Current Alerts for U.S. Volcanoes

  • 2015-02-27 19:06:46 Kilauea Warning Orange
  • 2015-02-27 14:03:42 Shishaldin Watch Orange
  • 2015-02-27 14:03:42 Cleveland Advisory Yellow
  • 2015-02-27 08:27:35 Pagan Advisory Yellow
  • 2015-02-27 09:35:33 Cascade Range Normal Green
  • 2015-02-11 10:41:02 Haleakala Normal Green
  • 2015-02-11 10:41:02 Hualalai Normal Green
  • 2015-02-11 10:41:02 Mauna Kea Normal Green
  • 2015-02-11 10:41:02 Mauna Loa Normal Green
  • 2015-02-26 14:44:28 Veniaminof Normal Green
  • 2015-02-02 14:10:46 Yellowstone Normal Green
  • 2015-02-11 10:41:02 Lo`ihi Unassigned Unassigned

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Friday, February 27, 2015 2:03 PM PST (Friday, February 27, 2015 22:03 UTC)

54°45'19" N 163°58'16" W, Summit Elevation 9373 ft (2857 m)
Current Volcano Alert Level: WATCH
Current Aviation Color Code: ORANGE

Elevated surface temperatures were detected in satellite data from Shishaldin throughout the week. A low-level plume was was observed from the volcano in web camera images on Feb. 25. Seismicity remains above background levels. On Feb. 26, AVO received an observation from a mariner in the area reporting a low-level plume extending from the volcano summit to the north. In addition, the observer reported seeing an orange glow from the summit. Low-level eruptive activity confined to the summit crater of the volcano likely continues.

Shishaldin volcano, located near the center of Unimak Island in the eastern Aleutian Islands, is a spectacular symmetric cone with a base diameter of approximately 16 km (10 mi). A 200-m-wide (660 ft) funnel-shaped summit crater typically emits a steam plume and occasional small amounts of ash. Shishaldin is one of the most active volcanoes in the Aleutian volcanic arc, with at least 54 episodes of unrest including over 24 confirmed eruptions since 1775. Most eruptions are relatively small, although the April-May 1999 event generated an ash column that reached 45,000 ft above sea level.

52°49'20" N 169°56'42" W, Summit Elevation 5676 ft (1730 m)
Current Volcano Alert Level: ADVISORY
Current Aviation Color Code: YELLOW

Weakly elevated surface temperatures were detected at Cleveland in satellite data on Feb. 25. The volcano was obscured by cloudy weather in satellite images for the remainder of the week. A small low-level steam/gas plume was seen emanating from the summit of Cleveland on Feb. 24. Web camera views were obscured by clouds during the rest of the week. No significant events in seismic or infrasound (air pressure) data were detected.

Cleveland volcano forms the western portion of Chuginadak Island, a remote and uninhabited island in the east central Aleutians. The volcano is located about 75 km (45 mi) west of the community of Nikolski, and 1500 km (940 mi) southwest of Anchorage. The most recent significant period of eruption began in February, 2001 and produced 3 explosive events that generated ash clouds as high as 39,000 ft above sea level. The 2001 eruption also produced a lava flow and hot avalanche that reached the sea. Since then, Cleveland has been intermittently active producing small lava flows, often followed by explosions that generate small ash clouds generally below 20,000 ft above sea level. These explosions also launch debris onto the slopes of the cone producing hot pyroclastic avalanches and lahars that sometimes reach the coastline.


Other Alaska volcanoes show no signs of significant unrest:

AVO scientists conduct daily checks of earthquake activity at all seismically-monitored volcanoes, examine web camera and satellite images for evidence of airborne ash and elevated surface temperatures, and consult other monitoring data as needed.

For definitions of Aviation Color Codes and Volcano Alert Levels, see:





Chris Waythomas, Acting Scientist-in-Charge, USGS (907) 786-7497

Jeff Freymueller, Coordinating Scientist, UAFGI (907) 322-4085

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.

