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Augustine is the most active volcano of the eastern Aleutian arc. It consists of several overlapping lava domes that frequently produce explosive eruptions and are notorious for collapsing, producing glowing avalanches (block and ash flows).
Augustine volcano had a devastating eruption 1883 when large parts of the summit dome complex collapsed. In the following century, several eruptions associated with dome growth have restored the volcano's height again. Historical eruptions after that date were typically explosive, producing pyroclastic pumice flows and block-and-ash flows, followed by regrowth of the lava domes.
Stratovolcano 1260 m / 4134 ft
Cook Inlet (SW Alaska), 59.36°N / -153.43°W
Current status: normal or dormant (1 out of 5)
Augustine webcams / live data | ReportsAugustine volcano books
Augustine volcano eruptions:
2005-06, 1986, 1976, 1971, 1963, 1935, 1908(?), 1883-84(?), 1812
Typical eruption style:Explosive
Last earthquakes nearby
Latest satellite images
Augustine volcano news & activity updates:
Thu, 16 Oct 2014, 08:25
Strong ash emissions from the volcano were reported by a pilot shortly after midnight (UTC). The reported height of the plume was to up to 70,000 ft (21 km) altitude, which would indicate an unexpected, and sudden major explosion took place (if the observed plume was volcanic ash and not something else). Anchorage VAAC raised the Aviation Color Code to RED. ...moreNo ash could be identified on satellite imagery, and the Alaska Volcano Observatory (AVO) has not issued any comment. In a subsequent VAAC, "ash emissions have ended", Anchorage wrote. It seems likely an unusual weather cloud had been mistaken for a volcanic plume. [ less]
Thu, 27 Sep 2007, 19:26
AVO increased the Volcanic Alert Level to Advisory and the Aviation Color Code to Yellow for Augustine on 22 September due to an increase in seismic activity below the summit over the previous week. ...moreDuring 22-25 September, the earthquakes were generally less than M 1 and were located at shallow depths beneath the summit. [ less]
Wed, 26 Apr 2006, 13:35
The eruption at Augustine may be approaching its end. Activity at Augustine declined to low levels during 7-14 April, with seismicity decreasing to slightly above background levels, and rockfalls and avalanches decreasing in frequency in comparison to previous weeks. Low-level eruptive activity continued, consisting of slow effusion of lava at the summit accompanied by small rockfalls and avalanches on the volcano's flanks. Satellite imagery showed a decline in thermal output consistent with the decreased activity. Sulfur-dioxide gas measurements showed continued high levels of magmatic gas emissions that may have been associated with degassing of lava at the summit of the volcano. Augustine remained at Concern Color Code Orange.
Thu, 6 Apr 2006, 08:25
Low-level eruptive activity continues at Augustine volcano, with no significant changes. There are occasional hot block-and-ash flows, rock avalanches, rockfalls, and lava flows. Small and dilute ash clouds resulting from this activity is most likely confined to the immediate vicinity of the volcano. Satellite imagery continued to show a thermal anomaly related to the new lava dome and lava flow. Augustine remains at Concern Color Orange. -->More on Augustine volcano ...more
Tue, 21 Mar 2006, 21:18
Low-level eruptive activity continues at Augustine Volcano. Changes in seismic signal characteristics as well as visual obsrevation suggest that Augustine is entering a phase of steady and slower effusion of lava, with intermittent block-and-ash-flows, rock avalanches, and rock falls from the summit lava dome. The webcameras from AVO captured numerous hot avalanches and prolonged periods of incandescence in the summit area and on the upper northeast flank on several evenings. Satellite images show that thermal anomalies persist. Observations made on overflights of the volcano this week indicate that the two lava flows on the north and northeast flanks continue to advance slowly. Occasional collapses of the lava flow fronts shed hot blocks and produce minor ash emissions. Estimates using photographs indicate that the new lava dome is about 70 m higher than the level of the lava dome formed in 1986. ...more [ read all]
Tue, 7 Mar 2006, 18:27
Low-level eruptive activity continues at Augustine volcano. Seismicity has increased slightly since Saturday as AVO reports. Minor ash emissions continue intermittently, producing only very minor ash plumes that do not travel far from the island. Rockfalls and small avalanches from the summit area continue to be recorded.
...more
Sat, 25 Feb 2006, 13:06
No significant changes at Augustine. The eruption is waning, seismicity decreasing and emissions of ash as well as incandescent rock falls from the lava dome are becoming more and more infrequent.
Mon, 20 Feb 2006, 12:06
Activity at Augustine Volcano continues at low levels. Rockfalls and avalanches from the lava dome continue to be recorded by AVO seismic stations. Occasional small explosions produce small plumes of steam and ash. Satellite views of the volcano show a persistent thermal anomaly in the summit area, consistent with the location of the lava dome.
