
Current Aviation Color Code: YELLOW
Extended Information Statement
The 2009 eruption of Redoubt volcano began March 15th, 2009 with a steam explosion. Between March 22nd and April 4th, Redoubt produced multiple significant explosions that sent ash and gas clouds to as high as 65,000 feet (19.8 km) above sea level. After April 4th, the eruption continued with extrusion of a lava dome within the summit crater, eventually producing a blocky lava flow that currently extends ~0.6 miles (1 km) down the north flank of the volcano. Redoubt entered its 14th week of eruptive activity the week of June 22nd. More …
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Posted in Drift River, lava dome, magma, seismic activity | Tagged: alaska volcano, Redoubt Volcano, volcanic eruption, volcanic unrest | Leave a Comment »
Posted by feww on May 6, 2009
Latest update from AVO:
2009-05-06 04:23:52
Seismic activity remains unchanged over the last 2 hours. Repeating seismic events continue. It is possible that an explosive event could occur at any time with little warning. Weather clouds have dissipated near the volcano. The volcano is once again visible from the Hut netcam, and has occasionally revealed glowing spots related to rockfalls from the growing dome.
Image of Redoubt’s dome and summit area, taken during gas / observation flight on May 4, 2009. Image Creator: Keith Labay ; Image courtesy of AVO/USGS.
View of the north flank of Redoubt Volcano from the research hut where one of the webcams is situated. This zoomed image shows a minor block-and-ash flow advancing down the talus slope below the dome produced from hot debris shed off the dome. Hot debris collects in the gorge above the waterfall generating minor, secondary steam/ash clouds. Picture Date: April 30, 2009 14:14:39 AKDT – Image Creator: Game McGimsey -Image courtesy of AVO/USGS.
View of the growing lava dome during gas and observation flight on May 4, 2009. Note the tongue of blocky lava extending down the upper Drift gorge. A lighter gray slope of talus – rocky debris shed off the slowly advancing tongue of lava – fills the gorge downslope, nearly reaching the muddy waterfall. Small plumes of ash rise from rockfalls. Note the vigorously steaming margins of the dome, possibly caused by interaction of hot rock and water accumulating from melting snow and ice in the summit crater. Colleague Rick Wessels used a shortwave infrared (SWIR) image captured by a nighttime pass of Landsat 7 to show the dimensions of the dome – about 510 x 760 m (1700 feet x 2500 feet) and at least 150 m (500 feet) high. See image below. Picture Date: May 04, 2009 AKDT – Image Creator: Christina Neal – Image courtesy of AVO/USGS.
Shortwave infrared (SWIR) image of the warm dome areas captured by a nighttime pass of Landsat 7 on May 02, 2009. The hot dome pixels have been placed over a WorldView image from April 16, 2009 and a topographic map from 1990. The SWIR image shows a hot central vent as well as areas of active rockfalls along the perimeter.
Picture Date: May 02, 2009 07:12:54 UTC – Image Creator: Rick Wessels – Image montage produced by AVO/USGS. Landsat data courtesy of USGS Earth Resources Observation and Science (EROS). WorldView Data, Digital Globe, Inc (copyright 2009)
Redoubt Volcano active lava dome taken from the north The top image is an oblique airphoto by Game McGimsey while the bottom shows the FLIR thermal image. Picture Date: April 16, 2009 12:48:50 AKDT – Image Creator: Rick Wessels – Image courtesy of AVO/USGS.
Related Links
Posted in Alaska volcanoes, explosive event, lava flow, oil terminal, redoubt ashfall | Tagged: active lava dome, Alaska's redoubt, Explosive Eruption, Redoubt Volcano, seismic events | Leave a Comment »
Posted by feww on March 28, 2009
2009-03-27 21:55:58 AKDT
At 19:25 AKDT March 27, 2009 (3:25 UTC March 28) an explosive eruption occurred at Redoubt volcano. National Weather Service reports an ash cloud height of about 51,000 feet above sea level. This follows closely behind the eruption that occurred at approximately 17:35 AKDT (01:35 UTC) that sent ash to an estimated height of 40,000 feet above sea level.
