OREGON STATE UNIVERSITY

GVP Eruption Reports

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The Weekly Volcanic Activity Report is a cooperative project between the Smithsonian's Global Volcanism Program and the US Geological Survey's Volcano Hazards Program. Updated by 2300 UTC every Wednesday, these notices are preliminary and subject to change as events are studied in more detail. This is not a comprehensive list of eruptions during the week, but rather a summary of activity that meet selected criteria. Carefully reviewed, detailed reports are published monthly in the Bulletin of the Global Volcanism Network. The World Organization of Volcano Observatories (WOVO) website (http://www.wovo.org/) lists the regional volcano observatories that have the most authoritative data for many of these events.
Updated: 5 hours 55 min ago

Rincon de la Vieja (Costa Rica) - Report for 17 September-23 September 2014 - NEW

Tue, 09/23/2014 - 8:10am

OVSICORI-UNA reported that at 1237 on 17 September a seismic signal indicating a phreatic explosion at Rincón de la Vieja was detected by a station about 5 km S of the volcano. A second phreatic explosion, detected at 2048 and lasting three minutes, was of a larger magnitude and a longer duration that the first explosion. Phreatic explosions were also detected at 1825 on 19 September and at 0304, 0439, and 0634 on 20 September. Residents on the N flank heard the event on 19 September and saw the explosion at 0634 on 20 September. An overflight of the crater lake on 20 September revealed that the temperature of the lake water was about 45 degrees Celsius, an increase from about 30 degrees measured in April.

Source: Observatorio Vulcanologico y Sismologico de Costa Rica-Universidad Nacional (OVSICORI-UNA)

Slamet (Indonesia) - Report for 17 September-23 September 2014 - NEW

Tue, 09/23/2014 - 8:10am

PVMBG reported that during 13-16 September white plumes rose 50-200 m above Slamet's crater. An explosion on 17 September produced a dense blackish-gray ash plume that rose as high as 1.2 km and drifted S and SW. Incandescent material was ejected 200-500 m high and booming noises were reported. Ash fell in areas as far as 20 km S. Although white plumes mostly rose from the crater the next day, an explosion generated an ash plume that rose 500 m and drifted W. During 19-20 September white plumes rose 100 m. The Alert Level remained at 3 (on a scale of 1-4).

Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)

Karangetang [Api Siau] (Indonesia) - Report for 17 September-23 September 2014

Tue, 09/23/2014 - 8:10am

PVMBG reported that although Karangetang was often covered in fog during 7-14 September, observers occasionally noted white plumes rising at most 150 m from the main crater and Crater II. Incandescence from the lava dome was observed at night. Seismicity remained high and was dominated by shallow earthquakes from lava-dome growth and avalanches. The Alert Level remained at 3 (on a scale of 1-4).

Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)

Lokon-Empung (Indonesia) - Report for 17 September-23 September 2014

Tue, 09/23/2014 - 8:10am

PVMBG reported that during 8-14 September observers of Lokon-Empung noted white plumes rising 25-100 m above Tompaluan Crater. On 13 September three explosions from Tompaluan Crater, at 0300, 1146, and 1229, produced white plumes that rose at most 500 m above the crater. Seismicity decreased sharply after the13 September events but continued to remain high relative to the levels detected prior to 10 September. The Alert Level remained at 3 (on a scale of 1-4).

Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)

Sinabung (Indonesia) - Report for 17 September-23 September 2014

Tue, 09/23/2014 - 8:10am

PVMBG reported that RSAM values from Sinabung were low and stable during 12-20 September. Earthquake signals indicating lava-dome instability were recorded and had increased from 96 to 110 events/day since the 5-11 September period. Seismicity also continued to signify growth of the main lava flow on the flanks; incandescent lava was visible at the top, middle, and front of the lava flow. The length of the lava flow was 2.9 km on 6 September. White and sometimes bluish plumes rose as high as 1 km above the lava dome. Pyroclastic flows traveled 2.5 km SE on 15 September and 2 km S on 18 September. The Alert Level remained at 3 (on a scale of 1-4).

Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)

Bardarbunga (Iceland) - Report for 17 September-23 September 2014 - NEW

Tue, 09/23/2014 - 8:10am

During 17-23 September, IMO maintained Aviation Colour Code Orange due to continued activity at Bárdarbunga’s Holuhraun eruptive fissure. Chemical analysis and geophysical modeling indicated that the source of the magma was at a depth of more than 10 km. Persistent subsidence was detected from the Bárdarbunga caldera and crustal movements signified that the volume of magma in the dyke slightly increased. On 21 September the lava field measured 37 square kilometers. Field scientists estimated that about 90% of the sulfur dioxide gas from the eruption originated at the active craters and the rest rose from the lava field. Dead birds were also found around the eruption site. A report on 22 September noted that the total volume of the erupted lava was 0.4-0.6 cubic kilometers and the flow rate was 250-350 cubic meters per second. Persistent subsidence was detected from the Bárdarbunga caldera; the volume of the depression was an estimated 0.6 cubic kilometers on 23 September.

