Activity for the week of 19 August-25 August 2015
- Info & Contacts
Activity for the week of 19 August-25 August 2015
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, notices of volcanic activity posted on these pages are preliminary and subject to change as events are studied in more detail. This is not a comprehensive list of all of Earth's volcanoes erupting during the week, but rather a summary of activity at volcanoes that meet criteria discussed in detail in the "Criteria and Disclaimers" section. Carefully reviewed, detailed reports on various volcanoes are published monthly in the Bulletin of the Global Volcanism Network.
|Cleveland||Chuginadak Island (USA)||New|
|Nevado del Ruiz||Colombia||New|
|Piton de la Fournaise||Reunion Island (France)||New|
|Barren Island||Andaman Islands (India)||Ongoing|
|Karymsky||Eastern Kamchatka (Russia)||Ongoing|
|Kilauea||Hawaiian Islands (USA)||Ongoing|
|Manam||Papua New Guinea||Ongoing|
|Raung||Eastern Java (Indonesia)||Ongoing|
|Sheveluch||Central Kamchatka (Russia)||Ongoing|
|Shishaldin||Fox Islands (USA)||Ongoing|
|Suwanosejima||Ryukyu Islands (Japan)||Ongoing|
|Tongariro||North Island (New Zealand)||Ongoing|
Aira | Kyushu (Japan) | 31.593°N, 130.657°E | Elevation 1117 m
JMA reported that a small-scale explosion from Showa Crater (Aira Caldera’s Sakurajima volcano) occurred on 19 August. In a report from 21 August JMA noted that the possibility of larger-scale eruption had decreased since 15 August. Deformation data during 15-16 August suggested a dike intrusion beneath Minamidake Crater, centered 1-3 km below sea level, with an estimated volume of 2 million cubic meters. Small-scale explosions at Showa Crater occurred on 21 and 23 August. The Alert Level remained at 4 (on a 5-level scale).
Cleveland | Chuginadak Island (USA) | 52.825°N, 169.944°W | Elevation 1730 m
On 21 August AVO reported that elevated surface temperatures detected at Cleveland's summit crater in satellite images during the previous few days likely indicated lava effusion. Minor steam emissions rose from the crater during 21-22 August. Elevated surface temperatures during 23-25 August were again detected. The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Watch.
Cotopaxi | Ecuador | 0.677°S, 78.436°W | Elevation 5911 m
IG reported that during an overflight of Cotopaxi on 18 August scientists observed continuous but variable amounts of ash and steam rising more than 100 m above the crater before descending the W flank. Significant amounts of ash were deposited on the flanks in an area from the N to the SW flanks. Several new cracks on the top of some glaciers were noted, especially on the E and NE flanks, and possible new tephra deposits on the N flank were observed. Thermal images revealed no hot material on the flanks; emissions prevented measurements of the inside of the crater. During 18-19 August emissions of steam and gas from Cotopaxi were occasionally observed during periods of clear weather. During the morning of 20 August gas plumes rose just above the crater and drifted W. The next day gas-and-steam plumes rose less than 2 km above the crater and drifted NW; cloud cover continued to sometimes prevent visual observations. On 22 August at 0426 the network detected an increase in the seismic amplitude. Steam-and-ash plumes rising 2 km from the crater were more sustained and higher compared to previous days; plumes drifted NW and WSW. Tremor began at 2141, and was accompanied by the onset of continuous ash emissions. Rangers confirmed ashfall at the entrance of Cotopaxi National Park. Throughout 23 August continuous ash emissions occurred with few breaks, rising no more than 1 km above the crater, and drifting SW. IGEPN staff found 2-mm-thick ash deposits that had accumulated during an 18-hour period. On 24 August ash deposits were noted in most of the N parts of Latacunga valley and reached the S moors of Romerillos. On 25 August ash plumes drifted WNW, causing ashfall in Machachi, Chaupi, and Tambillo.
Nevado del Ruiz | Colombia | 4.892°N, 75.324°W | Elevation 5279 m
On 23 August Servicio Geológico Colombiano’s (SGC) Observatorio Vulcanológico and Sismológico de Manizales reported that volcanic tremor associated with ash emissions from Nevado del Ruiz continued. Ashfall was confirmed by officials from Civil Aviation and the Parque Nacional Natural de los Nevados, as well as residents in Pereira. Earthquakes were located under the NE part of Arenas Crater, at depths between 3.5 and 5 km. The largest event was local M 2.