See the National Weather Service Redoubt Coordination Page for any ash fall advisories: http://pafc.arh.noaa.gov/volcano.php
Photograph of impact from the volcanic ash fall out in Nikiski, AK from Redoubt volcano. This plume was generated during the March 28, 15:29 AKDT, 2009 event, and ash fall began at approximately 16:16 AKDT and lasted maybe 5 minutes. Fine ash is resuspended as vehicles drive over the recently deposited ash fall deposit. Picture Date: March 30, 2009 16:45:00 AKDT. Image Creator: Kristi Wallace. Image courtesy of AVO/USGS.
Photograph of Redoubt’s March 27, 19:25 eruption cloud, as seen from near Homer. Photograph courtesy of Dennis Anderson. Picture Date: March 27, 2009 19:57:00. Image Creator: Dennis Anderson. Image courtesy of Dennis Anderson (via AVO) http://www.auroradude.com
Photograph taken during oberservation / gas collection flight to Redoubt Volcano on March 26, 2009. Image Creator: Tina Neal. Image courtesy of AVO/USGS.
Ash cloud seen in the geostationary MTSAT data, courtesy of the National Weather Service, processed by the Cooperative Institute for Meteorological Satellite Studies at the University of Wisconsin-Madison . We are at the extreme edge of the view for the satellite which is over the equator in Asia. Picture Date: March 26, 2009 17:30:00 UTC. Image Creator: Jonathan Dehn. Image courtesy of the National Weather Service.
Redoubt volcano viewed from the south over the ash-covered Crescent River Valley. Picture Date: March 26, 2009 17:18:45 AKDT. Image Creator: Game McGimsey. Image courtesy of AVO/USGS.
View northeast over the piedmont lobe of the Drift Glacier and down the Drift River valley showing the effects of flooding caused by eruptions of Redoubt volcano earlier in the day. Picture Date: March 26, 2009 17:29:02 AKDT. Image Creator: Game McGimsey. Image courtesy of AVO/USGS.
Photograph taken during observation / gas collection flight to Redoubt Volcano on March 26, 2009. Picture Date: March 26, 2009. Image Creator: Tina Neal. Image courtesy of AVO/USGS.
Photograph taken during observation / gas collection flight to Redoubt Volcano on March 26, 2009. Picture Date: March 26, 2009. Image Creator: Tina Neal. Image courtesy of AVO/USGS.
View west across Drift River of small eruption cloud over Redoubt volcano. Picture Date: March 26, 2009 16:08:16 AKDT. Image Creator: Game McGimsey. Image courtesy of AVO/USGS.
Photograph of Redoubt’s ash cloud, taken on the morning of Thursday, March 26, 2009, by Robert Cole, Peninsula Airways pilot. Image courtesy of Robert Cole and PenAir.
View of the ash-covered lower Crescent River Valley. Picture Date: March 26, 2009 17:17:25 AKDT. Image Creator: Game McGimsey. Image courtesy of AVO/USGS.
OMI sulfur dioxide satellite image from the March 23 2009 eruptive events at Redoubt volcano. Colors represent relative amount of gas with dark orange/red being the highest and blue/purple the lowest. This is from combining 2 OMI orbits for March 23 2009. AURA/OMI: 03/23/2009 20:43 – 22:34 UTC, SO2 mass: 42.152 kt; Area: 285,359 km2, SO2 max: 58.87 DU at Lon: -149.05, Lat: 61.58. These data are from NASA’s EOS-Aura satellite and its Ozone Monitoring Instrument (OMI), courtesy of Dr. Simon Carn, Michigan Technology University. Picture Date: March 25, 2009.
Photograph of ash fall at Homestead Lodge, about 35 miles south of Redoubt, on the western side of Cook Inlet. View is of the backyard, with ash. Picture Date: March 26, 2009. Image Creator: James Isaak. Image courtesy of the photographer.
SEM image of ash particles erupted by Redoubt volcano on March 22, 2009. The ash sample was collected during the ashfall in Healy, Alaska by Pavel Izbekov on March 23, 2009. The image was acquired by Pavel Izbekov and Jill Shipman using ISI-50 Scanning Electron Microscope at the Advanced Instrumentation Laboratory, University of Alaska Fairbanks. Picture Date: March 24, 2009. Image Creator: Pavel Izbekov. Jill Shipman. Image courtesy of the AVO/UAF-GI.
