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: 46 weeks 4 days ago

Fuego (Guatemala) - Report for 21 October-27 October 2015 - NEW

Wed, 10/28/2015 - 12:57am

INSIVUMEH reported that during 21-22 October explosions at Fuego generated ash plumes that rose 350-650 m above the crater. A lava flow advanced in the Santa Teresa (W) drainage. Seismicity increased during 25-26 October, and gas-and-ash plumes rose 1.2 km and drifted S and SW. Lava fountains rose as high as 200 m, feeding 850-m-long lava flows in the Santa Teresa and Trinidad (S) drainages. On 27 October lava fountains rose 300 m, and lava flows advanced as far as 1.5 km in the Santa Teresa, Trinidad, and Las Lajas (S) drainages. Strombolian explosions produced ash plumes that rose almost 1 km high.

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

Rinjani (Indonesia) - Report for 21 October-27 October 2015 - NEW

Wed, 10/28/2015 - 12:57am

PVMBG reported that on 25 October at 1004 an eruption at Rinjani generated an ash plume that rose 200 m above the Barujari crater, inside the caldera. Ash fell on the flanks, especially to the SW. The report noted that no seismic nor surficial precursory events were detected. The Alert Level was raised to 2 (on a scale of 1-4). Based on satellite observations, the Darwin VAAC reported that on 26 and 28 October ash plumes rose to altitudes of 3-4 km (10,000-13,000 ft) a.s.l. and drifted 45-75 km SW and WSW.

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

Turrialba (Costa Rica) - Report for 21 October-27 October 2015 - NEW

Wed, 10/28/2015 - 12:57am

OVSICORI-UNA reported that a small ash eruption at Turrialba began at 1153 on 23 October. An explosion at 1710 on 24 October produced an ash plume that rose 800 m above the crater and drifted SSW. Multiple explosive events occurred during 24-25 October; poor weather conditions sometimes prevented views of the activity. On 25 October 10-minute-long explosive events began at 0730 and 0927 and generated ash plumes that rose 1.5 km and 200 m, respectively; plumes drifted NW and W. Pyroclastic flows from collapsing ash columns were generated both times. Volcanologists conducting fieldwork on 26 October observed morphological changes at the S edge of the W crater and nearby areas due to the recent activity. They noted fresh light-colored ash and tephra deposits on the steep wall of the active crater. Three small explosions generated ash, steam, and gas emissions. Tephra was deposited as far as 400 m away in various directions from the crater.

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

Bagana (Papua New Guinea) - Report for 21 October-27 October 2015

Wed, 10/28/2015 - 12:57am

Based on analyses of satellite imagery and wind data, the Darwin VAAC reported that during 21 and 24-26 October ash plumes from Bagana rose to altitudes of 1.5-2.4 km (5,000-8,000 ft) a.s.l. and drifted 45-85 km W and NW.

Source:

Santa Maria (Guatemala) - Report for 21 October-27 October 2015

Wed, 10/28/2015 - 12:57am

INSIVUMEH reported that on 21 October heavy rainfall in the area triggered steaming hot lahars which descended Santa María’s Nima I and San Isidro drainages. Both lahars carried blocks as large as 1.5 m in diameter; the Nimá I deposit was 18 m wide and 1.5 m deep. Explosions during 21-22 October generated ash plumes that rose 700 m above the crater and drifted SW, causing ashfall in El Rosario Palajunoj finca. Ash plumes from explosions drifted S and SE during 25-26 October; ashfall was reported in areas downwind.

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

Asosan (Japan) - Report for 21 October-27 October 2015

Wed, 10/28/2015 - 12:57am

JMA reported that since the 14 September eruptive activity at Asosan’s Nakadake Crater continued. On 23 October explosions generated ash plumes that rose 1.4-1.6 km above the crater, producing tepha-fall in areas to the W and NW. The Alert Level remained at 3 (on a scale of 1-5).

Source: Japan Meteorological Agency (JMA)

Cotopaxi (Ecuador) - Report for 21 October-27 October 2015

Wed, 10/28/2015 - 12:57am

IG reported that during 21-27 October gas, steam, and ash plumes rose from Cotopaxi almost daily as high as 2 km above the crater and drifted NW, W, and SW. A small lahar detected on 24 October descended the NW flank but stayed with Cotopaxi National Park boundaries. A small lahar descended the W flank the next day.

Source: Instituto Geofísico-Escuela Politécnica Nacional (IG)

Nevado del Ruiz (Colombia) - Report for 21 October-27 October 2015

Wed, 10/28/2015 - 12:57am

Servicio Geológico Colombiano’s (SGC) Observatorio Vulcanológico y Sismológico de Manizales reported that during 20-26 October seismicity at Nevado del Ruiz was characterized by long-period earthquakes and short-duration volcanic tremor associated with gas-and-ash emissions. Earthquakes occurred at depths between 1.1 and 8.8 km. The largest event was recorded at 0953 on 21 October, a local M 2.3, near Arenas Crater at a depth of 3.4 km. Significant amounts of water vapor and gas rose from the crater during the week. A gas, steam, and ash plume rose 2 km on 22 October. The Alert Level remained at III (Yellow; "changes in the behavior of volcanic activity").

