Observations on 29 July 2011 showed a small lava dome ~ 40 m in diameter in the summit crater, apparently formed since 19 July based on measured thermal anomalies. The explosion destroyed the January 2019 lava dome and ejected a large amount of material from the summit crater. Elevated surface temperatures were observed in satellite data along with steam emissions from the summit crater seen in webcam images during periods of clear weather for the first few days of August, and again during 7-8 August. The lava dome observed on 30 January 2013 persisted to the end of this reporting period, September 2013. But these are nothing compared to caldera-forming eruptions. During the other days, clouds prevented satellite observation of Cleveland. | September Pilots flying near the volcano late on 21 February confirmed no further ash production, but one did observe steaming near the termination of a flow on the volcano's SW flank. No current seismic information was available because Cleveland does not have a real-time seismic network. On 4 August satellite images showed a thermal anomaly. Satellite observations showed that the dome surface area increased by about 75%, and covered an area of approximately 2,100 m2 (45 x 50 m) by 4 August. The summit of the volcano has typically had dark deposits on the snow in recent years as we've seen on the webcam, satellite imagery and observer reports so this [was] not conclusive. The Volcanic Alert Level remained at Advisory and the Aviation Color Code remained at Yellow. Because Cleveland is not seismically monitored, the AVO did not assign a level of concern color code.GOES images and animation of the 19 February ash cloud, Sources: US Geological Survey Alaska Volcano Observatory (AVO); Anchorage Volcanic Ash Advisory Center (VAAC); Reuters; Anchorage Daily News. No ashfall was reported at Dutch Harbor, Port Heiden, or Dillingham, however. Minor steaming from the summit was recorded by a webcam during 17-18 June, and slightly elevated surface temperatures were identified in a satellite image acquired on 19 and 20 June. Hours later, a small, short-duration seismic event coupled with satellite data suggested a small ash emission. A strong thermal anomaly over the summit of the volcano was noted on 30 October 2008, but given the low-level nature of the recent activity, AVO did not elevate the Color Code or Alert Level. Seismic and infrasound sensors detected a signal associated with low-level emissions shortly after midnight on 12 November. In response, AVO raised the Aviation Color Code to Orange and the Alert Level to Watch. Cleveland over the last several years.". The first happened on 8 December at 2355 AKST (0855 UTC on 9 December). Des épisodes supplémentaires d’épanchement de lave et d’explosions pourraient se produire sans avertissement préalable. The Volcano Alert Level remained at Watch and the Aviation Color Code remained at Orange. AVO reported that satellite images of Cleveland from 17 August showed that the summit crater was tephra-covered, funnel-shaped, and contained no lava dome. On 7 May, a small ash plume rose to an altitude of below 4.6 km. Observations of weakly-elevated surface temperatures returned 8 and 9 December, with minor steaming at the summit observed on clear days. Ces données, ainsi que les données satellitaires et foudre , devraient permettre à l’AVO de détecter de futures éruptions productrices de cendres. No other activity was noted. On 15 February, a minor explosion from Cleveland produced a small, diffuse ash plume that rose to an altitude of below 3 km and drifted NW. Lava rose to 30 m above the rim, then fell back into the crater. Cleveland since he began flying in the region in 1980. | June Additional assessments of explosive activity in this period were aided by (1) direct observations from mariners or pilots (PIREPS); (2) near real-time recordings of ground-coupled airwaves that characteristically arrive at seismic stations as extremely slow velocity signals, ~1 order of magnitude smaller than typical seismic velocity in the crust (De Angelis and others, 2012); (3) new infrasound detection capabilities recently expanded to include a station on Akutan (~500 km ENE of Cleveland). Minor degassing from the summit was seen in satellite and webcam images during 20-21 August. | September Code couleur actuel de l’aviation: JAUNE. The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Watch. AVO reported that a small explosion from Cleveland was detected at 0112 on 4 April by distant seismic stations and infrasound arrays. As of this date, there is no real-time seismic monitoring network on Mount Cleveland. AVO reported that although cloud cover often prevented observations of Cleveland during 7-12 September, a thermal anomaly on the lava dome was visible during 8-9 and 12 September. A weak thermal anomaly was observed on 1 February 2011, and on 9 February a pilot overflew Cleveland and reported minor, repetitive steam emissions rising hundreds of meters above the summit. A thermal anomaly over the summit was detected on 4 January. There are currently at least 45 volcanoes with ongoing eruptions as of today. Au cours de