Piton de la Fournaise | Reunion Island (France) | 21.244°S, 55.708°E | Elevation 2632 m
On 24 August OVPDLF reported continued deformation and an increase in seismicity at Piton de la Fournaise during the previous several days, and a significant increase in seismicity that morning. Sulfur dioxide gas emissions increased at 1600, and at 1711 the seismic and deformation network indicated a magmatic intrusion. Lava fountains were visible at 1850 from a fissure on the S flank of Dolomieu Crater, at about 2000 m elevation, near Rivals Crater. The fissure propagated towards the top of Rivals, and at around 2115 a fissure opened to the NW, below Bory Crater. The lava-flow rate was 30-60 cubic meters per second. By the next morning fountains at higher elevations ceased, and were only active from a 100-m-long section near Rivals Crater. The lava flow rate had significantly decreased to 10 cubic meters per second. Near the top of the active fissure a 140-m-high cone had formed.
Ambrym | Vanuatu | 16.25°S, 168.12°E | Elevation 1334 m
On 21 August the Vanuatu Geohazards Observatory issued a statement reminding residents and visitors that Ambrym remained active; the Alert Level remained at 2 (on a scale of 0-5). Areas deemed hazardous were near and around the active vents (Benbow, Maben-Mbwelesu, Niri-Mbwelesu and Mbwelesu), and in downwind areas prone to ashfall.
Source: Vanuatu Geohazards Observatory
Barren Island | Andaman Islands (India) | 12.278°N, 93.858°E | Elevation 354 m
Calbuco | Chile | 41.326°S, 72.614°W | Elevation 2003 m
According to the civil protection agency, ONEMI, on 18 August OVDAS-SERNAGEOMIN reported that seismicity at Calbuco fluctuated at low levels and continued to decline, and only water vapor emissions rose from the vents. The Alert Level was lowered to Green (the lowest level on a four-color scale). ONEMI maintained an elevated Alert Level of Yellow (mid-level on a 3-color scale) for the Llanquihue and Puerto Octay provinces, and an Alert Level Green for Puerto Montt and Puerto Varas. On 21 August the 10-km exclusion zone around the volcano was lifted, but SERNAGEOMIN warned that the 1.5 km exclusion zone around the craters remained in effect and the public should continue to stay away from drainages.
Colima | Mexico | 19.514°N, 103.62°W | Elevation 3850 m
Based on satellite images, webcam views, and notices from the Mexico City MWO, Colima Observatory, and Jalisco civil protection agency, the Washington VAAC reported that during 20-21 and 24 August ash-and-gas plumes from Colima rose to altitudes of 4.2-7 km (14,000-23,000 ft) a.s.l. and drifted W, WNW, NW, NE, and SE. On 18 August an ash plume rose to an altitude of 5.2 km (17,000 ft) a.s.l. and slowly drifted W.
Dukono | Halmahera (Indonesia) | 1.68°N, 127.88°E | Elevation 1335 m
Based on analyses of satellite imagery and wind data, the Darwin VAAC reported that during 19-21 and 25-26 August ash plumes from Dukono rose to altitudes of 2.1-2.4 km (7,000-8,000 ft) a.s.l. and drifted 45-110 km W, WNW, NE, and E.
Fuego | Guatemala | 14.473°N, 90.88°W | Elevation 3763 m
INSIVUMEH reported that during 22-25 August explosions at Fuego produced booming noises, and ash plumes that rose 450-650 m above the crater and drifted 12 km W. Incandescent material was ejected 100-150 m above the crater. Ashfall was reported in Panimaché (8 km SW), Morelia (9 km SW), and Santa Sofía (12 km SW). Lahars descended the Trinidad drainage (S).
Karymsky | Eastern Kamchatka (Russia) | 54.049°N, 159.443°E | Elevation 1513 m
KVERT reported that moderate explosive activity at Karymsky continued during 14-21 August. Satellite images detected ash plumes drifting 54 km SE on 15 August, and a thermal anomaly on the volcano during 15 and 18-20 August. The Aviation Color Code remained at Orange.
