Current Alerts for U.S. Volcanoes

  • 2015-10-09 12:25:39 Cleveland Watch Orange
  • 2015-10-09 09:06:04 Kilauea Watch Orange
  • 2015-10-09 12:25:39 Shishaldin Watch Orange
  • 2015-10-08 10:58:00 Mauna Loa Advisory Yellow
  • 2015-10-09 10:15:24 Pagan Advisory Yellow
  • 2015-10-09 12:25:39 Veniaminof Advisory Yellow
  • 2015-10-09 10:30:43 Cascade Range Normal Green
  • 2015-10-06 16:26:18 Haleakala Normal Green
  • 2015-10-06 16:28:30 Hualalai Normal Green
  • 2015-09-30 15:13:23 Katmai Normal Green
  • 2015-10-06 16:29:20 Mauna Kea Normal Green
  • 2015-10-01 10:13:59 Yellowstone Normal Green
  • 2015-10-06 16:30:36 Lo`ihi Unassigned Unassigned

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Friday, October 9, 2015 12:25 PM AKDT (Friday, October 9, 2015 20:25 UTC)

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

Nothing significant observed in partly cloudy web camera and satellite views of the volcano over the past week. No significant activity was detected in seismic or infrasound (pressure sensor) data this week.

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.

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

Seismic activity continues at levels above background and has changed little over the past week. Thermal signals and minor steaming have been observed intermittently in satellite and web camera views of the volcano during the past week. It remains possible that very low level eruptive activity is continuing within the summit crater of the volcano.

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.

56°11'52" N 159°23'35" W, Summit Elevation 8225 ft (2507 m)
Current Volcano Alert Level: ADVISORY
Current Aviation Color Code: YELLOW

Slightly elevated levels of seismicity were detected throughout the past week. Nothing of note was observed in satellite views of the volcano over the past week. Occasional clear web camera images this week showed a small steam plume issuing from the intracaldera cone.

Mount Veniaminof volcano is an andesitic stratovolcano with an ice-filled 10-km diameter summit caldera located on the Alaska Peninsula, 775 km (480 mi) southwest of Anchorage and 35 km (22 mi) north of Perryville. Veniaminof is one of the largest (~300 cubic km; 77 cubic mi) and most active volcanic centers in the Aleutian Arc and has erupted at least 13 times in the past 200 years. Recent significant eruptions of the volcano occurred in 1993-95, 2005, and 2013. These were Strombolian eruptions that produced lava fountains and minor emissions of ash and gas from the main intracaldera cone. During the 1993-95 activity, a small lava flow was extruded, and in 2013, five small lava flows effused from the intracaldera cone over about five months. Minor ash-producing explosions occurred nearly annually between 2002 and 2010. Previous historical eruptions have produced ash plumes that reached 20,000 ft above sea level (1939 and 1956) and ash fallout that blanketed areas within about 40 km (25 mi) of the volcano (1939).


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:





John Power, Scientist-in-Charge, USGS (907) 786-7497

Jessica Larsen, Acting 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, October 9, 2015 10:30 AM PDT (Friday, October 9, 2015 17:30 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. Additionally, GPS data from most of the major volcanoes, and sparse real-time hydrologic and geochemical monitoring, show no anomalous activity.

Recent Observations: Monitoring data showed no significant changes in activity at Cascade Range volcanoes during the past week. Field crews conducted station maintenance at Mount Rainier, firmware upgrades at Newberry volcano, and geology investigations at Mount Jefferson. Scientists noted late Wednesday morning that sensors near the SF Toutle river at Mount St Helens indicated likely occurrence of two or three small, short duration debris flows that may have traveled as far as the Loowit trail crossing.

Mount St. Helens Seismic Information
CVO Alert Archive Search
U.S. Geological Survey
Friday, October 9, 2015 9:06 AM HST (Friday, October 9, 2015 19:06 UTC)

This report on the status of Kīlauea volcanic activity was prepared by the USGS Hawaiian Volcano Observatory (HVO). All times are Hawaii-Aleutian Standard Time.

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

Activity Summary: Eruptions continue at Kīlauea’s summit and at Puʻu ʻŌʻō in its East Rift Zone. The past 24 hours saw a slight increase in the lava lake level in the summit Overlook Vent, with no significant changes in seismicity or outgassing. There is no lava flow threat to nearby communities.

