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: 32 weeks 5 days ago

Ambae (Vanuatu) - Report for 11 April-17 April 2018 - NEW

Tue, 04/17/2018 - 11:35pm

Based on observations from satellites, webcams, pilots, and the Vanuatu Geohazards Observatory (local community reports), the Wellington VAAC reported that during 11-14 April ash plumes from the vent at Ambae?s Lake Voui rose to altitudes of 1.8-4.9 km (6,000-16,000 ft) a.s.l. and drifted N, NW, W, and SE. On 12 April news articles noted that ashfall had affected the N part of Ambae, with photos showing thick ashfall deposits on houses and agricultural land, and reports of contaminated water supplies. On 15 April a VAAC office reported that the eruption has ceased. The Alert Level remained at 3 (on a scale of 0-5).

Sources: ABC News - Australian Broadcasting Corporation,Wellington Volcanic Ash Advisory Center (VAAC)

Langila (Papua New Guinea) - Report for 11 April-17 April 2018 - NEW

Tue, 04/17/2018 - 11:35pm

Based on analyses of satellite imagery and wind model data, the Darwin VAAC reported that on 15 April a discrete, low-level ash plume from Langila rose to an altitude of 3.7 km (12,000 ft) a.s.l. and drifted S.

Source: Darwin Volcanic Ash Advisory Centre (VAAC)

Bagana (Papua New Guinea) - Report for 11 April-17 April 2018

Tue, 04/17/2018 - 11:35pm

Based on analyses of satellite imagery and model data, the Darwin VAAC reported that during 14-15 April ash plumes from Bagana rose to altitudes of 2.1-2.4 km (7,000-8,000 ft) a.s.l. and drifted about 110 km SW.

Source: Darwin Volcanic Ash Advisory Centre (VAAC)

Fuego (Guatemala) - Report for 11 April-17 April 2018

Tue, 04/17/2018 - 11:35pm

INSIVUMEH reported that on 9 April a lahar descended the Seca (Santa Teresa) drainage on Fuego?s W flank. The lahar was 10 m wide, 1.5 m deep, and had a consistency similar to cement mix. During 12-13 April explosions generated ash plumes that rose as high as 1 km and drifted 15 km SW and W. Incandescent material was ejected as high as 300 m above the crater rim, and generated avalanches of material in the Seca, Cenizas (SSW), Las Lajas (SE), and Honda (E) ravines. Ash fell in areas downwind including in Santa Sofía (12 km SW), Morelia (9 km SW), Panimaché (8 km SW), (SSW), Las Lajas (SE), and Honda (E) ravines. Ash fell in areas downwind including in Santa Sofía (12 km SW), Morelia (9 km SW), Panimaché (8 km SW), El Porvenir (8 km ENE), and Finca Palo Verde. Activity increased on 14 April and remained elevated through 17 April. Moderate-to-strong explosions were detected at a rate of 6-9 per hour, and sometimes produced shock waves that vibrated houses in Morelia and Panimaché. Dense ash plumes rose as high as 1.1 km and drifted 20 km W and S, though winds also carried the ash to higher altitudes to the SE. Incandescent material was ejected as high as 300 m above the crater rim, and generated avalanches of material in the crater area. Ashfall was reported in areas downwind including in Santa Sofía, Morelia, Panimaché I and II, El Porvenir, and Finca Palo Verde. The rate of explosions increased to 7-10 per hour on 16 April; explosions sometimes caused structures in Panimache, Morelia, La Reina, and Alotenango (8 km ENE) to vibrate. A lava flow traveled 1.3 km down the Seca drainage.

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

Karymsky (Russia) - Report for 11 April-17 April 2018

Tue, 04/17/2018 - 11:35pm

KVERT reported that a weak thermal anomaly over Karymsky was identified in satellite data on 11 April. The Aviation Color Code remained at Orange (the second highest level on a four-color scale).

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)

Mayon (Philippines) - Report for 11 April-17 April 2018

Tue, 04/17/2018 - 11:35pm

PHIVOLCS reported that during 11-17 April white steam plumes from Mayon drifted NW, WNW, WSW, and SW. Crater incandescence was visible at night. The sulfur dioxide flux was 2,800, 1,918, 1,621, and 1,617 tonnes/day on 11, 12, 13, and 16 April, respectively. The Alert Level remained at 2 (on a 0-5 scale) and PHIVOLCS reminded residents to stay away from the 6-km-radius Permanent Danger Zone and the 7-km Extended Danger Zone on the SSW and ENE flanks.