Kilauea | Hawaiian Islands (USA) | 19.421°N, 155.287°W | Elevation 1222 m
HVO reported that seismicity at Kilauea remained at background levels during 19-25 August. The lava lake continued to circulate and spatter in the Overlook vent. Webcams recorded multiple incandescent outgassing vents within Pu'u 'O'o. The June 27th NE-trending lava flow continued to be active in three areas with surface flows within 4-8 km NE of Pu'u 'O'o Crater; smoke plumes from burning vegetation marked the most distal flows.
Manam | Papua New Guinea | 4.08°S, 145.037°E | Elevation 1807 m
Based on observations of satellite imagery and wind data analyses, the Darwin VAAC reported that during 21-22 August minor ash plumes from Manam rose to an altitude of 2.1 km (7,000 ft) a.s.l. and drifted 10-75 km NW and ESE.
Raung | Eastern Java (Indonesia) | 8.125°S, 114.042°E | Elevation 3332 m
PVMBG reported that ash plumes from Raung rose as high as 1 km above the crater during 16-24 August and drifted NW. Seismicity fluctuated but continued to decrease. The Alert Level was lowered to 2 (on a scale of 1-4) on 24 August, and the public was reminded not to approach the crater within a 2-km radius.
Reventador | Ecuador | 0.077°S, 77.656°W | Elevation 3562 m
During 19-25 August IG reported a high level of seismic activity including explosions, tremor, long-period earthquakes, harmonic tremor, and signals indicating emissions at Reventador; cloud cover often prevented visual observations. On 20 August a steam-and-ash plume rose 2 km and drifted S and SW. During 23-24 August steam-and-ash plumes rose 500-700 m and drifted NW.
Santa Maria | Guatemala | 14.756°N, 91.552°W | Elevation 3772 m
INSIVUMEH reported that during 23-25 August explosions from Caliente cone, part of Santa María's Santiaguito lava-dome complex, generated an ash plume that rose 700-800 m and drifted W and SW. Block avalanches from lava-flow fronts descended the E flanks. Ashfall was reported in Aldea, San Marcos (10 km SW), and Palajunoj (18 km SSW).
Sheveluch | Central Kamchatka (Russia) | 56.653°N, 161.36°E | Elevation 3283 m
KVERT reported that during 14-21 August lava-dome extrusion onto Sheveluch’s N flank was accompanied by fumarolic activity, dome incandescence, and hot avalanches. Satellite images detected a daily thermal anomaly over the dome. The Aviation Color Code remained at Orange.
Shishaldin | Fox Islands (USA) | 54.756°N, 163.97°W | Elevation 2857 m
AVO reported that on 18 August a field crew conducting gas measurements at Shishaldin observed a low-level plume from the summit drifting several kilometers downwind. Seismicity continued to be elevated over background levels during 19-25 August indicating that low-level eruptive activity confined to the summit crater continued. Cloud cover mostly prevented satellite and webcam observations; elevated surface temperatures were occasionally detected in satellite images. The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Watch.
Suwanosejima | Ryukyu Islands (Japan) | 29.638°N, 129.714°E | Elevation 796 m
Tongariro | North Island (New Zealand) | 39.157°S, 175.632°E | Elevation 1978 m
On 19 August GeoNet reported that activity at Tongariro's Te Maari Craters had declined significantly since the eruption in 2012, with data suggesting that unrest associated with the eruption was over. The Volcanic Alert Level was lowered to 0 (on a scale of 0-5). The Volcanic Alert Level for Ngauruhoe is separate and had been lowered to 0 on 20 April.
Source: New Zealand GeoNet Project
Tungurahua | Ecuador | 1.467°S, 78.442°W | Elevation 5023 m
IG reported moderate-to-high seismic activity at Tungurahua during 19-25 August, characterized by long-period events and volcano-tectonic events. Cloud cover often prevented visual observations. On 22 August water-vapor plumes with moderate amounts of ash drifted W. A small, reddish ash emission drifted W the next day. Five explosions on 25 August were felt by surrounding communities and generated ash plumes that rose 2 km. Ashfall was reported in Chontapamba (W), Bilbao (8 km W), Juive (7 km NNW), and Pillate (8 km W).