Summit Observations: The summit lava lake level rose slightly to about 45 meters (145 feet) below the current rim of the Overlook Vent and a slight increase in inflationary tilt was also noted on a summit tiltmeter. Seismicity levels continue to be at low background rates. Summit sulfur dioxide emission rates ranged from 1,500 to 4,300 metric tons per day during the 2-week period ending September 30.

Puʻu ʻŌʻō Observations: Activity continues at Puʻu ʻŌʻō crater, with no significant changes visible on thermal webcam images. The tiltmeter near the crater shows a small amount of deflationary tilt, though its interpretation is complicated by recent rain. The sulfur dioxide emission rate from all East Rift Zone vents was about 400 metric tons per day when measurements were last possible on September 14, 2015.

June 27th Lava Flow Observations: Surface flows are still active within 3 to 7 km (1.9 and 4.3 mi) northeast of Puʻu ʻŌʻō. The lava flow is not currently threatening any communities.



Daily Activity Summary also available by phone: (808) 967-8862

Subscribe to these messages:

Webcam images:


Lava Flow Maps:

Definitions of terms used in update:

Sulfur dioxide emission rate discussion:

Overview of Kīlauea summit (Halemaʻumaʻu) and East Rift Zone (Puʻu ʻŌʻō) eruptions:

Summary of volcanic hazards from Kīlauea eruptions:

Recent Earthquakes in Hawaiʻi (map and list):

Explanation of Volcano Alert Levels and Aviation Color Codes:

Lava viewing information:
Hawaiʻi Volcanoes National Park:

HVO Contact:

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
Thursday, October 1, 2015 10:14 AM PDT (Thursday, October 1, 2015 17:14 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 September 1, 2015 (0000h PST) through September 30, 2015 (2359h PDT):
Mt Shasta: One M1 or greater earthquakes was detected (M1.11).
Medicine Lake: One M1 or greater earthquake was detected (M1.76).
Lassen Volcanic Center: One earthquake of M1.0 or greater was detected (M1.65).
Clear Lake Volcanic Field: One earthquake of M1.0 or greater was detected (M1.64). [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 M3.00].
Long Valley Volcanic Region: In Long Valley Caldera, 9 earthquakes of M1.0 or greater were detected. The largest event registered M3.22. In the Mono Craters region, 17 earthquakes of M1.0 or greater were detected. The largest event was M2.69. Many of these earthquakes occurred during a minor swarm on September 6-7 beneath Mono Lake. No earthquakes of M1.0 or greater were detected under Mammoth Mountain. [Note: The typical high level of seismicity was observed south of the caldera in the Sierra Nevada range. The largest event registered M2.59].
Ubehebe Craters: No earthquakes at or above M1.0 were detected.
Salton Buttes: Five earthquakes of M1.0 or greater were detected. The largest registered M1.76.
Coso Volcanic Field: The typical high level of seismicity was observed, with 13 earthquakes M1.0 or greater. The largest registered M1.91.

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, October 9, 2015 10:15 AM ChST (Friday, October 9, 2015 00:15 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. No activity observed in satellite images during periods of clear weather over the past week.

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.


Other Northern Mariana Islands volcanoes show no signs of significant unrest in satellite data.
Equipment failure on April 3, 2015 resulted in the loss of seismic data from all but one seismic station on Anatahan.
The USGS conducts daily seismic checks on data from one seismic station on Anatahan and one seismic station on Sarigan as well as an infrasound array on Sarigan when data streams are available.

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
Thursday, October 1, 2015 10:13 AM MDT (Thursday, October 1, 2015 16:13 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 September 2015, the University of Utah Seismograph Stations, responsible for the operation and analysis of the Yellowstone Seismic Network, reports that 112 earthquakes were located in the Yellowstone National Park (YNP) region. The largest event was a small earthquake of magnitude 2.2 on September 1, at 03:27 AM MDT, located about 11 miles northeast of Old Faithful, WY.

September 2015 seismicity was characterized by two separate small earthquake swarms

1) A small series of 24 earthquakes occurred September 4. The largest swarm earthquake (magnitude 1.5) occurred September 4, 05:14 AM MDT, located 7 miles south of West Thumb, WY.

2) A small series of 22 earthquakes mostly occurred September 24 and 25th with one event on the 29th. The largest earthquake in the series (magnitude 1.6) occurred September 24, 11:14 PM MDT, located 6 miles north northeast of West Yellowstone, MT.

Yellowstone earthquake activity in September remains at low background levels.

Ground deformation

GPS stations in Yellowstone continue to show little or no ground movement. (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