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: 14 weeks 2 days ago

Katla (Iceland) - Report for 26 July-1 August 2017 - NEW

Tue, 08/01/2017 - 9:09pm

On 29 July the Iceland Met Office (IMO) reported that a glacial outburst flood (jökulhlaup) in the Múlakvísl river, SE of Katla, had begun, and a M 3 earthquake along with a few smaller earthquakes were located in the N part of the caldera. Nearby seismic stations detected tremor possibly linked to the flood, though a subglacial volcanic component was not ruled out. The Aviation Color Code was raised to Yellow, the second highest level on a four-color scale. The public was advised to stay away from the river; it was dark colored and had a sulfur odor. By 31 July the jökulhlaup had subsided with conductivity measurements and tremor slowly reaching normal levels. The Aviation Color Code was lowered to Green.

Source: Icelandic Met Office

Moyorodake [Medvezhia] (Japan - administered by Russia) - Report for 26 July-1 August 2017 - NEW

Tue, 08/01/2017 - 9:09pm

The Institute of Volcanology and Geodynamics (Russian Academy of Natural Science) reported that during the morning of 31 July volcanologists working on Kudryavy, a stratovolcano of the Medvezhia volcanic complex, noted a sharp increase in the volume of vapor-and-gas emissions, with a plume rising more than 1 km. The emissions rose from a new crater, Malysh, that was formed after the 1999 phreatic eruption. A significant increase in temperature (an average of 100 degrees Celsius) was measured at fumarolic sites, and new high-temperature areas were noted. Crusts of native sulfur at the boundaries of high-temperature areas were melting and burning. Two people at the top of the volcano and workers at the main base camp (3.5 km S) self-evacuated. The report noted that a M 5.7 earthquake had occurred at 0800 that same morning, 200 km NE, within the same system of tectonic faults that the volcano resides on. The volcano has a permeable system of fissures, through which there has been constant degassing for more than 130 years.

Source: Institute of Volcanology and Geodynamics, Russian Academy of Natural Science

Piton de la Fournaise (France) - Report for 26 July-1 August 2017 - NEW

Tue, 08/01/2017 - 9:09pm

OVPF reported that the eruption at Piton de la Fournaise that began on 14 July continued through 1 August, though weather conditions often prevented visual observations. Tremor levels fluctuated. A few estimates based on satellite data indicated a minimum flow rate of 1-2 cubic meters per second. During the early evening on 25 July two vents in the main cone were active, and lava frequently overflowed parts of the channel. Visual observations on 30 July revealed that the lava-flow terminus remained 2.8 km from the vents.

Source: Observatoire Volcanologique du Piton de la Fournaise (OVPF)

Sangay (Ecuador) - Report for 26 July-1 August 2017 - NEW

Tue, 08/01/2017 - 9:09pm

Based on information from the Guayaquil MWO, the Washington VAAC reported that on 1 August an emission from Sangay rose to an altitude of 5.3 km (17,500 ft) a.s.l. and drifted W.

Source: Washington Volcanic Ash Advisory Center (VAAC)

Sangeang Api (Indonesia) - Report for 26 July-1 August 2017 - NEW

Tue, 08/01/2017 - 9:09pm

Based on analyses of satellite imagery, pilot observations, and wind data, the Darwin VAAC reported that during 29-30 July ash plumes from Sangeang Api rose to altitudes of 2.4-2.7 km (8,000-9,000 ft) a.s.l. and drifted NW and W.

Source: Darwin Volcanic Ash Advisory Centre (VAAC)

Bagana (Papua New Guinea) - Report for 26 July-1 August 2017

Tue, 08/01/2017 - 9:09pm

Based on analyses of satellite imagery and model data, the Darwin VAAC reported that on 1 August an ash plume from Bagana drifted W at an altitude of 2.1 km (7,000 ft) a.s.l.

Source: Darwin Volcanic Ash Advisory Centre (VAAC)

Poas (Costa Rica) - Report for 26 July-1 August 2017

Tue, 08/01/2017 - 9:09pm

OVSICORI-UNA reported that on 1 August an event at Poás passively produced a plume that rose 500 m above the crater.

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

Sheveluch (Russia) - Report for 26 July-1 August 2017

Tue, 08/01/2017 - 9:09pm

KVERT reported that a thermal anomaly was identified daily during 21-28 July in satellite images over Sheveluch. Strong explosions on 23 July generated ash plumes that rose 11-12 km (36,100-39,400 ft) a.s.l. and during 23-24 July drifted 1,400 km E. The Aviation Color Code remained at Orange.

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)

Bezymianny (Russia) - Report for 26 July-1 August 2017

Tue, 08/01/2017 - 9:09pm

KVERT reported that during 21-28 July a thermal anomaly was identified daily over Bezymianny in satellite images. A lava flow continued to flow down the W flank of the dome. The Aviation Color Code remained at Orange (the second highest level on a four-color scale).

