Elevated surface temperatures identified in satellite images during 6-7 June were consistent with lava effusion at the summit crater. Indonesia : Merapi , Russia / Kurile Islands : Ebeko , Island of Guadeloupe : La Soufrière , Costa Rica : Turrialba / Poas / Rincon de la Vieja / Irazu . AVO reported that a small lava dome in Cleveland's summit crater first observed on 18 May had grown to about 60 m in diameter, though it had not changed since 23 May. The MIROVA infrared data suggests ongoing thermal anomalies from late May through September 2016 (figure 19). Elevated surface temperatures were intermittently observed until the next ash explosion on 4 May 2013, which was followed by a larger series of explosions on 6 May that filled the crater with tephra and created flowage deposits on the NE, E, and SE flanks. NXT ADVISORY: WILL BE ISSUED BY 20200602/1426Z JAM/CML JUN 2020 AAWU. Elevated surface temperatures were identified in satellite images; weather clouds sometimes prevented views of the volcano. Courtesy AVO. On 24-25 September 2011 elevated surface temperatures were absent in several clear satellite images. Cleveland lacks a real-time seismic network, which means AVO cannot track local earthquakes and estimate volcanic unrest. ASH FALL ALERTS Ted Stevens Airport Flight Status (Anchorage) Ashfall collection instructions USGS Ashfall Preparedness website IS ASH FALLING? Pilot Harold Wilson (Peninsula Airways) observed Mt. AVO reported that during 1-4 and 6-7 March slightly elevated surface temperatures were identified in satellite images of Cleveland, along with minor steaming from the summit visible in clear webcam images during 1-3 March. Sentinel-2 thermal satellite imagery highlights both gas-and-steam emissions and these higher surface temperatures near the summit crater (figure 34). Cloud cover prevented satellite observations during 13-26 August, although a possible thermal anomaly was present on 24 August. The Aviation Color Code was raised to Orange and the Volcano Alert Level was raised to Watch. The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Watch. Observations in early December 2011 showed continued deflation and cooling of the lava dome, which was about 1x106 m3 in volume. Also shown are Volcano Alert Level and Aviation Color Code fluctuations based on that activity. Clouds obscured views during 24-26 May. At 1700, an image showed the detached ash plume 130 km SW of Cleveland. No further activity was recorded. Although satellite images did not detect ash it was possible the explosion generated minor ash emissions. Due to the declining activity and indications that lave effusion likely had stopped, AVO lowered the Level of Concern Color Code to Yellow and the Volcano Alert Level to Advisory on 14 October. AVO raised the Level of Concern Color Code to Orange and the Volcano Alert Level to Watch. AVO reported that elevated surface temperatures from Cleveland were detected in satellite images during 18-20 July. Small explosions in mid-December 2017 were followed by elevated surface temperatures later in the month and a lava flow in the summit crater that began effusing on 5 January 2018 (table 9). Weakly elevated surface temperatures detected in satellite images during 25-26 May were consistent with the presence of the new lava dome. Cleveland volcano is monitored with a limited real-time seismic network, which inhibits AVO's ability to detect precursory unrest that may lead to an explosive eruption. On 30 December, with no new explosive activity, AVO lowered the aviation color code to YELLOW and the alert level to ADVISORY. The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Watch. 2008 Volcanic activity in Alaska, Kamchatka, and the Kurile Islands: Summary of events and response of the Alaska Volcano Observatory: U.S. Geological Survey Scientific Investigations Report 2010-5243, 94 p., available at http://pubs.usgs.gov/sir/2010/5243. ", Dehn went on to note that "Cleveland is known for these small events, and whether we catch them is up to the fortuitousness of a satellite pass and good weather. From more than 100 km away at about 1100, pilot Charles Nickerson (Reeve Aleutian Airways) reported that the plume, which appeared to be drifting WNW, reached 9-10.6 km altitude with about a 25 km upper radius, but the plume was by then apparently detached from its origin and the volcano that fed it is not certain. Small explosions on 28 and 30 October partly destroyed the lava dome. Alaska's volcanoes, northern link in the ring of fire. Another explosion was reported on 2 March with a plume rising to 4.6 km altitude and drifting ENE. Ashfall from 21 May eruption observed on the NE flank. Les données sismiques, infrasons et caméras Web locales n’étaient pas disponibles en raison d’une panne d’équipement dans une installation distante. Later that day AVO received pilot reports of an ash plume that rose to an altitude of 6.1 km (20,000 ft) a.s.l. No significant volcanic activity was noted in often cloudy satellite views during 2-9 June; a steam plume was visible on 3 June. Thermal anomalies ("alerts") at Cleveland registered by the MODIS satellite as processed by the MODVOLC algorithm during the interval 1 January-9 September 2008. AVO reported that no further activity at Cleveland had been detected after three brief explosions on 28 and 30 December, and 2 January; satellite images suggested no new lava effusion. AVO reported an explosion at Cleveland at 1058 on 16 April was detected by both infrasound (air pressure) and seismic data. The Washington Volcanic Ash Advisory Center (VAAC) issued advisories for both eruptions based on information from GOES-10 infrared and multi-spectral imagery (figure 4). On 23 October, a TerraSAR-X satellite radar image of Cleveland showed no discernable growth in the lava dome over the course of the past several weeks. AVO reported that unrest at Cleveland continued during 31 January-6 February, though nothing significant was detected in seismic or infrasound data. AVO reported that analysis of recent satellite data suggested that the lava dome in Cleveland’s summit crater first observed on 12 January may have stopped growing on 16 January, and since then the center of the dome slowly subsided. Slightly elevated surface temperatures again appeared in a satellite view on 18 