Related Links and volcano entries for March 2009:
Posted in Alaska volcanoes, ashfall, Aura Omi, EOS-Aura satellite, SO2 | Tagged: Homer, redoubt erupts, Redoubt Latest, Redoubt Recent Images, Redoubt Volcano | 1 Comment »
Posted by feww on March 24, 2009
AVHRR (Advanced Very High Resolution Radiometer) false-color satellite image showing the eruption cloud from an explosion at Redoubt Volcano at 3:31am AKDT on March 23rd 2009. Image was captured at 5:30am and shows the ash cloud passing over other volcanoes and heading NE towards Anchorage. Picture Date: March 23, 2009 14:30:29 UTC . Image Creator: John Bailey. Image courtesy of the AVO/UAF-GI.
Fine ash deposited on a windshield of the car during the 3/23/2009 ash fall in Healy, AK. Picture Date: March 23, 2009 15:38:00 AKDT. Image Creator: Pavel Izbekov. Image courtesy of the AVO/UAF-GI.
SEM image of ash particle from the 3/23/2009 ash fall in Healy, AK. Picture Date: March 24, 2009. Image Creator: Pavel Izbekov; Jill Shipman. Image courtesy of the AVO/UAF-GI.
Tephra deposits from the eruption of Redoubt Volcano
Photos of the flooding in Drift Valley and tephra deposits from the eruption of Redoubt Volcano. [more detailed caption to follow.] Picture Date: March 23, 2009. Image Creator: Game McGimsey. Image courtesy of AVO/USGS.
Massive flooding in Drift Valley from the eruption of Redoubt Volcano
Massive flooding in Drift Valley from the eruption of Redoubt Volcano. Picture Date: March 23, 2009. Image Creator: Game McGimsey. Image courtesy of AVO/USGS.
Earth Observatory Images of Ash plumes ejected by Redoubt Volcano. Above image was acquired March 23, 2009 at 12:30am AKDT [Add 8 hrs for UTC.] The above Terra MODIS image was captured at 12:30 a.m. March 23, just 16 minutes after the third large eruption. Two plumes of ash are visible: a long white plume reaching north, and a smaller one just northeast the volcano. Communities along the trajectory of the ash plume included Skwenta and Talkeenta. NASA images created by Jesse Allen, using data provided courtesy of the MODIS Rapid Response team.
The Aqua MODIS image was captured four hours later, at 4:30 a.m. AKDT, just as the fifth large eruption began. At that time, the new ash plume was located directly over Mt. Redoubt. NASA images created by Jesse Allen, using data provided courtesy of the MODIS Rapid Response team. Instrument: Aqua – MODIS
Ash on the snow to the NNE of Redoubt
MODIS image from Terra, 23 March 2009, 2149Z. Courtesy of GINA. Ash on the snow to the NNE of Redoubt. Picture Date: March 23, 2009 21:49:00 UTC. Image Creator: Jonathan Dehn. Image courtesy of the Geographic Information Network of Alaska.
Eruption events 1, 2, 3, 4, and 6 from Redoubt Volcano on 22 and 23 March 2009
Montage of various satellite images, from different times, showing eruption events 1, 2, 3, 4, and 6 from Redoubt Volcano on 22 and 23 March 2009. There were multiple eruption events, this number of seven is one preliminary interpretation and may be subject to change upon further review. Picture Date: March 23, 2009. Image Creator: Ken Dean. Image courtesy of the AVO/UAF-GI.
Redoubt Volcano Latest Observations from AVO: 2009-03-24 00:35 UTC
The eruption of Redoubt volcano continues and the color code and volcano alert level remains at RED/WARNING. Seismic activity remains elevated, but has declined slightly over the past several hours. The activity consists mostly of volcanic tremor with some discrete events.