Source: Servicio Geológico Colombiano (SGC)

Piton de la Fournaise (France) - Report for 21 October-27 October 2015

Wed, 10/28/2015 - 12:57am

OVPDLF reported that the effusive phase of the eruption at Piton de la Fournaise ended at 0802 on 19 October; around the same time tremor started to increase, and then gradually increased again starting at 0800 on 22 October. Observers reported that a small explosion in the vent ejected spatter.

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

Batu Tara (Indonesia) - Report for 21 October-27 October 2015

Wed, 10/28/2015 - 12:57am

Based on analyses of satellite imagery, the Darwin VAAC reported that during 22-26 October ash plumes from Batu Tara rose to altitudes of 1.5 km (5,000 ft) a.s.l. and drifted 35-65 km SW and W.

Source: Darwin Volcanic Ash Advisory Centre (VAAC)

Popocatepetl (Mexico) - Report for 21 October-27 October 2015

Wed, 10/28/2015 - 12:57am

CENAPRED reported that during 21-22 and 24-27 October the seismic network at Popocatépetl recorded 12-69 daily emissions; 128 were detected on 23 October. Cloud cover often prevented visual observations. Variable nighttime crater incandescence was observed on some days. Two, four, and six explosions were detected on 21, 22, and 23 October, respectively. Four explosions were detected during 26-27 October. The Alert Level remained at Yellow, Phase Two.

Source: Centro Nacional de Prevencion de Desastres (CENAPRED)

Sinabung (Indonesia) - Report for 21 October-27 October 2015

Wed, 10/28/2015 - 12:57am

Based on information from PVMBG, and analyses of satellite imagery and wind data, the Darwin VAAC reported that on 21 October an ash plume from Sinabung rose to an altitude of 6.1 (20,000 ft) a.s.l.

Source: Darwin Volcanic Ash Advisory Centre (VAAC)

Ubinas (Peru) - Report for 21 October-27 October 2015

Wed, 10/28/2015 - 12:57am

Instituto Geofísico del Perú (IGP) Observatorio Volcanológico del Sur (OVS) reported that during 20-26 October seismicity at Ubinas decreased overall; the level of long-period earthquakes remained high while hybrid and volcano-tectonic signals were at low levels. On 21 October an ash plume rose 1 km and drifted NE and E. Bluish gas-and-steam plumes rose from the crater during the rest of the period.

Source: Instituto Geofísico del Perú (IGP)

Colima (Mexico) - Report for 21 October-27 October 2015

Wed, 10/28/2015 - 12:57am

Based on satellite images, wind data, webcam views, and notices from the Mexico City MWO and Colima Tower, the Washington VAAC reported continuing emission from Colima. On 21 October an ash plume drifted N and quickly dissipated, and on 24 October an ash puff dissipated to the E. On 25 October a gas plume with minor amounts of ash was detected. An emission drifted NE on 28 October.

Source: Washington Volcanic Ash Advisory Center (VAAC)

Karymsky (Russia) - Report for 21 October-27 October 2015

Wed, 10/28/2015 - 12:57am

KVERT reported that moderate explosive activity at Karymsky continued during 16-23 October. Satellite images showed ash plumes drifting 100 km SE during 19-20 and 22 October, and a thermal anomaly over the volcano on 20 and 22 October. The Aviation Color Code remained at Orange.

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)

Shishaldin (United States) - Report for 21 October-27 October 2015

Wed, 10/28/2015 - 12:57am

AVO reported that seismicity at Shishaldin continued to be slightly elevated over background levels during 21-27 October, indicating that low-level eruptive activity confined to the summit crater continued. The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Watch.

Source: US Geological Survey Alaska Volcano Observatory (AVO)

Dukono (Indonesia) - Report for 21 October-27 October 2015

Wed, 10/28/2015 - 12:57am

Based on analyses of satellite imagery and wind data, the Darwin VAAC reported that during 21-26 and 28 October ash plumes from Dukono rose to altitudes of 1.5-2.4 km (5,000-8,000 ft) a.s.l. and drifted 25-140 km W, NW, NE, and E.

Source: Darwin Volcanic Ash Advisory Centre (VAAC)

Aira (Japan) - Report for 21 October-27 October 2015

Wed, 10/28/2015 - 12:57am

JMA reported that during 13-16 October small scale explosions occurred at Showa Crater, at Aira Caldera’s Sakurajima volcano. The Alert Level remained at 3 (on a 5-level scale).

Source: Japan Meteorological Agency (JMA)

Kilauea (United States) - Report for 21 October-27 October 2015

Wed, 10/28/2015 - 12:57am

HVO reported that seismicity beneath Kilauea's summit, upper East Rift Zone, and Southwest Rift Zone was at background levels during 21-27 October. The lava lake continued to circulate and spatter in the Overlook vent; small sections of the inner wall veneer fell into the lake on 22 October causing increased spattering and sloshing. The June 27th NE-trending lava flow continued to be active within 2.2-6.3 km NE of Pu'u 'O'o Crater.

Source: US Geological Survey Hawaiian Volcano Observatory (HVO)