April. During 16 and 21-23 October satellite data showed moderately elevated surface temperatures and a small steam plume was visible in web camera images. No current seismic information was available because Cleveland does not have a real-time seismic network. Additional explosions were reported by AVO through July 2013. Conditions were mostly cloudy for the remainder of December; occasional clear satellite views showed no further temperature anomalies. During 17-18 September a thermal anomaly was detected in imagery. No current seismic information was available because Cleveland does not have a real-time seismic network. This report discusses subsequent behavior and observations into late August, including thermal anomalies, explosions, ash plumes, and an inferred lava flow. | October The Aviation Color Code remained at Yellow and the Volcano Alert Level remained at Advisory. Note that the absence of observable activity from satellites is often due to cloud cover. On the morning of 2 May beginning at 0101, a thermal anomaly and continuous plume from Cleveland were seen on satellite imagery. AVO reported weak thermal anomalies in satellite imagery during 2-3, 5, 7-9, and 13-14 August when cloud cover was limited or absent. During 4-5 May two small explosions were detected. /// Photograph courtesy of @nasa. This level of activity -accompanied by persistent thermal anomalies - occurred throughout the spring and early summer. No other activity was detected during 11-13 March. The Volcano Alert Level remained at Watch and the Aviation Color Code remained at Orange. Thermal anomalies and other signs of unrest continued through 24 February, when a small explosion was detected. On 12 February, the Volcanic Alert Level was lowered back to Advisory and the Aviation Color Code was lowered to Yellow. After 10 days of diminished activity following the sequence of explosions in December, AVO reduced the Aviation Color Code to Yellow and the Volcano Alert Level to Advisory on 7 January 2019. Reference. Information Contacts: Alaska Volcano Observatory (AVO), a cooperative program of a) U.S. Geological Survey, 4200 University Drive, Anchorage, AK 99508-4667, USA (URL: http://www.avo.alaska.edu/), b) Geophysical Institute, University of Alaska, PO Box 757320, Fairbanks, AK 99775-7320, USA, and c) Alaska Division of Geological & Geophysical Surveys, 794 University Ave., Suite 200, Fairbanks, AK 99709, USA; USAToday (URL: http://www.usatoday.com). AVO reported that at 0817 on 21 July an explosion at Cleveland was detected in both infrasound and seismic data. 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, and a possible anomaly was visible on 10 September. . On 9 August AVO reported that possible thermal anomalies on Cleveland were detected in satellite imagery. Table 2. at about 0235, Heyden observed a crater ~60 m in diameter on the upper ESE flank. As a prelude to this section, table 4 lists Cleveland eruptions reported by the AVO during 2001-2012 and the issues of the Bulletin covering a particular event. AVO interpreted the thermal anomaly to indicate that unrest was continuing at Cleveland and that further explosive activity could occur at anytime. A subsequent satellite image indicated that hot material ejected from the event was deposited on the W flank, possibly reaching the coastline. AVO reported that elevated surface temperatures in satellite images were periodically detected over Cleveland during 26 August-1 September. Thermal anomalies were again seen on 15 and 28 April using Suomi NPP/VIIRS sensor data. Low-level pulses of volcanic tremor were detected several times during the week by an AVO seismic network 230 km to the E of the volcano. Elevated surface temperatures were observed in satellite images during 23-24 September, suggesting that the lava dome eruption was continuing. Small steam plumes were seen in webcam views during 22- 24 October. Cloud cover prevented observations on 26 September. Clouds obscured satellite and web camera views of Cleveland volcano during 15-20 August. Miller, T.P., McGimsey, R.G., Richter, D.H., Riehle, J.R., Nye, C.J., Yount, M.E. AVO reported that during 7-13 October no activity at Cleveland was detected in satellite and webcam images. The Volcanic Alert Level remained at Watch and the Aviation Color Code remained at Orange. A MIROVA thermal anomaly signal reappeared around 25 December. | May AVO reported that two small explosions at Cleveland were detected at 0516 and 0558 on 28 September in infrasound and seismic data. Stratovolcanoes Carlisle, Cleveland, Herbert, Kagamil, Tana and Uliag (also known as the Islands of the Four Mountains) rest in a tight cluster close to the center of the chain of islands. The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Watch. Very small-scale maps (such as world maps) are not included. A small explosion occurred on 6 August at 2203 AKDT, but no ash cloud was identified. AVO reported that observations from 2 August of the lava dome growing in Cleveland's summit crater revealed growth from about 40 m to 50 m in diameter since 29 July. The last eruptive activity at Cleveland Volcano was a short-lived explosion on the evening (local time) of June 1, 2020. On 26 May AVO downgraded the Concern Color Code from Yellow to "Not Assigned". They noted that a scientist flying N of the volcano on 14 August observed small white puffs of steam rising 30-60 m above the summit, even though most of the volcano was obscured by clouds. On 15, 27, and 30 March, weak thermal anomalies were detected. The cloud was at an altitude of about 7.6 km (25,000 ft) a.s.l., had moved about 140 km SW, and rapidly dissipated. A new explosion on 24 October 2016 destroyed the dome emplaced in May; satellite views in November showed a deep pit within the summit crater. The Volcanic Alert Level was lowered to Advisory and the Aviation Color Code was lowered to Yellow. Summary of activity during June 2014-February 2017. The Aviation Color Code remained at Yellow and the Volcano Alert Level remained at Advisory. No current seismic information was available because Cleveland does not have a real-time seismic network. The AVO reported that no further eruptive activity was observed or detected at Cleveland since the 19 February eruption. 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