Related Links:
this post: 9 images +1 image link; 567 words; two links
Posted in Aqua MODIS, AVHRR, Drift glacier, Terra MODIS, volcano alert | Tagged: alaska volcano, Anchorage, hays, Redoubt Volcano, spurr | 2 Comments »
Posted by feww on March 23, 2009
On 2009-03-23 at 02:04:08 (10:04:08UTC) AVO said:
As of 2:00AM March 23, 2009, AVO has recorded FOUR large explosions at Redoubt volcano at the following times:
[Add 8 hrs to get time in UTC]
The National Weather Service has issued an Ashfall Advisory. Link: http://pafc.arh.noaa.gov/volcano.php
Crater showing rapidly melting glacier and enlarged “ice piston” feature. Picture Date: March 21, 2009. Image Creator: Cyrus Read. Image courtesy of AVO/USGS.
Top vent in the Redoubt summit crater. Picture Date: March 21, 2009. Image Creator: Cyrus Read. Image courtesy of AVO/USGS.
Looking south at the north flank of Redoubt volcano. Ashfall limited to south crater floor, rim, and extending south-southeast. Source of ash is a vent south of the 1990 dome at an elevation of ~8300 ft. (~2, 530m). Picture Date: March 15, 2009 – Image Creator: Heather Bleick. Image courtesy of AVO/USGS.
AVO/USGS Volcanic Activity Notice
Issued: Sunday, March 22, 2009, 11:26 PM AKDT (20090322/0726Z)
Source: Alaska Volcano Observatory (AVO)
Notice Number: 2009/A12
Location: N 60 deg 29 min W 152 deg 44 min
Elevation: 10197 ft (3,108 m)
Area: Cook Inlet-South Central Alaska
Volcanic Activity Summary: The eruption of Mt. Redoubt continues. The height of the eruption cloud is estimated to be 50,000 ft above sea level. Further reports will be issued as more information becomes available.
Recent Observations:
[Volcanic cloud height] The height of the eruption cloud is estimated to be 50,000 ft above sea level. Further reports will be issued as more information becomes available.
[Other volcanic cloud information] Nil
[Mudflow] Mudflows are possible on Drift and Crescent Rivers.
[Ash fall] Ashfall likely in the vicinity of and downwind from the volcano.
Location of Redoubt volcano, in relationship to surrounding towns, roads, and other volcanoes. Image Date: September 26, 2008. Image Creator: Janet Schaefer. Image courtesy of the AVO/ADGGS.
Contacts: Tom Murray, Scientist-in-Charge, USGS
tlmurray@usgs.gov (907) 786-7497
Steve McNutt, Coordinating Scientist, UAF
steve@giseis.alaska.edu (907) 474-7131
Mount Redoubt rises to 3108 m on the west side of Cook Inlet, 170 km SW of Anchorage. Redoubt volcano was constructed over a basement of glacially eroded Mesozoic granitic rocks, seen here in the foreground. The volcano has been very active during the Holocene, producing at least 30 tephra layers in the Cook Inlet basin stratigraphy. A steam plume rises from the summit crater, which is breached to the north, in this view from the NW following its 1989-90 eruption. Iliamna volcano is visible in the left distance. Photo by Christina Neal (U.S. Geological Survey, Alaska Volcano Observatory). Caption GVP.
Next Notice: A new VAN will be issued if conditions change significantly or alert levels are modified. While a VAN is in effect, regularly scheduled updates are posted at
http://www.avo.alaska.edu
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.
URGENT – WEATHER MESSAGE
NATIONAL WEATHER SERVICE ANCHORAGE AK
240 AM AKDT MON MAR 23 2009
SUSITNA VALLEY-
INCLUDING THE CITIES OF, TALKEETNA, WILLOW, CANTWELL
THE ASHFALL ADVISORY IS NOW IN EFFECT UNTIL 8 AM AKDT THIS
MORNING.
REDOUBT VOLCANO AT 60.5N 152.7W HAS ERUPTED SEVERAL TIMES DURING
THE NIGHT. LIGHT ASHFALL HAS ALREADY BEEN REPORTED AT SKWENTNA.
LIGHT ASHFALL IS POSSIBLE THROUGHOUT THE SUSITNA VALLEY THIS
MORNING.