Source: Icelandic Met Office

Rabaul (Papua New Guinea) - Report for 17 September-23 September 2014 - NEW

Tue, 09/23/2014 - 8:10am

RVO reported that Rabaul caldera's Tavurvur cone was mostly quiet during 13-19 September. Variable amounts of white vapor and small amounts of diffuse blue vapor rose from the summit crater. A small explosion at 1242 on 18 September produced a light gray ash plume that rose a few hundred meters above the crater and drifted NW.

Source: Rabaul Volcano Observatory (RVO)

Bagana (Papua New Guinea) - Report for 17 September-23 September 2014

Tue, 09/23/2014 - 8:10am

Based on analyses of satellite imagery and wind data, the Darwin VAAC reported that on 21 September an ash plume from Bagana rose to an altitude of 2.4 km (8,000 ft) a.s.l. and drifted 55 km W.

Source: Darwin Volcanic Ash Advisory Centre (VAAC)

Kuchinoerabujima (Japan) - Report for 17 September-23 September 2014

Tue, 09/23/2014 - 8:10am

JMA reported that no eruptions occurred from Kuchinoerabujima during 16-19 September. White plumes rose 600 m above the crater. Low-level seismicity continued and tremor was absent. The Alert Level remained at 3 (on a scale of 1-5).

Source: Japan Meteorological Agency (JMA)

Mayon (Philippines) - Report for 17 September-23 September 2014 - NEW

Tue, 09/23/2014 - 8:10am

PHIVOLCS reported that during 16-17 September the seismic network at Mayon recorded 38 volcanic earthquakes and 277 rockfall events. Bright incandescence from the crater was visible at night, and rolling incandescent rocks in the uppermost part of Bonga Gully indicated that the lava dome was breaching the SE part of the crater. The Alert Level was raised to 3 (on a 0-5 scale). PHIVOLCS recommended enforcement of the 6-km radius Permanent Danger Zone (PDZ) around the volcano and the 7-km Extended Danger Zone (EDZ) on the SE flank. On 17 September a news article indicated that almost 24,000 people from villages within an 8-km radius from the crater had been evacuated. During 17-18 September the network recorded 142 volcanic earthquakes and 251 rockfall events. Although rain clouds prevented visual observations of the crater, white steam plumes drifting SSW were noted. The network recorded 38 volcanic earthquakes and 277 rockfall events during 18-19 September; cloud cover prevented visual observations. During 19-21 September four volcanic earthquakes along with 8-22 rockfall events per day were recorded. White steam plumes drifted ENE and NNE during 20-21 September. During 21-23 September three volcanic earthquakes per day and 13-18 rockfall events per day were recorded; white steam plumes drifted NNE, NE, ENE, and SW.

Sources: Associated Press,Philippine Institute of Volcanology and Seismology (PHIVOLCS)

Reventador (Ecuador) - Report for 17 September-23 September 2014

Tue, 09/23/2014 - 8:10am

IG reported that vapor plumes with a low ash content rose 1-2 km above Reventador and drifted NW and SW during 17-22 September.

Source: Instituto Geofísico-Escuela Politécnica Nacional (IG)

Shishaldin (United States) - Report for 17 September-23 September 2014

Tue, 09/23/2014 - 8:10am

AVO reported that, although cloud cover sometimes obscured views of Shishaldin during 17-22 September, seismicity indicated that a low-level eruption was possibly continuing. Elevated surface temperatures at the summit were periodically detected in satellite images. Minor steam emissions were recorded by the web cam on 17 September. The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Watch.

Source: US Geological Survey Alaska Volcano Observatory (AVO)

Zhupanovsky (Russia) - Report for 17 September-23 September 2014

Tue, 09/23/2014 - 8:10am

KVERT reported that an explosive eruption at Zhupanovsky continued during 12-19 September. Volcanologists in Nalychevo Valley observed short-duration explosions on 13 September which generated ash plumes that rose to altitudes of 3.5-4 km (11,500-13,000 ft) a.s.l. and drifted E. Satellite images detected a daily thermal anomaly and ash plumes that rose to altitudes of 3.5-4 km (11,500-13,000 ft) a.s.l. and drifted 220 km SE and S during 13-14 and 16 September. The Aviation Color Code remained at Orange.