cette semaine, les enregistrements sismiques du mont Merapi ont montré : The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Watch. The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Watch. The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Watch. A clear view of the crater on 30 August and 1 September revealed thermal anomalies at the summit. On 11 August AVO noted that lava-dome growth had stopped or slowed, based on satellite observations. The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Watch. During 2012-2013, AVO reported that explosions were frequently attributed to dome destruction. The Volcano Alert Level remained at Watch and the Aviation Color Code remained at Orange. Based on analysis of satellite data, on 18 May AVO reported that a small-volume lava dome had erupted in Cleveland's summit crater during the past several days. On 12 August an ash plume rose to an altitude of 7.6 km and drifted 100 km SW. AVO reported that cloud cover prevented satellite and web-camera observations of Cleveland during 1-3 and 5-6 August. AVO reported that unrest at Cleveland continued during 25-31 July, though nothing significant was detected in seismic or infrasound data. AVO continued to monitor the volcano using satellite imagery. No observations of elevated surface temperatures or ash emissions from Cleveland were noted during 15-21 February. Both MODVOLC and AVO use mid-IR data (in the 3.0 to 3.5 micron range) to detect high temperature thermal anomalies. Source: US Geological Survey Alaska Volcano Observatory (AVO), Explosion on 1 June 2020 produced an ash plume and destroyed the January 2019 lava dome. AVO uses MODIS, AVHRR, and GOES satellites to reduce the chance of missing thermal anomalies due to cloud cover. La dernière modification de cette page a été faite le 11 juillet 2020 à 16:19. | December On 30 December, with no new explosive activity, AVO lowered the aviation color code to YELLOW and the alert level to ADVISORY. It reached altitudes of 3-6 km. After this, nothing of note was observed in satellite or webcam images, and no significant activity was detected in seismic or infrasound (air pressure) data until weakly elevated surface temperatures were again detected in satellite data on 25 February. It has produced ash clouds as high as 15,000 and 30,000 feet above sea level. A small explosive eruption of Cleveland on 25 June prompted AVO to raise the Volcano Alert Level to Watch and the Aviation Color Code to Orange. The native name, Chuginadak, refers to the Aleut goddess of fire, who was thought to reside on the volcano. The volcano has been the site of recurrent eruptions througho… The previous Alert Levels were listed as Unassigned. AVO reported that no significant activity at Cleveland was observed in seismic or infrasound data during 4-10 October, though elevated surface temperatures identified in satellite data on 6 October suggested that the lava dome in the summit crater (first noted on 30 September) continued to grow. Explosions were detected at 1123 on 5 May and 0800 on 6 May. Clouds obscured the volcano during 6-11 February, therefore, AVO could not verify that eruptive activity ended and it is possible that the volcano remains in a state of low-level unrest. No ash cloud was observed, though weather clouds obscured views of the volcano. Elevated surface temperatures were identified in satellite images; weather clouds sometimes prevented views of the volcano. Cleveland is 5,675 ft (1,730 m) high, and one of the most active of the 75 or more volcanoes in the larger Aleutian Arc. Dome growth appeared to have paused or ceased by 23 May. Also, around the same time, a ship N of Nikolski on Umnak Island (~ 75 km ENE) reported receiving a dusting of ash (figure 6). The Volcano Alert Level remained at Watch and the Aviation Color Code remained at Orange. The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Watch. Box 757320, Fairbanks, AK 99775-7320, USA, and the Alaska Division of Geological and Geophysical Surveys, 794 University Ave., Suite 200, Fairbanks, AK 99709, USA. and drifted SE. Satellite-based evidence of continuing lava effusion was observed on 7 June but since then surface temperatures had become weaker. On 23 February, satellite imagery revealed a thermal anomaly. L’intensité de la sismicité cette semaine est plus élevée que la semaine dernière. Satellite images from 31 May also showed minor deposits on the upper flanks, and a 1 June image showed debris flow deposits down the E flank and ashfall deposits on the SW flank. The Level of Concern Color Code remained at Orange and the Volcano Alert Level remained at Watch. Calabozos and neighbours (Chile) This volcano is located in Chile. Low-level steam plumes and minor degassing were observed a number of times during August. A small ash cloud drifted SW at or below 4.6 km (15,000 ft) a.s.l. Three small SO2 clouds produced by small explosions on 20 July were detected in OMI satellite data provided by the University of Maryland Baltimore County. Table 6. The Volcano Alert Level and the Aviation Color Code were lowered to Unassigned. This report first addresses late 2011 to early 2012 observations, and then presents some amendments to Bulletin reports over the last decade. The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Watch. 