AVO Alert Archive Search
Friday, February 27, 2015 9:35 AM PST (Friday, February 27, 2015 17:35 UTC)

Current Volcano Alert Level: NORMAL
Current Aviation Color Code: GREEN

Activity Update: All volcanoes in the Cascade Range of Oregon and Washington are at normal background levels of seismicity. These include Mount Baker, Glacier Peak, Mount Rainier, Mount St. Helens, and Mount Adams in Washington State; and Mount Hood, Mount Jefferson, Three Sisters, Newberry, and Crater Lake in Oregon. Complimentary data from geodetic, hydrologic, and geochemical monitoring systems installed at subsets of Cascade Range volcanoes also did not reveal any anomalous activity.

Recent Observations: Seismicity at Cascade Range volcanoes in Washington and Oregon was at background levels during the week. Field crews took advantage of good weather earlier in the week to repair stations in the crater and on the flanks of Mount St. Helens and to survey sections along the North Fork of the Toutle River.

Mount St. Helens Seismic Information
CVO Alert Archive Search
U.S. Geological Survey
Friday, February 27, 2015 7:06 PM HST (Saturday, February 28, 2015 05:06 UTC)

19°25'16" N 155°17'13" W, Summit Elevation 4091 ft (1247 m)
Current Volcano Alert Level: WARNING
Current Aviation Color Code: ORANGE

USGS Hawaiian Volcano Observatory (HVO) scientists conducted a helicopter overflight of the June 27th lava flow today and mapped its perimeter. At the time of the flight, scattered breakouts were observed upslope of the flow tip that had stopped advancing earlier this week, located from about 0.6 to 2.7 km (0.4 to 1.7 mi) upslope of the inactive tip. Small breakouts were also active west of Kaohe Homesteads. The breakout on the flank of Puʻu ʻŌʻō was active during the overflight, but had advanced only about 80-100 m (90-110 yd) since Monday, February 23. Two breakouts by Kahaualeʻa were also active today. The more northerly breakout was no longer spreading into the forest; surface flows were scattered within the margins of the flow. The northeasterly breakout advanced about 500 m (550 yd) since Monday, February 23, but its leading edge was not active today. HVO geologists were not able to make measurements of the cross-sectional area of the lava tube because of the active breakouts on the flank of Puʻu ʻŌʻō; the survey line was partially buried by these breakouts.

Daily updates about Kīlauea's ongoing eruptions, recent images and videos of summit and East Rift Zone volcanic activity, and data about recent earthquakes are posted on the HVO Web site at

Additional Information:

Maps, photos, Webcam views, and other information about Kīlauea Volcano are available at A daily update summary is available by phone at (808) 967-8862.

For a definition of volcano alert levels and aviation color codes:

A map with details of earthquakes located within the past two weeks can be found at

HVO Contact Information:

The Hawaiian Volcano Observatory is one of five volcano observatories within the U.S. Geological Survey and is responsible for monitoring volcanoes and earthquakes in Hawai`i.

HVO Alert Archive Search
U.S. Geological Survey
Friday, January 16, 2015 9:02 PM PST (Saturday, January 17, 2015 05:02 UTC)

Current Volcano Alert Level: all NORMAL
Current Aviation Color Code: all GREEN

Activity Update: All volcanoes monitored by CalVO using telemetered, real-time sensor networks exhibit normal levels of background seismicity and deformation. Volcanoes monitored include Mount Shasta, Medicine Lake Volcano, Clear Lake Volcanic Field, Lassen Volcanic Center, Long Valley Volcanic Region, Coso Volcanic Field, Ubehebe Craters, and Salton Buttes.

Observations for December 1, 2014 (0000h PDST) through December 31, 2014 (2359h PST):
Mt Shasta: One M1.44 earthquake was detected.
Medicine Lake: No earthquakes of M1.0 or greater were detected.
Lassen Volcanic Center: Seven earthquakes of M1.0 or greater were detected. The largest registered M2.12.
Clear Lake Volcanic Field: Two earthquakes of M1.0 were detected. The largest registered was M1.76. [Note: The typical high level of seismicity was observed under the Geysers steam field located at the western margin of CLVF. The largest event was M2.94].
Long Valley Volcanic Region: In Long Valley Caldera, 17 earthquakes of M1.0 or greater were detected (M2.17 maximum). In the Mono Craters region, two earthquakes of M1.0 or greater were detected (M1.50 maximum), and one M1.10 earthquake was detected under Mammoth Mountain. [Note: The typical high level of seismicity was observed south of the caldera in the Sierra Nevada range. The largest registered M2.92].
Ubehebe Craters:No earthquakes at or above M1.0 were detected.
Salton Buttes: The typical high level of seismicity was observed in the vicinity of the buttes, with 13 earthquakes of M1.0 or greater. The largest registered was M4.19.
Coso Volcanic Field: The typical high level of seismicity was observed, with 13 earthquakes M1.0 or greater. The largest registered M1.50.

