OREGON STATE UNIVERSITY

GVP Eruption Reports

Syndicate content
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: 2 weeks 6 days ago

Poas (Costa Rica) - Report for 24 May-30 May 2017 - NEW

Tue, 05/30/2017 - 11:08pm

OVSICORI-UNA reported that tremor amplitude at Poás fluctuated between low and high levels during 23-30 May, often corresponding to the vigor of emissions of water vapor, magmatic gases, and material from fumarolic vents. During 25-26 May ashfall was reported in some communities around the volcano. Low magnitude volcano-tectonic earthquakes and small phreatic eruptions were recorded sporadically during 27-30 May.

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

Rincon de la Vieja (Costa Rica) - Report for 24 May-30 May 2017 - NEW

Tue, 05/30/2017 - 11:08pm

OVSICORI-UNA reported that a small hydrothermal explosion occurred at 1020 on 23 May in Rincón de la Vieja's crater lake, producing a small lahar that traveled down the N flank of the crater.

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

Sheveluch (Russia) - Report for 24 May-30 May 2017 - NEW

Tue, 05/30/2017 - 11:08pm

KVERT reported that during 23-25 May powerful explosions at Sheveluch generated ash plumes that rose 8 km (26,200 ft) a.s.l. and drifted 715 km in different directions. At 0830 on 25 May explosions generated ash plumes that rose 9-10 km (29,500-32,800 ft) a.s.l. and drifted 16 km NE. The Aviation Color Code (ACC) was raised to Red (the highest color on a four-color scale). Around 30 minutes later the ash plume was identified in satellite images drifting 45 km ENE. Strong steam-and-gas emissions rose from the lava dome. The ACC was lowered to Orange. Within the next hour the ash plume drifted 82 km E.

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)

Bezymianny (Russia) - Report for 24 May-30 May 2017

Tue, 05/30/2017 - 11:08pm

On 26 May KVERT reported that after an explosive eruption at Bezymianny on 9 March, and the effusion of several lava flows onto the dome flanks, the volcano became quiet. Gas-and-steam emissions continued, along with a thermal anomaly identified in satellite images. The Aviation Color Code was lowered to Yellow (the second lowest level on a four-color scale).

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)

Bogoslof (United States) - Report for 24 May-30 May 2017

Tue, 05/30/2017 - 11:08pm

An eruption at Bogoslof began at 1416 on 28 May prompting AVO to raise the Aviation Color Code (ACC) to Red and the Volcano Alert Level (VAL) to Warning. Pilot and satellite observations indicated than ash plumes rose at least 10.7 km (35,000 ft) a.s.l. and possibly as high as 13.7 km (45,000 ft) a.s.l. An observer on Unalaska Island reported seeing a large white-gray mushroom cloud form over Bogoslof, with ashfall to the W. The event lasted 50 minutes. On 29 May the ash cloud continued to drift NE. No detectable activity was observed in data from seismic or infrasound stations located on nearby Islands, and no new activity has been observed in satellite data. The ACC was lowered to Orange and the VAL was lowered to Watch.

Source: US Geological Survey Alaska Volcano Observatory (AVO)

Cleveland (United States) - Report for 24 May-30 May 2017

Tue, 05/30/2017 - 11:08pm

AVO reported that no significant volcanic activity at Cleveland was detected in seismic, infrasound, or mostly cloudy satellite images during 24-30 May. The webcam periodically recorded steam emissions. The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Watch.

Source: US Geological Survey Alaska Volcano Observatory (AVO)

Ebeko (Russia) - Report for 24 May-30 May 2017

Tue, 05/30/2017 - 11:08pm

KVERT reported that during 23-24 May explosions at Ebeko were observed by residents of Severo-Kurilsk (Paramushir Island) about 7 km E. Ash plumes rose as high as 2 km (6,600 ft) a.s.l. The Aviation Color Code remained at Orange (the second highest level on a four-color scale).

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)

Klyuchevskoy (Russia) - Report for 24 May-30 May 2017

Tue, 05/30/2017 - 11:08pm

KVERT reported that a weak thermal anomaly was identified in satellite images over Klyuchevskoy on 22 and 25 May; weather clouds often obscured views of the volcano. The Aviation Color Code remained at Orange (the second highest level on a four-color scale).

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)

Langila (Papua New Guinea) - Report for 24 May-30 May 2017

Tue, 05/30/2017 - 11:08pm

Based on analyses of satellite imagery and wind model data, the Darwin VAAC reported that during 24-27 May ash plumes from Langila rose 2.1-3 km (7,000-10,000 ft) a.s.l. and drifted 75-85 km W and NW.

Source: Darwin Volcanic Ash Advisory Centre (VAAC)

Manam (Papua New Guinea) - Report for 24 May-30 May 2017

Tue, 05/30/2017 - 11:08pm

RVO reported that Strombolian activity at Manam?s Southern Crater during 13-14 and 18 May generated lava flows that descended the SW valley. Lava flows traveled to 180-220 m elevation during 13-14 May but were significantly small on 18 May. Activity was low on other days during 13-26 May; ash plumes rose from the crater during 15-18 May. Conditions were quiet at Main Crater. RVO recommended that the Alert Level be lowered to Stage 1.

Source: Rabaul Volcano Observatory (RVO)

Pacaya (Guatemala) - Report for 24 May-30 May 2017

Tue, 05/30/2017 - 11:08pm

INSIVUMEH reported nighttime crater incandescence and small Strombolian explosions at Pacaya?s Mackenney cone during 27-28 May.

Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)

Sabancaya (Peru) - Report for 24 May-30 May 2017

Tue, 05/30/2017 - 11:08pm

Observatorio Vulcanológico del Sur del IGP (OVS-IGP) and Observatorio Vulcanológico del INGEMMET (OVI) reported that during 22-28 May explosive activity at Sabancaya slightly increased from the previous week, with an average of 41 explosions detected per day. Seismcity was dominated by long-period events, and the number and magnitude of hybrid events were low. Gas-and-ash plumes rose as high as 2.8 km above the crater rim and drifted more than 30 km E and SE. The MIROVA system detected two thermal anomalies.

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

Fuego (Guatemala) - Report for 24 May-30 May 2017

Tue, 05/30/2017 - 11:08pm

INSIVUMEH reported that on 23 May a hot lahar descended Fuego?s Santa Teresa (W) drainage, carrying blocks 2 m in diameter, branches, and tree trunks. The lahar was 10 m wide and 1 m high, and could be heard in the vicinity of the drainage. On 27 May a large hot lahar traveled down the Santa Teresa drainage, carrying blocks 2 m in diameter, branches, and tree trunks. The lahar was 30 m wide, 2 m high, and had a strong sulfur odor. During 24-25 and 27-30 May explosions generated ash plumes that rose as high as 950 m above the crater rim and drifted as far as 12 km W and SW. Ash fell in multiple areas including Panimaché I and II (8 km SW), Morelia (9 km SW), Santa Sofía (12 km SW), Los Yucales, El Porvenir, and Sangre de Cristo (8 km WSW). Incandescent material was ejected as high as 250 m above the crater rim, and caused avalanches of material that traveled into the Ceniza (SSW), Taniluyá (SW), and Santa Teresa drainages.

Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)

Turrialba (Costa Rica) - Report for 24 May-30 May 2017

Tue, 05/30/2017 - 11:08pm

OVSICORI-UNA reported that tremor amplitude at Turrialba fluctuated from low to high levels during 23-30 May, often corresponding to emission characteristics. Periods of volcano-tectonic and long-period events were also recorded. During 24-26 May several passive and sporadic ash emissions rose no higher than 500 m above the vent and drifted NW and SW. Frequent and small explosions during 26-27 May generated ash plumes that rose higher than 500 m above the vent, and ejected material higher than 200 m and no farther than 100 m towards Central Crater. Small explosions during 27-29 May produced ash plumes that rose 300-500 m.

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

Santa Maria (Guatemala) - Report for 24 May-30 May 2017

Tue, 05/30/2017 - 11:08pm

INSIVUMEH reported that during 24-25 May avalanches of material from Santa María's Santiaguito lava-dome complex traveled short distances down the flanks. During 27-30 May weak explosions generated ash plumes that rose 600-700 m and drifted W and SW. Ashfall was reported in Monte Claro (S).

Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)

Nevado del Ruiz (Colombia) - Report for 24 May-30 May 2017

Tue, 05/30/2017 - 11:08pm

Servicio Geológico Colombiano?s (SGC) Observatorio Vulcanológico y Sismológico de Manizales reported that during 23-29 May seismicity at Nevado del Ruiz continued to indicate unrest. Five episodes of drumbeat seismicity (low-energy long-period events) were recorded between 1343 and 1930 on 29 May, likely signifying growing lava domes. Significant amounts of water vapor and gas continued to be emitted. Gas, steam, and ash plumes rose 880 m above the crater rim on 27 May and drifted NW and SW. A thermal anomaly was identified on 28 May. The Alert Level remained at III (Yellow; the second lowest level on a four-color scale).

Source: Servicio Geológico Colombiano (SGC)

Sinabung (Indonesia) - Report for 24 May-30 May 2017

Tue, 05/30/2017 - 11:08pm

Based on PVMBG observations, webcam and satellite images, and wind data, the Darwin VAAC reported that during 24-29 May ash plumes from Sinabung rose 3.7-5.8 km (12,000-19,000 ft) a.s.l. and drifted in multiple directions.

Source: Darwin Volcanic Ash Advisory Centre (VAAC)

Colima (Mexico) - Report for 24 May-30 May 2017

Tue, 05/30/2017 - 11:08pm

On 26 May the Centro Universitario de Estudios e Investigaciones de Vulcanologia - Universidad de Colima reported that during the previous week seismic data revealed 36 high-frequency events, 20 long-period events, 2.6 hours of tremor, 12 landslides, and three low-intensity explosions. On 23 May sulfur dioxide emissions were below detectable limits (8.6 tons/day). A short-lived, low-amplitude episode of tremor was detected on 24 May.

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

Dukono (Indonesia) - Report for 24 May-30 May 2017

Tue, 05/30/2017 - 11:08pm

Based on analyses of satellite imagery and wind model data the Darwin VAAC reported that during 24-30 May ash plumes from Dukono rose to an altitude of 2.1 km (7,000 ft) a.s.l. and drifted NW, W, and SW. Plumes drifted over 230 km W on 27 May.

Source: Darwin Volcanic Ash Advisory Centre (VAAC)

Aira (Japan) - Report for 24 May-30 May 2017

Tue, 05/30/2017 - 11:08pm

JMA reported 22 events at Showa Crater (at Aira Caldera?s Sakurajima volcano) during 22-29 May, seven of which were explosive. The explosions ejected material as high as 800 m above the crater rim, and as far away as 500 m. Ash plumes rose as high as 3.3 km on 23 May and 3.4 km on 29 May. Crater incandescence was detected on 25 May. A very small event occurred at Minamidake summit crater on 26 May. The Alert Level remained at 3 (on a 5-level scale).

Source: Japan Meteorological Agency (JMA)