Fri, 17 Feb 2006, 11:28
The eruption at Augustine has been slowing down although seismic activity is still above average values and the growth of the lava dome continues slowly. Occasional rockfalls from the lava dome and small resulting pyroclastic flows occur, but their number is descreasing, suggesting that the rate of lava effusion is slowing.. ...moreSatellite views of Augustine showed a strong thermal anomaly in the summit crater area. No new ash emission from Augustine seem to have occurred since February 13. AVO judges that brief, energetic explosions could still occur with little or no warning. Such explosions could produce larger amounts of ash leading to the formation of drifting ash clouds that could rise more than 25,000 feet above sea level. Based on all available data, AVO believes that dome building eruptive activity will continue over the next few days or weeks and may continue intermittently over the next several months. --- Source: AVO
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Thu, 9 Feb 2006, 09:05
The eruption at Augustine volcano has clamed down a bit, but continues with occasional ash eruptions, some of which produce small pyroclastic flows that travel down down Augustine's flanks. The highest ash plumes reached about 5 km a.s.l. (15,000 ft) a.s.l. AVO warns that further explosive activity producing ash clouds to heights over 7.6 km (25,000 ft) may still occur with little or no warning. Augustine remained at Concern Color Code Orange.
Show more news
Wed, 18 Jan 2006, 00:12
After several smaller explosions similar to the initial ones during the past days, Augustine Volcano seems to become even more active. Tuesday morning, an eruption produced an ash plume that reached 8 1/2 miles (ca. 13 km) height above sea level.
Fri, 13 Jan 2006, 23:45
Augustine volcano emitting ash on 12 Jan. 2006, photographed from the west. (Photo: Game McGimsey/Alaska Volcano Observatory/U.S.G.S.) Two more explosions occurred from Augustine volcano on Jan. 12, 2006, producing ash plumes that rose to up to 5 miles (ca. 8 km) above sea level.
Fri, 13 Jan 2006, 10:39
Augustine volcano has calmed down a bit, and the USGS lowered the alert level from RED to ORANGE. Seismic activity has declined since yesterday’s eruption but remains elevated above background and the volcano continues to steam vigorously. AVO reports steam and minor ash emissions from a new vent on the 1986 lava dome, producing a plume reaching an estimated height of 8000 to 10,000 ft (2400 to 3050 m) above sea level. Field observataions confirmed mudflows (also visible in the on-island web camera) on the flanks of the volcano. These flows are the likely source of false reports of new lava flows on the volcano. ...more
Wed, 11 Jan 2006, 16:18
In this photo from the Alaska Volcano Observatory's Augustine Island webcam, steam rises from Augustine Volcano 75 miles southwest of Homer, Alaska, Thursday Jan. 12, following its more powerful explosion at night 2006. (AP Photo/Alaska Volcano Observatory ) Update: according to news sources, the eruption DID take place and an ash plume rose to a reported height of about 5 miles (8 km) into the sky. A weather service flight advisory was issued for pilots for an area 20 miles east and west of the volcano and about 50 miles north. As the AVO reports a few minutes ago, "at 4:44 a.m. (AST) this morning, AVO began recording seismic signals interpreted as explosions at the summit of Augustine Volcano that likely mark the onset of an eruption. The current activity may be emitting ash, steam, and volcanic gases." The color code for Augustine has been raised to RED. For more details and current information, please visit the Augustine page at the AVO.
Sat, 26 Feb 2005, 01:49
Augustine volcano seen from the air on 4 January, 2006 (photo courtesy: G. McGimsey, USGS-AVO) Augustine volcano, Alaska, is showing more and more unrest and the Alaskan Volcan Observatory announced an increase of alert level to ORANGE, which means that an eruption is considered possible within a short time. ...moreSince May 2005, seismic activity at Augustine has been gradually increasing. The increase in earthquakes located directly under the summit of the volcano has also been accompanied by a detectable swelling (up to a total of 5 cm as in early Jan) of the volcano. In early and mid December, a number of small steam explosions were recorded by seismic instruments on the volcano. Views of the summit following these explosions revealed new steaming cracks and localized deposits of debris. In addition, airborne gas measurements and thermal imaging measurements have shown an increase in the output of volcanic gas and heat at the summit of the volcano. The highest temperature recorded, on January 4, was 390 C (750 F). AVO interprets these changes as a sign that new magma is accumulating beneath the volcano's summit. Based on an analysis of past and current earthquake locations, GPS, gas, and heat data, this new magma may have risen to sea level or higher. --- Source: adapted from information on the AVO's website (11 Jan).
From the same source, citation: << [ less] [ read all]
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