2018: January 18 Décembre 2020. Niveau d’alerte volcanique actuel: ATTENTION Niveau d’alerte volcan précédent: NON ASSIGNÉ Code couleur actuel de l’aviation: ORANGE Code couleur de l’aviation précédent: NON ASSIGNÉ. Images revealed nothing unusual during 20-22 July. The thermal anomaly continued to be detected during 26-28 July and possible ash plumes drifted SE, E, and NE at altitudes of 3-6.1 km (10,000-20,000 ft) a.s.l. June 06 , 2020. AVO reported that cloudy conditions at Cleveland often prevented observations during 4-9 July. Indonésie : Merapi , Russie / Iles Kuriles : Ebeko , Ile de Guadeloupe : La Soufrière , Costa Rica : Turrialba / Poas / Rincon de la Vieja / Irazu . Elevated temperatures in mid-January 2013 were followed by observations of a new lava dome that measured 100 m in diameter on 30 January 2013, and a second lava extrusion on 9 February. AVO reported that unrest at Cleveland continued during 20-24 February, though no activity was detected in seismic or infrasound data. The Anchorage VAAC reported that additional eruptions occurred through 1800. a?e Examples of short-term (less than a few months) and longer-term (*1 year) InSAR images. of Hawai'i, 2525 Correa Road, Honolulu, HI 96822, USA (URL: http://modis.higp.hawaii.edu/); MIROVA (Middle InfraRed Observation of Volcanic Activity), a collaborative project between the Universities of Turin and Florence (Italy) supported by the Centre for Volcanic Risk of the Italian Civil Protection Department (URL: http://www.mirovaweb.it/); NASA Earth Observatory, EOS Project Science Office, NASA Goddard Space Flight Center, Goddard, Maryland, USA (URL: http://earthobservatory.nasa.gov/). During 10-11 February, a feeble thermal anomaly was marginally visible on satellite imagery. The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Watch. During 4-5 May two small explosions were detected. Observations on 2 August revealed growth of the lava dome from ~40 to 50 m in diameter. 1. No further explosive activity had been detected by the OMI sensor since that time. An explosion on 9 January 2019 was followed by lava dome growth observed during 12-16 January. The Volcano Alert Level remained at Watch and the Aviation Color Code remained at Orange. No level of concern color codes were assigned for Cleveland because AVO has no seismic monitoring stations at the volcano. Also shown are Volcano Alert Level and Aviation Color Code fluctuations based on that activity. In the previous Bulletin report (BGVN 37:01) we discussed a cycle of lava-dome growth within the summit crater from late 2011 through early 2012. Mount Cleveland is one of the most active volcanoes in the Aleutian Arc, having erupted an estimated 22 times in the last 230 years. . /// Photograph courtesy of @nasa. AVO reported that a short-lived explosion at Cleveland was detected in both seismic and infrasound data at 1938 on 16 May; the seismic signal lasted about 11 minutes. AVO noted that these observations were consistent with the presence of an active lava dome. No current seismic information was available because Cleveland does not have a real-time seismic network. The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Watch. | March AVO again raised the Volcano Alert Level to Watch and the Aviation Color Code to Orange. of Hawai'i, 2525 Correa Road, Honolulu, HI 96822, USA (URL: http://modis.higp.hawaii.edu/). No current seismic information was available because Cleveland does not have a real-time seismic network. De plus, 453 minutes de tremors ont été enregistrées. AVO reported that during 22-23 May elevated surface temperatures over Cleveland were observed in satellite images. Satellite observations were obscured by clouds during 8-10 April. The Concern Color Code was raised to Yellow. But these are nothing compared to caldera-forming eruptions. AVO reported that on 4 May the infrasound network detected three short-duration explosions from Cleveland at 0500, 0717, and 1144. No current seismic information was available because Cleveland does not have a real-time seismic network. Seismic and infrasound data were at background levels. The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Watch. This was followed by slightly to moderately elevated surface temperatures occasionally observed in satellite imagery through the end of the month. | August The ash cloud on 4 April rose to 4.6 km altitude and drifted SW; hot material was ejected onto the W flank. More on elevated surface temperatures during 2012-2013. Seismic and infrasound data on explosions often provide valuable information. It has produced ash clouds as high as 15,000 and 30,000 feet above sea level. Information Contacts: Alaska Volcano Observatory (AVO), a cooperative program of the U.S. Geological Survey, 4200 University Drive, Anchorage, AK 99508-4667, USA, the Geophysical Institute, University of Alaska, PO Box 757320, Fairbanks, AK 99775-7320, USA, and the Alaska Division of Geological & Geophysical Surveys, 794 University Ave., Suite 200, Fairbanks, AK 