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Wed, Dec. 6, 2023-12:03:47am
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Wed, Dec 6, 2023 - 12:01am |
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Volcanic Descriptions
- Volcano Alert Levels Description
- Aviation Color Codes Description
- Volcanic Eruption: Major Types
- Types of Volcanoes
Description
From Miller et al (1998): "Redoubt Volcano is a steep-sided cone about 10 km in diameter at its base and with a volume of 30-35 cubic kilometers. The volcano is composed of intercalated pyroclastic deposits and lava flows and rests on Mesozoic granitic rocks of the Alaska-Aleutian Range batholith (Till and others, 1993; 1994). It has been moderately dissected by the action of numerous alpine glaciers. A 1.8-km-wide, ice-filled summit crater is breached on the north side by a northward-flowing glacier, informally known as the Drift Glacier, which spreads into a piedmont lobe in the upper Drift River Valley. The most recently active vent is located on the north side of the crater at the head of the Drift glacier. Holocene lahar deposits in the Crescent River and Drift River valleys extend downstream as far as Cook Inlet."
ALASKA VOLCANO OBSERVATORY WEEKLY UPDATE
U.S. Geological Survey
Tuesday, December 5, 2023, 9:24 AM PST (Tuesday, December 5, 2023, 17:24 UTC)
Monitored CALIFORNIA VOLCANOES
Current Volcano Alert Level: all NORMAL
Current Aviation Color Code: all GREEN
Activity Update: All volcanoes monitored by CalVO show normal background earthquake activity and ground movement. Monitored volcanoes include Mount Shasta, Medicine Lake Volcano, Lassen Volcanic Center, Clear Lake Volcanic Field, Long Valley Volcanic Region, Coso Volcanic Field, Ubehebe Craters, and Salton Buttes.
Past Week Observations for November 27, 2023 (0000h PST) through December 3, 2023 (2359h PST):
Typical seismicity was recorded at The Geysers geothermal field south of the Clear Lake Volcanic Field; 103 earthquakes greater than M1 were recorded, with the largest having a magnitude of M2.3.
Four earthquakes greater than M1 were recorded in the Sierra Nevada Block, south of Mammoth Mountain and Long Valley, with the largest having a magnitude of M2.5.
Three earthquakes larger than M1 were recorded within the Coso Volcanic Field, with the largest having a magnitude of M1.8. One earthquake greater than M1 was recorded near Salton Buttes with a magnitude of M1.3.
CalVO's Weekly Update only highlights volcanoes which have experienced seismic activity or volcanic unrest. If there are no comments for a volcano, CalVO has detected no earthquakes with magnitudes greater than or equal to M1.0, or any other kind of unrest. Only earthquakes with magnitudes greater than M1.0 are reported here.
These earthquake counts are preliminary and subject to change as the earthquakes are reviewed by seismologists. The ALASKA VOLCANO OBSERVATORY WEEKLY UPDATE
U.S. Geological Survey will continue to monitor these volcanoes closely and will issue additional updates and changes in alert level as warranted. For a definition of alert levels see http://volcanoes.usgs.gov/activity/alertsystem/icons.php.
As part of the ALASKA VOLCANO OBSERVATORY WEEKLY UPDATE
U.S. Geological Survey's Volcano Hazards Program, the California Volcano Observatory monitors the volcanoes of California and Nevada and advances scientific understanding of volcanic processes in order to reduce the harmful impacts of volcanic activity. For additional USGS CalVO volcano information, background, images, and other graphics visit http://volcanoes.usgs.gov/observatories/calvo/. For general information on the USGS Volcano Hazard Program visit http://volcanoes.usgs.gov. Statewide seismic information for California and Nevada can be found at https://earthquake.usgs.gov/earthquakes/map/.
Source: Alaska Volcano Observatory
This is a static image of Mount Redoubt,
The VolcanoCam image automatically updates approximately every two hours.
Volcano image courtesy of ...
Live webcam images of various Alaskan volcanoes
Alaska Volcano Observatory Webcam - Redoubt - DFR
Images of Mount Redoubt |
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Gallery 1 | Gallery 2 |
U.S. Geological Survey, the University of Alaska Fairbanks Geophysical Institute, and the Alaska Division of Geological and Geophysical Surveys.
- USGS Cascades Volcano Observatory
- Cascade Range Current Update
- USGS Alert-Notification System for Volcanic Activity
- Volcano Observatories: Alaska
- Volcano Observatories: Cascades
- Volcano Observatories: Hawaii
- Volcano Observatories: Long Valley
- Volcano Observatories: Mariana Islands
- Volcano Observatories: Yellowstone
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