The 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

As part of the U.S. Geological Survey's Volcano Hazards Program, the California Volcano Observatory aims to advance scientific understanding of volcanic processes and lessen the harmful impacts of volcanic activity in the volcanically active areas of California and Nevada. For additional USGS CalVO volcano information, background, images, and other graphics visit For general information on the USGS Volcano Hazard Program Statewide seismic information for California and Nevada can be found at

CalVO Alert Archive Search
Friday, February 27, 2015 8:27 AM PST (Friday, February 27, 2015 16:27 UTC)

Report prepared by the U.S. Geological Survey.

18°7'48" N 145°48' E, Summit Elevation 1870 ft (570 m)
Current Volcano Alert Level: ADVISORY
Current Aviation Color Code: YELLOW

Seismic, infrasound, and web camera data from Pagan Volcano remain temporarily unavailable. Satellite views over the past week have been mostly obscured by clouds.

Volcanic gas from Pagan may be noticed downwind of the volcano as a distinctive sulfurous odor. Additional information about volcanic gas and vog can be found on the web at this address:

Access to the island may be restricted by the CNMI government. Contact the EMO for the latest information.

Equipment failure on 29 December 2014 resulted in the loss of seismic data from Sarigan and Anatahan. Recent field visits to these volcanoes has restored the flow of seismic data, and USGS is now able to continue with routine seismic monitoring of Anatahan and Sarigan. Analysis of satellite images showed no signs of activity at these or any of the other volcanoes in the Northern Mariana Islands.

For definitions of Aviation Color Codes and Volcano Alert Levels, see:


USGS Northern Mariana Duty Scientist (808) 967-8815

CNMI Homeland Security and Emergency Management Office (670) 664-2216

NMI Alert Archive Search
Monday, February 2, 2015 2:10 PM MST (Monday, February 2, 2015 21:10 UTC)

44°25'48" N 110°40'12" W, Summit Elevation 9203 ft (2805 m)
Current Volcano Alert Level: NORMAL
Current Aviation Color Code: GREEN


During January 2015, the University of Utah Seismograph Stations, responsible for the operation and analysis of the Yellowstone Seismic Network, reports 178 earthquakes were located in the Yellowstone National Park region. The largest event was a small earthquake of magnitude 1.9 on January 20, at 9:03 PM MST, located 6 miles north of West Yellowstone, Montana.

January seismicity was dominated by an earthquake swarm occurring on January 20 to 21st, about 6 miles north of West Yellowstone, Montana, accounting for 135 earthquakes (ranging in magnitude from -0.7 to 1.9). The swarm included the largest earthquake in January (detailed above).

Yellowstone earthquake activity is at background levels.

Ground deformation

After a fascinating year of ups and downs, deformation in north-central Yellowstone has returned to near background levels.

Caldera GPS stations continue to record the pattern of slow uplift that has persisted since the beginning of 2014. An example can be found at: (click on Static Plots / Time Series)

The Yellowstone Volcano Observatory (YVO) provides long-term monitoring of volcanic and earthquake activity in the Yellowstone National Park region. Yellowstone is the site of the largest and most diverse collection of natural thermal features in the world and the first National Park. YVO is one of the five USGS Volcano Observatories that monitor volcanoes within the United States for science and public safety.

YVO Member agencies: USGS, Yellowstone National Park, University of Utah, University of Wyoming, UNAVCO, Inc., Wyoming State Geological Survey, Montana Bureau of Mines and Geology, Idaho Geological Survey

Jacob Lowenstern, Scientist-in-Charge

YVO Alert Archive Search