PRECAUTIONARY/PREPAREDNESS ACTIONS…
AN ASHFALL ADVISORY MEANS THAT ASH WILL BE DEPOSITED IN THE
ADVISORY AREA. PEOPLE IN AREAS OF ASHFALL SHOULD SEAL WINDOWS AND
DOORS. PROTECT ELECTRONICS AND COVER AIR INTAKES AND OPEN WATER
SUPPLIES. MINIMIZE DRIVING. LISTEN TO YOUR RADIO STATION FOR
FURTHER INFORMATION.
Redoubt Ashfall – Current trajectory model. NOAA/NWS FO
Webcam image – dated March 15, 2009. AVO/USGS
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Posted in explosions at Redoubt, SKWENTNA, Susitna Valley, Talkeetna, Willow | Tagged: Alaska, Cook Inlet, Redoubt, redoubt erupts, Redoubt Volcano | Leave a Comment »
Posted by feww on March 18, 2009
Seismic activity low and marked by small discrete earthquakes. Partly cloudy satellite and HutCam views show no sign of activity.
View of Redoubt steaming on March 15, 2009, taken by David Wartinbee, from Soldotna, AK. via AVO. Image courtesy of the photographer.
Seismic activity at Mount Redoubt increased at about 1:05 AKDT Sunday afternoon (March 15, 2009) and approximately 4 hours of continuous volcanic tremor ensued. The onset of the tremor was associated with a small explosion that produced a plume of gas and ash that rose to about 15,000 feet above sea level and deposited a trace amount of ash over the summit-crater floor and down the south flank of the volcano to about 3,000 feet. AVO responded to this increase in activity by raising the color code and alert level to ORANGE/WATCH at 2:50 PM AKDT. At this time it does not appear that the increase in activity heralds a significant eruption in the short term, but conditions may evolve rapidly.
An AVO overflight Sunday witnessed activity from 11:30 AM until about 3:00 PM and was able to document ash emission from a new vent, just south of the 1990 lava dome and west of the prominent ice collapse feature near the north edge of the summit crater. Although ash emission was short lived, it represents the first documented ash fall during the current episode of unrest at Mount Redoubt.
About twenty minutes after the initial steam and ash burst, a sediment-laden flow occurred from a small area in the ice at about 7000 feet on upper Drift glacier. This flow descended about 1500 feet and produced a distinctive seismic signature seen across the Redoubt network.
Although the intent of the overflight was make airborne gas measurements, only a few such measurements were possible due to the uncertain nature of the activity and potential for further ash emission. The measurements that were made indicated at least a qualitative increase in SO2 emission relative to levels measured previously. The gas data are currently being processed and will be available soon.
Photograph taken during observation / gas data collection flight to Redoubt Volcano on March 15, 2009 [13:10:28 AKDT] Image Creator: Bill Burton; courtesy of AVO/USGS.
Interpretation of New Activity and Possible Outcomes
Although preliminary, it is likely that the plume observed just after 1:00 PM AKDT on Sunday, March 15, 2009 was produced by a steam explosion in the shallow hydrothermal system of the volcano. Without examination of the ash we cannot say with certainty if the ash represents new magma or if it is merely pulverized old material from the surface of the volcano.
Steam-driven explosions are not unexpected events at Redoubt given the amount of heat that is being released at the surface. It is possible that more such explosions can occur with little or no warning. It is possible that these plumes can reach above 20,000 feet, and may contain minor amounts of fine ash.
Relatively rapid increases in seismic activity, and an overall waxing and waning pattern to the seismicity at Redoubt may persist for weeks to months. Increases in seismicity may or may not be associated with other volcanic phenomena, such as minor ash emission, and vigorous steaming. The burst of activity at Redoubt on March 15, 2009 indicates that the volcano is still in a restless condition.
AVO plans to visit Redoubt later this week to attempt collection of ash samples, retrieve GPS data and do some routine maintenance of seismic and other equipment.
AVO has resumed 24 hour per day staffing of the AVO operations center in Anchorage. http://www.avo.alaska.edu/activity/Redoubt.php
Ascending eruption cloud from Redoubt Volcano and its reflection in the waters of Cook Inlet. View is to the west from the Kenai Peninsula. Photograph by J. Warren, April 21, 1990. Source: AVO
FEWW believes there’s a 60 percent probability Redoubt Volcano may erupt violently this year, possibly by July 2009.