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)

Bogoslof (United States) - Report for 26 July-1 August 2017

Tue, 08/01/2017 - 9:09pm

AVO reported that during 26 July-1 August no activity at Bogoslof was observed in partly cloudy to clear satellite images, and no activity was detected in seismic, infrasound, or lightning data. The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Watch.

Source: US Geological Survey Alaska Volcano Observatory (AVO)

Cleveland (United States) - Report for 26 July-1 August 2017

Tue, 08/01/2017 - 9:09pm

AVO reported that during 26 July-1 August no activity was observed in seismic or infrasound data at Cleveland. The small lava dome on the floor of the crater had grown from 30 m in diameter to 42, and continued to inflate; the surface area of the dome was at least 50 x 45 m (~2,100 square meters), which was an increase of about 75% since 25 July (~1,200 square meters). Steam plumes rising from the crater were recorded by the webcam during 25 and 29-30 July, and elevated surface temperatures (consistent with lava-dome growth) were identified in satellite images during 30 July-1 August. The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Watch.

Source: US Geological Survey Alaska Volcano Observatory (AVO)

Klyuchevskoy (Russia) - Report for 26 July-1 August 2017

Tue, 08/01/2017 - 9:09pm

KVERT reported that during 22-27 July ash plumes from Klyuchevskoy were identified in satellite images drifting 120 km E and NE. The Aviation Color Code remained at Orange (the second highest level on a four-color scale).

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)

Sabancaya (Peru) - Report for 26 July-1 August 2017

Tue, 08/01/2017 - 9:09pm

Observatorio Vulcanológico del Sur del IGP (OVS-IGP) and Observatorio Vulcanológico del INGEMMET (OVI) reported that explosive activity at Sabancaya increased compared to the previous week; there was an average of 40 explosions recorded per day during 24-30 July. Gas-and-ash plumes rose 5 km above the crater rim and drifted more than 50 km NW and SE. Sulfur dioxide flux was as high as 2,530 tons per day, recorded on 28 July. The MIROVA system detected nine thermal anomalies.

Sources: Instituto Geofísico del Perú (IGP),Instituto Geológico Minero y Metalúrgico (INGEMMET)

Turrialba (Costa Rica) - Report for 26 July-1 August 2017

Tue, 08/01/2017 - 9:09pm

OVSICORI-UNA reported that on 26 July an event at Turrialba passively produced a plume that rose 300 m above the crater and drifted SW.

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

Sinabung (Indonesia) - Report for 26 July-1 August 2017

Tue, 08/01/2017 - 9:09pm

Based on PVMBG observations, satellite images, and wind data, the Darwin VAAC reported that during 26-29 and 31 July ash plumes from Sinabung rose 3.3-4.6 km (11,000-15,000 ft) a.s.l. and drifted NE, ENE, and ESE.

Source: Darwin Volcanic Ash Advisory Centre (VAAC)

Colima (Mexico) - Report for 26 July-1 August 2017

Tue, 08/01/2017 - 9:09pm

On 2 June the Centro Universitario de Estudios e Investigaciones de Vulcanologia - Universidad de Colima reported that during the previous week seismic data revealed 45 high-frequency events, 12 long-period events, 1.2 hours of tremor, 3 landslides, and one low-intensity explosion. Two lahars descended the La Lumbre ravine (SW) and three descended the Montegrande ravine (SSE); both ravines are in Colima state.

Source: Centro Universitario de Estudios e Investigaciones de Vulcanologia - Universidad de Colima

Dukono (Indonesia) - Report for 26 July-1 August 2017

Tue, 08/01/2017 - 9:09pm

Based on analyses of satellite imagery, wind model data, and notices from PVMBG, the Darwin VAAC reported that during 26 July-1 August ash plumes from Dukono rose to altitudes of 2.1-2.7 km (7,000-9,000 ft) a.s.l. and drifted in multiple directions.

Source: Darwin Volcanic Ash Advisory Centre (VAAC)

Aira (Japan) - Report for 26 July-1 August 2017

Tue, 08/01/2017 - 9:09pm

JMA reported two events at Showa Crater (at Aira Caldera?s Sakurajima volcano) during 24-28 July. One of the events generated an ash plume that rose 2 km above the crater rim. The Alert Level remained at 3 (on a 5-level scale).

Source: Japan Meteorological Agency (JMA)

Kilauea (United States) - Report for 26 July-1 August 2017

Tue, 08/01/2017 - 9:09pm

During 26 July-1 August HVO reported that the lava lake continued to rise, fall, and spatter in Kilauea?s Overlook crater. Webcams recorded incandescence from long-active sources within Pu'u 'O'o Crater. The 61G lava flow, originating from a vent on Pu'u 'O'o Crater's E flank, continued to enter the ocean at Kamokuna. Several large cracks running parallel to the coastline spanned the width of the delta. Surface lava flows were active above the pali and on the coastal plain about 2 km upslope from the gravel emergency route.

Source: US Geological Survey Hawaiian Volcano Observatory (HVO)