Current Alerts for U.S. Volcanoes

  • 2015-08-01 11:53:53 Cleveland Watch Orange
  • 2015-08-01 09:27:56 Kilauea Watch Orange
  • 2015-08-01 11:53:53 Shishaldin Watch Orange
  • 2015-07-31 09:30:36 Pagan Advisory Yellow
  • 2015-07-31 08:30:00 Cascade Range Normal Green
  • 2015-07-14 06:38:19 Haleakala Normal Green
  • 2015-07-14 06:38:19 Hualalai Normal Green
  • 2015-07-28 20:30:09 Iliamna Normal Green
  • 2015-07-14 06:38:19 Mauna Kea Normal Green
  • 2015-07-14 06:38:19 Mauna Loa Normal Green
  • 2015-07-01 10:48:09 Yellowstone Normal Green
  • 2015-07-14 06:38:19 Lo`ihi Unassigned Unassigned

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Saturday, August 1, 2015 11:53 AM PDT (Saturday, August 1, 2015 18:53 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

Elevated surface temperatures were observed in several satellite images over the past day. A field crew working in the area report frequent rockfalls on the volcano.

A weak airwave was detected early this morning, much smaller than last week's explosion. It may be related to gas release at the summit, and is consistent with lava effusion in the summit crater.

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 in the summit crater continues. Seismicity remained above background. Weakly elevated surface temperatures were detected by satellite last night. Yesterday, vigourous steam plumes were seen in satellite images, extending from the volcano's summit to the southwest.


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, July 31, 2015 8:30 AM PDT (Friday, July 31, 2015 15:30 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 systems show that activity at Cascade Range volcanoes remains at background levels. Owing to unusually warm, dry weather this year in the Pacific Northwest, Cascade Range volcanoes have already lost nearly all of their seasonal snowpack, which is atypical for late July. Rockfalls on the volcanoes become increasingly common under such late-summer conditions.

Mount St. Helens Seismic Information
CVO Alert Archive Search
U.S. Geological Survey
Saturday, August 1, 2015 9:27 AM HST (Saturday, August 1, 2015 19:27 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: Inflationary tilt at Kīlauea's summit eased since yesterday as did the rate of increase in lava lake level. The East Rift Zone lava flow remains active northeast of Puʻu ʻŌʻō, but has not advanced significantly and poses no threat to nearby communities. Low levels of seismic activity continue across the volcano.

Summit Observations: Data from Kīlauea's summit tiltmeters shows that the inflationary tilt occurring during the past several days has rounded off. No significant change in summit ground tilt has been recorded since midnight. The lava lake has leveled off its steady rise as well and currently stands about 47 meters from the vent rim and Halema`uma`u crater floor. Seismicity continues at background levels. Summit sulfur dioxide emission rates ranged from 2,600 to 5,500 metric tons/day for the week ending July 28.

Puʻu ʻŌʻō Observations: There was no obvious change in activity at Puʻu ʻŌʻō, which hosts several incandescent, outgassing crater vents. Low levels of background seismicity continue. The sulfur dioxide emission rate from all East Rift Zone vents was about 500 tonnes/day when measurements were last possible on July 23, 2015.

June 27th Lava Flow Observations: Webcam and satellite views show continued activity on the flow field. Active breakouts were scattered across a broad area extending from about 4 to 8 km (2.55 mi) northeast of Puʻu ʻŌʻō. The most distant breakouts are evident by the smoke plumes produced where they are creeping into the forest and burning vegetation along the edge of the flow field.

No boilerplate text for this volcano.

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:

Note about sulfur dioxide emission rate:
(Explains how HVO's method of measuring SO2 changed in 2014 and the effects of that change on reported estimates of emission rates.)


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:

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
Monday, July 6, 2015 12:16 PM PDT (Monday, July 6, 2015 19:16 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 June 1, 2015 (0000h PST) through June 30, 2015 (2359h PDT):
Mt Shasta: Four M1 or greater earthquakes were detected. The largest registered M1.86.
Medicine Lake: One M1 or greater earthquake was detected (M1.41).
Lassen Volcanic Center: Eight earthquakes of M1.0 or greater were detected. The largest registered M1.80. Many of these events occurred during two minor swarms on June 22-23, about 12 km north-northeast of the town of Mineral near the Shasta County-Tehama County boarder and on June 26, about 12 km northeast of the town of Mill Creek.
Clear Lake Volcanic Field: One earthquake of M1.0 or greater was detected, of M1.32. [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 M2.73].
Long Valley Volcanic Region: In Long Valley Caldera, 9 earthquakes of M1.0 or greater were detected. The largest event registered M2.31. In the Mono Craters region, no earthquakes of M1.0 or greater were detected, and 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 M3.15].
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 5 earthquakes of M1.0 or greater. The largest registered M3.31.
Coso Volcanic Field: The typical high level of seismicity was observed, with 11 earthquakes M1.0 or greater. The largest registered M3.31.

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, July 31, 2015 9:30 AM PDT (Friday, July 31, 2015 16:30 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.
Loss of data connections due to recent typhoon activity has prevented the USGS from conducting daily checks of earthquake activity at Sarigan, and Anatahan volcanoes. There is no estimate at present as to how long it will take to restore these connections.

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
Wednesday, July 1, 2015 10:48 AM MDT (Wednesday, July 1, 2015 16:48 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 June 2015, the University of Utah Seismograph Stations, responsible for the operation and analysis of the Yellowstone Seismic Network, reports 82 earthquakes were located in the Yellowstone National Park (YNP) region. The largest event was a small earthquake of magnitude 2.6 on June 21, at 04:40 PM MDT, located about 13 miles north northeast of Old Faithful, WY.

June seismicity included an earthquake swarm occurring on June 13 - 14th, about 6 miles southwest from West Thumb, WY, accounting for 16 earthquakes (ranging in magnitude from -0.1 to 2.4). The largest swarm event was a small earthquake of magnitude 2.4 on June 14, at 01:06 AM MDT.

Yellowstone earthquake activity in June remains at low background levels.

Ground deformation

GPS stations in Yellowstone continue to show little or no ground deformation. See for example: (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