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Posted in eismicity at Redoubt, hydrothermal system, Mount Redoubt, SO2 emission, steam explosion | Tagged: AVO, Earthquakes, Redoubt Activity, Redoubt Volcano, seismic activity | 1 Comment »
Posted by feww on February 4, 2009
Hot smoke and gas were ejected from two new fumaroles that appeared in the snow and ice layer on Alaska’s Redoubt Volcano.
Photo by Chris Waythomas, Alaska Volcano Observatory /U.S. Geological Survey (USGS)
The AVO researchers reported that the ice layer surrounding the volcano is melting rapidly because of the hot gasses that are spewing out of the fumaroles. The gases reportedly include carbon dioxide, hydrogen sulfide, and sulfur dioxide, which means magma is edging upward. AVO scientists also believe new magma has entered Redoubt, which means that there is strong possibility the volcano will explode in the near future.
The 3,108-meter volcano, considered the 9th most active in the U.S., is about 170 kilometers from Anchorage, Alaska.
AVO report dated 2009-02-03 15:02:56
“Unrest at Redoubt Volcano continues. Seismic activity remains elevated above background. Clear web camera images show no activity at the volcano. An AVO crew is working near the volcano today. They have installed one new seismic station and are presently working on a second installation. AVO is monitoring the volcano 24 hours a day.”
Based on their knowledge of Redoubt’s past activities, both historical and from the geologic record, and their analysis of the current episode of unrest, AVO suggests four possible scenarios:
Based on all available monitoring data and AVOs knowledge of the volcano, scenario number two, an eruption similar to or smaller than that of 1989-90, appears to be the most probable outcome at this time. We consider one and three to be somewhat less likely, and scenario four to be much less likely. —AVO
For more information see Redoubt Interpretation and Hazards.
Geologic Summary: Redoubt is a 3108-m-high glacier-covered stratovolcano with a breached summit crater in Lake Clark National Park about 170 km SW of Anchorage. Next to Mount Spurr, Redoubt has been the most active Holocene volcano in the upper Cook Inlet. Collapse of the summit of Redoubt 10,500-13,000 years ago produced a major debris avalanche that reached Cook Inlet. Holocene activity has included the emplacement of a large debris avalanche and clay-rich lahars that dammed Lake Crescent on the south side and reached Cook Inlet about 3500 years ago. Eruptions during the past few centuries have affected only the Drift River drainage on the north. Historical eruptions have originated from a vent at the north end of the 1.8-km-wide breached summit crater. The 1989-90 eruption of Redoubt had severe economic impact on the Cook Inlet region and affected air traffic far beyond the volcano. [Source: GVP]
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Content: 500 words, 1 image, 8 links
Posted in Explosive Eruption, magma, Mount Spurr, Redoubt Scenarios, Redoubt unrest | Tagged: Alaska, Cook Inlet. Anchorage, Lake Clark National Park, Redoubt Volcano, stratovolcano | 1 Comment »
Posted by msrb on October 4, 2008
Information Statement – Friday, October 3, 2008 10:37 AM AKDT (10:37 UTC)
Current Aviation Color Code: GREEN
Annotated photo of Redoubt Volcano from the north, including features seen on 27 September, 2008.
Picture Date: September 27, 2008 – Image Creator: Kate Bull – Image courtesy of the AVO/ADGGS.
Full Size
Starting September 16, reports of strong hydrogen sulfide odor and loud noises coming from the direction of the volcano were reported. AVO observation flight on September 27 revealed:
AVO believes Redoubt’s increased fumarolic activity and presence of sulfur odors do not suggest an imminent eruption, despite similar observations being made in the months preceding the 1989-1990 eruption, when seismicity also increased significantly. AVO expects a similar strong increase in seismicity first before an eruption occurs.
Notes:
In the 1989-90 eruption lahar traveling down the Drift River partially inundated the Drift River Oil Terminal facility. Ash plumes produced during the same eruption affected international air traffic with traces of ashfall falling on Anchorage and nearby communities. (AVO)
Posted in Drift glacier, Drift River, Drift River Oil, fumarolic activity, Seismicity | Tagged: 'Phantom Unrest', Alaska, ash plume, AVO, Redoubt Volcano | Leave a Comment »
Fire Earth 