Weekly Reports Archive
|Alaid||Fukutoku-Oka-no-Ba||Little Sitkin||San Cristobal|
|Asamayama||Guagua Pichincha||Manda Hararo||Semeru|
|Azul, Cerro||Hierro||McDonald Islands||Sinarka|
|Bardarbunga||Huila, Nevado del||Misti, El||Sorikmarapi|
|Barren Island||Hunga Tonga-Hunga Ha'apai||Miyakejima||Sotara|
|Bezymianny||Ijen||Montagu Island||Soufrière St. Vincent|
|Cameroon||Ioto||Negra, Sierra||Sulu Range|
|Campi Flegrei Mar Sicilia||Izu-Torishima||Negro, Cerro||Sumbing|
|Cayambe||Jackson Segment||Nightingale Island||Sundoro|
|Chaiten||Kanlaon||NW Rota-1||Tair, Jebel at|
|Chillán, Nevados de||Karymsky||Ontakesan||Tandikat-Singgalang|
|Cleveland||Katmai||Palena Volcanic Group||Telica|
|Dabbahu||Kick 'em Jenny||Pinatubo||Tolbachik|
|Dieng Volcanic Complex||Kirishimayama||Popocatepetl||Tongkoko|
|Erebus||Krummel-Garbuna-Welcker Volcanic Complex||Redoubt||West Mata|
|Erta Ale||Kuchinoerabujima||Reventador||White Island|
|Etna||Kusatsu-Shiranesan||Rincon de la Vieja||Witori|
|Etorofu-Yakeyama [Grozny Group]||Kverkfjoll||Rinjani||Wolf|
|Fournaise, Piton de la||Lengai, Ol Doinyo||Ruiz, Nevado del|
News Feeds and Google Placemarks
The RSS (Really Simple Syndication) feed is identical to the Weekly Volcanic Activity Report minus some features including the header information (latitude and longitude and summit elevation), the Geologic Summary, and a link to the volcano's page from the Global Volcanism Program. Each volcano report includes a link from the volcano's name back to the more complete information in the Weekly Volcanic Activity Report on the Smithsonian website.
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A Google Earth network link for the Weekly Volcanic Activity Report can be loaded into the free Google Earth software, and in turn will load placemarks for volcanoes in the current weekly report. Placemark balloons include the volcano name, report date, report text, sources, and links back to the GVP volcano page for that volcano and to the complete Weekly Report for that week.
Criteria & Disclaimers
The Weekly Volcanic Activity Report does not necessarily include all volcanic activity that occurred on Earth during the week. More than a dozen volcanoes globally have displayed more-or-less continuous eruptive activity for decades or longer, and such routine activity is typically not reported here. Moreover, Earth's sea-floor volcanism is seldom reported even though in theory it represents the single most prolific source of erupted material. The Weekly Volcanic Activity Report summarizes volcanic activity that meets one or more of the following criteria:
- A volcano observatory raises or lowers the alert level at the volcano.
- A volcanic ash advisory has been released by a volcanic ash advisory center (VAAC) stating that an ash cloud has been produced from the volcano.
- A verifiable news report of new activity or a change in activity at the volcano has been issued.
- Observers have reported a significant change in volcanic activity. Such activity can include, but is not restricted to, pyroclastic flows, lahars, lava flows, dome collapse, or increased unrest.
Volcanoes are included in the "New Activity/Unrest" section of the Weekly Volcanic Activity Report if the activity occurs after at least 3 months of quiescence. Once a volcano is included in the "New Activity/Unrest" section, updates will remain in that section unless the activity continues for more than 1 month without escalating, after which time updates will be listed in the "Continuing Activity" section. Volcanoes are also included in the "New Activity/Unrest" section if the volcano is undergoing a period of relatively high unrest, or increasing unrest. This is commonly equal to Alert Level Orange on a scale of Green, Yellow, Orange, Red, where Red is the highest alert. Or alert level 3 on a scale of 1-4 or 1-5.
It is important to note that volcanic activity meeting one or more of these criteria may occur during the week, but may not be included in the Weekly Volcanic Activity Report because we did not receive a report.