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)

Tungurahua (Ecuador) - Report for 17 September-23 September 2014

Tue, 09/23/2014 - 8:10am

IG reported that activity at Tungurahua remained at moderate-to-high levels during 17-22 September. On 18 September ash plumes rose 2 km and drifted mainly NW. Ashfall was reported in Cusúa (8 km NW), Mocha (25 km W), and Chacauco (NW), and windows vibrated at the Tungurahua Observatory (OVT) in Guadalupe (14 km N). An ash plume rose 2 km and drifted NW on 19 September. At night crater incandescence was noted and windows vibrated. A steam plume rose 2 km and drifted W and NW on 20 September, and ashfall was reported in Runtún (6 km NNE). On 21 September ash plumes rose 2.5 km and drifted NW; ashfall was reported in Manzano (8 km SW), Choglontus (13 km WSW), Bilbao (8 km W), Cusúa, Coltaló, and Motilones. Steam-and-ash plumes rose 2.5 km on 22 September and drifted W to NW. Ash fell in Cevallos, Quero, Mocha, and Tizaleo.

Source: Instituto Geofísico-Escuela Politécnica Nacional (IG)

Dukono (Indonesia) - Report for 17 September-23 September 2014

Tue, 09/23/2014 - 8:10am

Based on analyses of satellite imagery and wind data, the Darwin VAAC reported that on 16 and 18 September ash plumes from Dukono rose to an altitude of 2.4 km (8,000 ft) a.s.l. and drifted 35-65 km E and NE.

Source: Darwin Volcanic Ash Advisory Centre (VAAC)

Aira (Japan) - Report for 17 September-23 September 2014

Tue, 09/23/2014 - 8:10am

JMA reported that 24 explosions from Showa Crater at Aira Caldera’s Sakurajima volcano ejected tephra as far as 1,300 m during 16-19 September. The Alert Level remained at 3 (on a scale of 1-5). The Tokyo VAAC reported that during 17-23 September plumes rose to altitudes of 1.8-3.4 km (6,000-11,000 ft) a.s.l. and drifted in multiple directions. During 17-18 and 23 September pilots observed ash plumes that rose to altitudes of 2-3 km (7,000-10,000 ft) a.s.l.

Sources: Japan Meteorological Agency (JMA) ,Tokyo Volcanic Ash Advisory Center (VAAC)

Kilauea (United States) - Report for 17 September-23 September 2014

Tue, 09/23/2014 - 8:10am

During 17-23 September HVO reported that the circulating lava lake occasionally rose and fell in the deep pit within Kilauea's Halema'uma'u Crater. Gas emissions remained elevated. The plume from the vent continued to deposit variable amounts of ash, spatter, and Pele's hair onto nearby areas; smaller particles may have been dropped several kilometers away. At Pu'u 'O'o Crater, glow emanated from several outgassing openings in the crater floor. Two small lava ponds in the S pit were visible during the earlier part of the week, and small breakout flows near the crater burned adjacent forest. The NE-trending lava flow had advanced at an average rate of 290 m/day between 15 and 17 September and 190 m/day between 17 and 19 September, and continued to cause localized fires as it spread through the forest. By 22 September the flow extended 16.4 km from the vent (measured in a straight line), placing the active flow front within the NW portion of the Kaohe Homesteads, a vacant forested portion of the subdivision. The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Warning.

Source: US Geological Survey Hawaiian Volcano Observatory (HVO)

Sheveluch (Russia) - Report for 17 September-23 September 2014 - NEW

Tue, 09/23/2014 - 8:10am

KVERT reported that during 12-19 September lava-dome extrusion onto Shiveluch’s N flank was accompanied by ash explosions, incandescence, hot avalanches, and fumarolic activity. Satellite images detected a daily thermal anomaly over the dome. On 14 September a video camera recorded a short-duration explosion which produced an ash plume that rose 6 km (19,700 ft) a.s.l.; strong gas-and-steam activity was noted afterwards. On 24 September explosions generated ash plumes that rose 11 km (36,000 ft) a.s.l. and drifted N. Ash plumes also drifted E at an altitude of 5 km (16,400 ft) a.s.l. The Aviation Color Code was raised to Red.

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)

Asosan (Japan) - Report for 27 August-2 September 2014 - NEW

Thu, 09/04/2014 - 5:18am

On 27-29 August JMA reported volcanic earthquakes and elevated lake temperatures at Asosan's Nakadake Crater. On 30 August an eruption occurred with a gray-white plume of indeterminate height due to clouds prompted raising the Alert level to 2. On 31 August- 2 September was a small eruption and a gray white plume rose 800-1200 m above the crater rim. During 30 August-1 September the Tokyo VAAC reported ash plumes that rose 1.5-2.1 km (5,000-7,000 ft) a.s.l. and drifted N and NE. The Alert Level was raised to 2 (on a scale of 1-5).

Source: Japan Meteorological Agency (JMA)

Suwanosejima (Japan) - Report for 27 August-2 September 2014 - NEW

Thu, 09/04/2014 - 5:18am

During 28 August-1 September, the Tokyo VAAC reported eruptions at Suwanosejima. Ash plumes rose 1.8-2.7 km (6,000-9,000 ft) a.s.l. and drifted E, SE, S, and NE.

Source: Tokyo Volcanic Ash Advisory Center (VAAC)