Source: Philippine Institute of Volcanology and Seismology (PHIVOLCS)

Sabancaya (Peru) - Report for 11 April-17 April 2018

Tue, 04/17/2018 - 11:35pm

Observatorio Vulcanológico del Sur del IGP (OVS-IGP) and Observatorio Vulcanológico del INGEMMET (OVI) reported that explosive activity at Sabancaya was similar to the previous week; explosions averaged 15 per day during 9-15 April. Seismicity was dominated by long-period events, with signals indicating emissions. Gas-and-ash plumes rose as high as 2.2 km above the crater rim and drifted 30 km NW and SW. Minor ashfall was reported in Huambo and Cabanaconde. The MIROVA system detected three thermal anomalies. The report noted that the public should not to approach the crater within a 12-km radius.

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

Turrialba (Costa Rica) - Report for 11 April-17 April 2018

Tue, 04/17/2018 - 11:35pm

The Washington VAAC reported that on 11 April an ash emission from Turrialba were seen through an OVSICORI-UNA web camera.

Source: Washington Volcanic Ash Advisory Center (VAAC)

Agung (Indonesia) - Report for 11 April-17 April 2018

Tue, 04/17/2018 - 11:35pm

Based on webcam views, satellite data, and ground-based observations, the Darwin VAAC reported that on 11 April an event at Agung generated an ash plume that rose to an altitude of 3.7 km (12,000 ft) a.s.l. and drifted SW.

Sources: Darwin Volcanic Ash Advisory Centre (VAAC),Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)

Ebeko (Russia) - Report for 11 April-17 April 2018

Tue, 04/17/2018 - 11:35pm

Volcanologists in Severo-Kurilsk (Paramushir Island), about 7 km E of Ebeko, observed explosions during 7 and 11-12 April that sent ash plumes as high as 1.8 km (5,900 ft) a.s.l. Ashfall was reported in Severo-Kurilsk on 6 April. The Aviation Color Code remained at Orange (the second highest level on a four-color scale).

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)

Sheveluch (Russia) - Report for 11 April-17 April 2018

Tue, 04/17/2018 - 11:35pm

KVERT reported that a weak thermal anomaly over Sheveluch was identified in satellite images during 6 and 10-12 April. The Aviation Color Code remained at Orange.

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)

Cleveland (United States) - Report for 11 April-17 April 2018

Tue, 04/17/2018 - 11:35pm

AVO reported that a small explosion at Cleveland was detected in seismic and infrasound data at 0759 on 13 April; no eruption plume was visible in satellite images. The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Watch.

Source: US Geological Survey Alaska Volcano Observatory (AVO)

Sinabung (Indonesia) - Report for 11 April-17 April 2018 - NEW

Tue, 04/17/2018 - 11:35pm

PVMBG reported that at 0640 on 12 April an event at Sinabung generated an ash plume that rose 200 m and drifted WNW. At 1655 pyroclastic flows generated ash plumes that drifted WSW. At 0827 on 15 April an event generated an ash plume rose 1 km and drifted WNW. The Alert Level remained at 4 (on a scale of 1-4), with a general exclusion zone of 3 km and extensions of 7 km on the SSE sector, 6 km in the ESE sector, and 4 km in the NNE sector.

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

Dukono (Indonesia) - Report for 11 April-17 April 2018

Tue, 04/17/2018 - 11:35pm

Based on analyses of satellite imagery, wind model data, and notices from PVMBG, the Darwin VAAC reported that during 11-16 April ash plumes from Dukono rose to an altitude of 2.1 km (7,000 ft) a.s.l. and drifted mainly NW, W, SW, and NNE.

Sources: Darwin Volcanic Ash Advisory Centre (VAAC),Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)

Aira (Japan) - Report for 11 April-17 April 2018

Tue, 04/17/2018 - 11:35pm

JMA reported that there were four events and nine explosions at Minamidake crater (at Aira Caldera?s Sakurajima volcano) during 9-16 April. Tephra was ejected as far as 1.3 km from the crater, and plumes rose as high as 2.5 km above the crater rim. Crater incandescence was visible on most nights. The Alert Level remained at 3 (on a 5-level scale).

Source: Japan Meteorological Agency (JMA)

Kilauea (United States) - Report for 11 April-17 April 2018

Tue, 04/17/2018 - 11:35pm

During 11-17 April HVO reported that the lava lake continued to rise, fall, and spatter in Kilauea?s Overlook crater. The lake level was high, with spattering visible from HVO and Jaggar Museum; by 16 April the lake level was 10 m below the rim of the Overlook crater. Surface lava flows were active above Pulama pali. On 11 April a moderate swarm of over 200 earthquakes occurred at depths of 7-9 km below the summit. The largest event was a M 2.4. Seismicity returned to background levels at 0230. Three minor ledge collapses were detected on 12 April, one at 1157 and two just after 1830. Surface lava flows were active above Pulama pali; on 13 April most scattered breakouts were within 2.2 km from Pu'u 'O'o Crater, and one was about 5 km away.

Source: US Geological Survey Hawaiian Volcano Observatory (HVO)