This report is a listing of those volcanoes that are restless, but not erupting at the moment.
Activity at the volcanoes listed indicate that a potential eruption is possible.

LAST UPDATE: 12 September 2008


BallKliuchevskoiKLIUCHEVSKOI - (56o03' 24"N 160o38' 18"E), 4,835 m, KAMCHATKA (Russia)

As of the 12th of September, the Kamchatkan Volcanic Eruption Response Team (KVERT) has reported that seismic activity of the volcano continues. The activity of the volcano, possibly, could affect international and low-flying aircraft. Seismic activity of the volcano was above background levels all week: a lot of volcanic earthquakes and a continuous volcanic tremor were registered at the volcano all week. According to visual data, the volcano was obscured by clouds last week. According to satellite data, a thermal anomaly was registered over the volcano all week.

Kliuchevskoi is Kamchatka's highest and most active volcano. Since its origin about 6000 years ago, the beautifully symmetrical, 4835-m-high basaltic stratovolcano has produced frequent moderate-volume explosive and effusive eruptions without major periods of inactivity. Kliuchevskoi rises above a saddle NE of sharp-peaked Kamen volcano and lies SE of the broad Ushkovsky massif. More than 100 flank eruptions have occurred at Kliuchevskoi during the past roughly 3000 years, with most lateral craters and cones occurring along radial fissures between the unconfined NE-to-SE flanks of the conical volcano between 500 m and 3600 m elevation. The morphology of its 700-m-wide summit crater has been frequently modified by historical eruptions, which have been recorded since the late-17th century. Historical eruptions have originated primarily from the summit crater, but have also included numerous major explosive and effusive eruptions from flank craters.

The colour code at Kliuchevskoi is currently at YELLOW.

ERUPTION Pro 10.7 is currently forecasting volcano Klichevskoi in Kamchatka (Russia) to erupt in 2008 with >95.0% probability.

BallAnatahanANATAHAN - (16o21' 00"N 145o40' 00"W), 790 m, MARIANA IS.

As of the 7th of August, the USGS has reported that during 30 July-5 August seismic tremor from Anatahan fluctuated. Gas-and-steam plumes possibly containing some ash were occasionally visible on satellite imagery at an altitude of 1.5 km (5,000 ft) a.s.l. and below. Plumes drifted W and NW. The Volcanic Alert Level remained at Watch and the Aviation Colour Code remained at Orange.

The elongate, 9-km-long island of Anatahan in the central Mariana Islands consists of large stratovolcano with a 2.3 x 5 km, E-W-trending compound summit caldera. The larger western caldera is 2.3 x 3 km wide, and its western rim forms the island's 790-m high point. Ponded lava flows overlain by pyroclastic deposits fill the floor of the western caldera, whose SW side is cut by a fresh-looking smaller crater. The 2-km-wide eastern caldera contained a steep-walled inner crater whose floor prior to the 2003 eruption was only 68 m above sea level. Sparseness of vegetation on the most recent lava flows on Anatahan had indicated that they were of Holocene age, but the first historical eruption of Anatahan did not occur until May 2003, when a large explosive eruption took place forming a new crater inside the eastern caldera.

The colour code at Anatahan is currently at ORANGE.

ERUPTION Pro 10.7 is currently forecasting volcano Anatahan in the Mariana Is. to re-erupt in 2008 with >76.81% probability.

BallYellowstoneYELLOWSTONE CALDERA - (44o26'00"N 110o40'00"W), 2,805 m, UNITED STATES (Wyoming)


As of the 3rd of September, the Yellowstone Volcano Observatory (YVO), reported that during the month of August, 146 earthquakes were located in the Yellowstone region. The largest event was a magnitude 2.3 on August 31st at 0731 hours MDT, located about 17 miles west northwest of West Yellowstone, MT. Three swarms occurred during the month of August. The first was a continuation of of a swarm that started July 28th on the Madison Plateau. The swarm continued until August 5th with an additional 52 events with magnitudes from -0.4 to 2.1, bringing the total for the swarm to 184 earthquakes. The second swarm, between Aug 3rd and 7th, included 28 events and was located 16 miles east northeast of West Yellowstone, MT with magnitudes 0.0 to 1.4. The third swarm on August 7th and 8th included 32 events, and was located 6 miles southeast of West Thumb. Magnitudes ranged from 0.0 to 2.1. Earthquake activity in the Yellowstone region is at relatively low background levels.

Ground Deformation Summary: Through August 2008, continuous GPS data show that much of the Yellowstone caldera continued moving upward, though at a lower rate than the past several years. The maximum measured ground uplift over the past 48 months is ~20 cm at the White Lake GPS station. An example can be found at:;=timeseries_plots×eries;=raw
The general uplift of the Yellowstone caldera is scientifically interesting and will continue to be monitored closely by YVO staff.

The colour code at Yellowstone is currently at GREEN.

ERUPTION Pro 10.7 is not capable of forecasting a supervolcano to erupt.

BallMauna LoaMAUNA LOA - (19o28' 30"N 151o36' 30"W), 4,170 m, HAWAII

As of the 2nd of September, the Hawaiian Volcano Observatory (HVO) has reported that Mauna Loa is not erupting. Slow extension, as measured by GPS receivers on opposite sides of the volcano, continued. Tiltmeters have recorded no significant changes other than abrupt offsets that are related to instrumental issues. Sensors within a crack in Moku`aweoweo crater floor continued to record background gas concentrations and temperatures.

Since the beginning of January, 2005, HVO analysts have rarely located more than 10 earthquakes per week beneath Mauna Loa summit. Each week, 1-5 earthquakes are also located beneath the Kealakekua area of west Mauna Loa. These levels are typical of the past several years. The Kao`iki seismic zone between Mauna Loa and Kilauea volcano summits remained active with an average of about 30-50 earthquakes per week; the increase may reflect increased seismic activity nearer Kilauea summit rather than increased Kao`iki activity.

The colour code at Mauna Loa is currently at YELLOW.

ERUPTION Pro 10.7 is currently forecasting volcano Mauna Loa to erupt in 2008 with >21.12% probability.

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