99709, USA (URL: http://www.avo.alaska.edu/); Volcanic Emissions Group, Ozone Monitoring Instrument (OMI)-Total Ozone Monitoring Spectrometer (TOMS), Joint Center for Earth Systems Technology, University of Maryland Baltimore County (UMBC), and NASA Goddard Space Flight Center (URL: http://toms.unbc.edu/). The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Watch. The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Watch. Italy : Stromboli , Costa Rica : Turrialba / Poas / Rincon de la Vieja , Japan : Sakurajima (Aira) , Hawaii : Kilauea . Élévation du sommet : 13681 pi (4170 m) We amend some of our previous Bulletin reports with the following excerpts from USGS reports of Cleveland eruptions since 2001, ending with the last Bulletin containing a report on Cleveland (BGVN 36:08). Satellite views of the volcano were obscured by clouds for most of the time; elevated surface temperatures were observed in satellite data a few times in the last few days of October and during the first half of November; there were no observations of activity in mostly cloudy satellite images at the end of November. An unobscured satellite view on 10 September (figure 27) showed the first evidence of an emplaced lava dome within the crater. Very small-scale maps (such as world maps) are not included. Sources: US Geological Survey Alaska Volcano Observatory (AVO); OMI Sulfur Dioxide Group. The eruption was unconfirmed by satellite data. Accordingly, even during times of perceived quiet there is an absence of definitive information that activity level is at background. A small explosion was detected on 17 August by seismic and infrasound instruments on neighboring volcanoes. The event produced a small ash cloud that rose as high as 6.7 km (22,000 ft) a.s.l. Les informations de déformation du G. Merapi surveillées par EDM et GPS cette semaine n’ont pas montré de changements significatifs. Elevated surface temperatures were detected during 28-30 June, and webcam images from 29 June showed fresh ash deposits at the summit. Néanmoins, la surveillance du Cleveland se poursuit avec des stations sismiques et infrasons régionales sur les îles voisines. There were also minor ash emissions from July to October 2005 (BGVN 30:09). Elevated surface temperatures were detected in satellite imagery during 21-24 November. Lava flow and ash emission from summit crater. Following a brief ash burst on 7 October, no further ash emissions were noted. Observations in early December 2011 showed continued deflation and cooling of the lava dome, which was about 1x106 m3 in volume. Data extracted from AVO reports. AVO reported that elevated surface temperatures from Cleveland were detected in satellite images during 18-20 July. It has produced ash clouds as high as 15,000 and 30,000 feet, which can pose hazards to … AVO reported that during 12-15 February elevated surface temperatures from Cleveland's lava dome were detected in satellite images. Summary of activity during June 2014-February 2017. A low-level steam-and-gas plume emanated from the summit on 24 February, and again was identified in multiple satellite images on 28 February. The second, which had a higher peak seismic amplitude, occurred on 12 December at 1153 AKST (2053 UTC). Mount Cleveland (also known as Cleveland Volcano) is a nearly symmetrical stratovolcano on the western end of Chuginadak Island, which is part of the Islands of Four Mountains just west of Umnak Island in the Fox Islands of the Aleutian Islands of Alaska.Mt. No activity was observed in satellite images nor detected by the seismic and infrasound networks during 6-8 May. The last eruption was on June 2, 2020, just this year,” Power said. The Volcanic Alert Level remained at Watch and the Aviation Color Code remained at Orange. Based on satellite data, a small eruption occurred at Cleveland sometime before 0300. The Volcano Alert Level remained at Watch and the Aviation Color Code remained at Orange. Dome growth had occurred with no detectable seismicity. The thermal anomaly continued to be detected on satellite imagery during 22-23 July. AVO reported that during 23-29 September low-level unrest at Cleveland likely continued. Cleveland has a history of frequent, minor ash emissions particularly during 2005-2009 (McGimsey and others, 2007; Neal and others, 2011) and with more frequency during 2011-2013 (Guffanti and Miller, 2013; De Angelis and others, 2012). Small low-frequency earthquakes were detected on 6 June and elevated surface temperatures were observed in night-time satellite images on 7 June. Slightly elevated surface temperatures were recorded at the summit during the first week of August 2015. Dehn was "pretty confident that this [was] real but the signal is comparable to weather systems. Strongly elevated surface temperatures suggestive of lava effusion were noted in satellite data through 18 August, and weakly elevated temperatures were recorded for the rest of August and September. Cleveland volcano (Aleutian Islands, Alaska): AVO weekly update . Occasional clear web camera views of the summit showed slight steam emissions. 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