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Archive for the ‘Drift River’ Category

Redoubt Volcano settling down?

Posted by feww on July 1, 2009

Is Redoubt going back to sleep?

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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Redoubt’s ‘Phantom Unrest’ Could Lead to Eruption

Posted by msrb on October 4, 2008

Alaska Volcano Observatory

Information Statement – Friday, October 3, 2008 10:37 AM AKDT (10:37 UTC)

Redoubt Volcano

  • Type of Volcano: Stratovolcano
  • Coordinates: 60°29’7″ N 152°44’38” W
  • Summit Elevation: 10197 ft (3108 m)
  • Recent Eruptions:1902, 1966-68, and 1989-90
  • Location: Western side of Cook Inlet, about 170 km southwest of Anchorage and 82 km east of Kenai, Alaska
  • Current Volcano Alert Level: NORMAL

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

What’s up at Redoubt?

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:

  • A number of fractures and circular openings in the upper Drift glacier for the first time.
  • Scientist noted a strong hydrogen sulfide odor, but onboard instrumentation recorded no sulfur dioxide.
  • Fumaroles on top of  domes formed in the 1968 and 1990 eruptions showed more vigorous steaming than the last observation in mid-August.
  • AVO’s seismic network detected no abnormal earthquake activity, despite the earlier reports.

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: , , , , | Leave a Comment »