1. The Weekly Volcanic Activity Report is intended to provide timely information about global volcanism on a weekly basis. Consequently, the report is generated rapidly by summarizing volcanic reports from various sources, with little time for fact checking. The accuracy of the Weekly Volcanic Activity Report is dependent upon the quality of the volcanic activity reports we receive. Reports published in the Bulletin of the Global Volcanism Network are monthly, and more carefully reviewed, although all of the volcanoes discussed in the Weekly Volcanic Activity Report are not necessarily reported in the Bulletin. Because of our emphasis on rapid reporting on the web we have avoided diacritical marks. Reports are updated on the Weekly Volcanic Activity Report web page as they are received, therefore information may be included regarding events that occurred before the current report period.
2. Rapidly developing events lead to coverage that is often fragmentary. Volcanoes, their eruptions, and their plumes and associated atmospheric effects are complex phenomena that may require months to years of data analysis in order to create a comprehensive summary and interpretation of events.
3. Preliminary accounts sometimes contain exaggerations and "false alarms," and accordingly, this report may include some events ultimately found to be erroneous or misleading.
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RSS and CAP Feeds
An RSS (Really Simple Syndication) feed for the Weekly Volcanic Activity Report first made available on 5 March 2008 can be utilized with the aid of various free downloadable readers. The report content of the news feed is identical to the Weekly Volcanic Activity Report minus some features including the header information (latitude and longitude and summit elevation), the Geologic Summary, and a link to the volcano's page from the Global Volcanism Program. Each volcano report includes a link from the volcano's name back to the more complete information in the Weekly Volcanic Activity Report on the Smithsonian website. On 12 March 2009, GeoRSS tags were added so that the latitude and longitude for each volcano could be included with the feed.
At the end of each individual report is a list of the sources used. We would like to emphasize that 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.
CAP (Common Alerting Protocol) feeds are XML files specifically formatted for disaster management.
Google Earth Placemarks
A Google Earth network link for the Weekly Volcanic Activity Report was first made available on 1 April 2009. This file can be loaded into the free Google Earth software, and in turn will load placemarks for volcanoes in the current weekly report. Placemark balloons include the volcano name, report date, report text, sources, and links back to the GVP volcano page for that volcano and to the complete Weekly Report for that week.
Acronyms and Abbreviations
a.s.l. - above sea level
CENAPRED - Centro Nacionale de Prevencion de Desastres (México)
COSPEC - Correlation Spectrometer
CVGHM (formerly VSI) - Center of Volcanology and Geological Hazard Mitigation
GMS - Geostationary Meteorological Satellite
GVO - Goma Volcano Observatory
ICE - Instituto Costarricense de Electricidad (Costa Rica)
IG - Instituto Geofísico (Ecuador)
IGNS - Institute of Geological and Nuclear Sciences (New Zealand)
INETER - Instituto Nicaragüense de Estudios Territoriales (Nicaragua)
INGEMMET - Instituto Geológical Minero y Metalúrgico (Peru)
INGEOMINAS - Instituto Colombiano de Geología y Minería (Colombia)
INGV-CT - Istituto Nazionale di Geofisica e Vulcanologia - Sezione di Catania (Italy)
INSIVUMEH - Instituto Nacional de Sismologia, Vulcanologia, Meteorologia e Hidrologia (Guatemala)
IRD - Institut de Recherche pour le Développement (France)
M - magnitude
METEOSAT - Meteorological Satellite
MWO - Meteorological Watch Office
NOTAM - Notice to Airmen
OVSICORI-UNA - Observatorio Vulcanologico y Sismologico de Costa Rica, Universidad Nacional (Costa Rica)
RSAM - Real-time Seismic Amplitude Measurement
RVO - Rabaul Volcano Observatory
SERNAGEOMIN - Servicio Nacional de Geología y Minería (Chile)
SIGMET - Significant Meteorological Information
SNET - Servicio Nacional de Estudios Territoriales (El Salvador)
SVERT - Sakhalin Volcanic Eruption Response Team (Kurile Islands)
UTC - Coordinated Universal Time
VAAC - Volcanic Ash Advisory Center
VRC - Volcano Research Center (Japan)