Activity for the week of 30 November-6 December 2016
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.
New Activity / Unrest
| 45.9°S, 72.97°W
| Elevation 1905 m
Based on OVDAS-SERNAGEOMIN notices from 1 and 30 November, ONEMI reported on 2 December that, although the rate of seismicity at Cerro Hudson had remained at normal levels and similar to previous periods, the magnitude of the highest energy events had steadily increased during the last months. Additionally the earthquakes were occurring in the same general area as those detected during the 2011 volcanic crisis. OVDAS-SERNAGEOMIN raised the Alert Level to Yellow (second highest level on a four-color scale), and ONEMI declared an Alert Level Yellow (the middle level on a three-color scale) for the communities of Aysén, Río Ibáñez, and Chile Chico.
Sources: Oficina Nacional de Emergencia-Ministerio del Interior (ONEMI), Servicio Nacional de Geología y Minería (SERNAGEOMIN)
| Kuril Islands (Russia)
| 48.98°N, 153.48°E
| Elevation 724 m
SVERT reported that no additional activity at Chirinkotan was detected after the 29 November ash emission. The Aviation Color Code was lowered to Green (on a four-color scale) on 2 December.
Source: Sakhalin Volcanic Eruption Response Team (SVERT)
| Central Chile-Argentina border
| 37.856°S, 71.183°W
| Elevation 2953 m
Based on satellite and webcam images, the Buenos Aires VAAC reported that during 30 November-4 December and on 6 December diffuse gas, water vapor, and ash plumes from Copahue rose to altitudes of 3.3-4.2 km (11,000-14,000 ft) a.s.l. and drifted S, SE, and E.
On 2 December OVDAS-SERNAGEOMIN reported that activity at Copahue continued to be dominated by weak Strombolian explosions likely from a pyroclastic cone forming on the floor of El Agrio crater. The Alert Level remained at Yellow (second highest level on a four-color scale); SERNAGEOMIN recommended no entry into a restricted area within 1.5 km of the crater. ONEMI maintained an Alert Level Yellow (the middle level on a three-color scale) for the municipality of Alto Biobío.
Sources: Buenos Aires Volcanic Ash Advisory Center (VAAC), Oficina Nacional de Emergencia-Ministerio del Interior (ONEMI), Servicio Nacional de Geología y Minería (SERNAGEOMIN)
| New Britain (Papua New Guinea)
| 5.525°S, 148.42°E
| Elevation 1330 m
Based on analyses of satellite imagery and wind data, the Darwin VAAC reported that during 1-6 December ash plumes from Langila rose to altitudes of 2.1-3 km (7,000-10,000 ft) a.s.l. and drifted NE, NW, and W. The plumes on 3 December drifted almost 40 km.
Source: Darwin Volcanic Ash Advisory Centre (VAAC)
| 15.787°S, 71.857°W
| Elevation 5960 m
The Technical and Scientific Committee for volcanic risk management of the Arequipa region (comprised of five groups including IGP's OVS and INGEMMET's OVI) reported that during 30 November-2 December and 5-6 December explosions at Sabancaya generated ash-and-gas plumes that rose as high as 4.5 km above the crater rim and drifted around 40 km in multiple directions. Inflation at the SE flank continued to be detected. Seismic activity remained constant; tremor amplitude greatly increased on 2 December.
Sources: Instituto Geológico Minero y Metalúrgico (INGEMMET), Instituto Geofísico del Perú (IGP)
| Bougainville (Papua New Guinea)
| 6.137°S, 155.196°E
| Elevation 1855 m
Based on analyses of satellite imagery and model data, the Darwin VAAC reported that during 3-6 December ash plumes from Bagana rose to altitudes of 2.1-3 km (7,000-10,000 ft) a.s.l. and drifted NW, W, WSW, and SW.
