Current Alerts for U.S. Volcanoes

  • 2015-09-03 11:50:50 Cleveland Watch Orange
  • 2015-09-03 05:54:38 Kilauea Watch Orange
  • 2015-09-03 11:50:50 Shishaldin Watch Orange
  • 2015-09-04 09:53:24 Pagan Advisory Yellow
  • 2015-08-28 10:03:23 Cascade Range Normal Green
  • 2015-08-04 14:38:16 Haleakala Normal Green
  • 2015-08-04 14:38:16 Hualalai Normal Green
  • 2015-08-31 14:52:56 Katmai Normal Green
  • 2015-08-04 14:38:16 Mauna Kea Normal Green
  • 2015-08-04 14:38:16 Mauna Loa Normal Green
  • 2015-09-01 11:19:28 Yellowstone Normal Green
  • 2015-08-04 14:38:16 Lo`ihi Unassigned Unassigned

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Thursday, September 3, 2015 11:50 AM PDT (Thursday, September 3, 2015 18:50 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

No activity observed in partly cloudy satellite images and cloudy web camera views over the past day. A few very small earthquakes have occurred in the past 24 hours at the volcano.

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

Low-level eruptive activity within the summit crater of Shishaldin likely continues. The level of seismicity remains above background. No activity was detected in partly cloudy satellite images and cloudy web camera views of Shishaldin over the past day.


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

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, August 28, 2015 10:03 AM PDT (Friday, August 28, 2015 17:03 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: Over the past two weeks, water released from Mount Hood’s White River Glacier has generated sediment-laden streamflow and modest debris flows. The debris flows were detected on several seismometers located near the White River valley.

Such sediment-laden flows are relatively common in the valley after extended periods of hot weather.  This year’s warm temperatures have exposed many areas throughout the Cascades that are typically under snow cover. As a result, periods of increased rainfall in the months ahead may mobilize more sediment off the volcanoes than usual, and muddy streamflows and debris flows may be more frequent.

Fieldwork continues throughout the Cascades; highlights this week include campaign GPS at Mt Baker and gas measurements at Mt Hood.

Mount St. Helens Seismic Information
CVO Alert Archive Search
U.S. Geological Survey
Thursday, September 3, 2015 5:54 AM HST (Thursday, September 3, 2015 15:54 UTC)

This report on the status of Kilauea volcanic activity was prepared by the USGS Hawaiian Volcano Observatory (HVO). All times are Hawai`i 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: The lava lake at Kīlauea's summit remains active. Summit tiltmeters recorded slow deflationary tilt overnight. The East Rift Zone lava flow northeast of Puʻu ʻŌʻō remains active within 8 km (5 mi) of the vent and does not currently pose a threat to communities. Normal levels of seismic activity continue across the volcano.

Summit Observations: The lava lake dropped several meters with deflationary tilt overnight to a level about 60 m (197 ft) below the floor of Halemaʻumaʻu - a drop of about 10 m (33 ft) from yesterday morning's level. Episodic bursts of seismic tremor associated with spattering on the surface of the lava lake continued. Tiltmeters at Kīlauea's summit recorded the start of slow deflationary tilt at about 6 pm yesterday. Weak winds allow the summit gas plume to rise vertically before being blown slowly to the west this morning. Summit sulfur dioxide emission rates ranged from 1,700 to 2,700 metric tons per day for the week ending September 1.

Puʻu ʻŌʻō Observations: Normal activity (continuous gas release and glow at night) continued from vents within the crater. The sulfur dioxide emission rate from all East Rift Zone vents was about 390 metric tons per day when measurements were last possible on August 13, 2015.

June 27th Lava Flow Observations:Clear webcam views yesterday and overnight showed continued scattered activity on the flow field northeast of Puʻu ʻŌʻō. Lava breakouts are active only within about 8 km (5 mi) of Puʻu ʻŌʻō and are not threatening any structures. Some breakouts are marked by smoke plumes where lava is creeping into the forest.


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 Hawaii (map and list):

Explanation of Volcano Alert Levels and Aviation Color Codes:

Lava viewing information:
Hawai`i 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
Wednesday, September 2, 2015 10:04 AM PDT (Wednesday, September 2, 2015 17:04 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 August 1, 2015 (0000h PST) through August 31, 2015 (2359h PDT):
Mt Shasta: No M1 or greater earthquakes were detected.
Medicine Lake: One M1 or greater earthquake was detected (M1.10).
Lassen Volcanic Center: Three earthquakes of M1.0 or greater were detected. The largest registered M2.26.
Clear Lake Volcanic Field: Five earthquakes of M1.0 or greater were detected. The largest registered M2.31. [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 M3.83].
Long Valley Volcanic Region: In Long Valley Caldera, 34 earthquakes of M1.0 or greater were detected. The largest event registered M3.71. In the Mono Craters region, 4 earthquakes of M1.0 or greater were detected. The largest event was M2.09. One earthquake of M1.0 or greater was detected under Mammoth Mountain (M1.11). [Note: The typical high level of seismicity was observed south of the caldera in the Sierra Nevada range. The largest event registered M2.03].
Ubehebe Craters: No earthquakes at or above M1.0 were detected.
Salton Buttes: Twelve earthquakes of M1.0 or greater were detected. The largest registered M1.81.
Coso Volcanic Field: The typical high level of seismicity was observed, with 5 earthquakes M1.0 or greater. The largest registered M1.53.

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, September 4, 2015 9:53 AM PDT (Friday, September 4, 2015 16:53 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.

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.
Data connections that were down following the recent typhoon activity were mostly restored on August 20, 2015, but have been intermittent as infrastructure repairs in the CNMI continue.
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
Tuesday, September 1, 2015 11:19 AM MDT (Tuesday, September 1, 2015 17:19 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 August 2015, the University of Utah Seismograph Stations, responsible for the operation and analysis of the Yellowstone Seismic Network, reports 40 earthquakes were located in the Yellowstone National Park (YNP) region. The largest event was a small earthquake of magnitude 1.9 on August 20, at 03:34 AM MDT, located about 1 mile east-southeast of Lake, WY. No swarm activity occurred during the month of August in the YNP region.

Yellowstone earthquake activity in August remains at low background levels.

Ground deformation

GPS stations in Yellowstone continue to record little or no deformation. (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