Source: Darwin Volcanic Ash Advisory Centre (VAAC)
| Halmahera (Indonesia)
| 1.693°N, 127.894°E
| Elevation 1229 m
Based on analyses of satellite imagery, VONAs issued by the Dukono Volcano Observatory, and model data, the Darwin VAAC reported that during 30 November-6 December ash plumes rose to altitudes of 1.7-3 km (5,500-10,000 ft) a.s.l. and drifted NW, N, NE, and E.
Source: Darwin Volcanic Ash Advisory Centre (VAAC)
| Hawaiian Islands (USA)
| 19.421°N, 155.287°W
| Elevation 1222 m
During 30 November-6 December HVO reported that the lava lake continued to rise and fall, circulate, and spatter in Kilauea’s Overlook vent; the lake level rose as high as 7.5 m below the Halema’uma’u floor. A section of the wall of the Overlook Vent collapsed into the lava lake at 0658 on 2 December ejecting spatter onto the Halema’uma’u Crater rim. Webcams recorded incandescence from long-active sources within Pu'u 'O'o Crater and from a vent high on the NE flank of the cone. The 61G lava flow, originating from a vent on Pu'u 'O'o Crater's E flank, continued to enter the ocean near Kamokuna at the easternmost lava delta. Breakouts at the upper part of the lava-tube system sent lava E. Other breakouts occurred at the base of the Pulama pali and on the coastal plain about 1 km inland from ocean.
Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
Nevado del Ruiz
| 4.892°N, 75.324°W
| Elevation 5279 m
Servicio Geológico Colombiano’s (SGC) Observatorio Vulcanológico y Sismológico de Manizales reported that during 29 November-5 December seismicity at Nevado del Ruiz was characterized by a decrease in the number and magnitude of earthquakes compared to the previous week. Significant amounts of water vapor and gas rose from the crater. On 2 December a gas, water vapor, and ash plume rose 2 km above the crater rim and drifted between SW and NW directions. The Alert Level remained at III (Yellow; the second lowest level on a four-color scale).
Source: Servicio Geológico Colombiano (SGC)
| 0.077°S, 77.656°W
| Elevation 3562 m
During 30 November-6 December IG reported a high level of seismic activity including explosions, long-period earthquakes, harmonic tremor, and signals indicating emissions at Reventador; cloud cover sometimes prevented visual observations. Incandescent blocks were observed rolling as far as 1.6 km down the flanks. Gas, water vapor, and ash plumes were observed on most days rising as high as 1.5 km and drifted SW, W, NW, and NE.
Source: Instituto Geofísico-Escuela Politécnica Nacional (IG)
| Central Kamchatka (Russia)
| 56.653°N, 161.36°E
| Elevation 3283 m
KVERT reported that during 25 November-2 December lava-dome extrusion onto Sheveluch’s N flank was accompanied by strong fumarolic activity, dome incandescence, ash explosions, and hot avalanches. Satellite images showed a daily thermal anomaly over the dome and ash plumes drifting 375 km SE and S on 26 November and 1 December. The Aviation Color Code remained at Orange.
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
| 3.17°N, 98.392°E
| Elevation 2460 m
Based on satellite images, wind data, and the Jakarta MWO, the Darwin VAAC reported that on 30 November an ash plume from Sinabung rose to an altitude of 4.2 km (14,000 ft) a.s.l. and drifted SE. The report noted that the eruption had ceased and that the ash plume was expected to dissipate in the next hours.
Source: Darwin Volcanic Ash Advisory Centre (VAAC)
| Costa Rica
| 10.025°N, 83.767°W
| Elevation 3340 m
OVSICORI-UNA reported that at 1130 on 6 December an event at Turrialba generated a diffuse ash plume that rose 400 m above the crater and drifted W.
Source: Observatorio Vulcanologico y Sismologico de Costa Rica-Universidad Nacional (OVSICORI-UNA)
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.
The CAP (Common Alerting Protocol) feeds are XML files specifically formatted for disaster management. They are similar in content to the RSS feed, but contain no active links.
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.