Activity for the week of 16 August-22 August 2017
- Info & Contacts
Activity for the week of 16 August-22 August 2017
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.
|Ulawun||New Britain (Papua New Guinea)||New|
|Bezymianny||Central Kamchatka (Russia)||Ongoing|
|Bogoslof||Fox Islands (USA)||Ongoing|
|Cleveland||Chuginadak Island (USA)||Ongoing|
|Karymsky||Eastern Kamchatka (Russia)||Ongoing|
|Kilauea||Hawaiian Islands (USA)||Ongoing|
|Klyuchevskoy||Central Kamchatka (Russia)||Ongoing|
|Langila||New Britain (Papua New Guinea)||Ongoing|
|Manam||Papua New Guinea||Ongoing|
|Piton de la Fournaise||Reunion Island (France)||Ongoing|
|Sheveluch||Central Kamchatka (Russia)||Ongoing|
|Suwanosejima||Ryukyu Islands (Japan)||Ongoing|
Kanlaon | Philippines | 10.412°N, 123.132°E | Elevation 2435 m
PHIVOLCS reported that between 24 June and 18 August the seismic network at Kanlaon detected 244 volcanic earthquakes. The report stated that the increased seismic activity could be followed by phreatic explosions at the summit crater, despite the absence of visible degassing or steaming from the active vent during 2017. The Alert Level was raised to 1 (on a scale of 0-5), and the public was warned to not enter the 4-km-radius Permanent Danger Zone (PDZ).
Pacaya | Guatemala | 14.382°N, 90.601°W | Elevation 2569 m
INSIVUMEH reported that during 20-22 August Strombolian explosions at Pacaya’s Mackenney cone ejected material as high as 75 m above the crater rim and onto the flanks, generating avalanches mainly on the W flank.
San Cristobal | Nicaragua | 12.702°N, 87.004°W | Elevation 1745 m
According to a news report, at 0518 on 18 August SINAPRED received reports of ash fall in some communities near San Cristóbal, including La Grecia, and the municipalities of El Viejo (18 km WSW) and El Realejo (25 km SW). Based on analysis of satellite images and information from INETER, the Washington VAAC reported that a small ash puff from the volcano rose 300 m above the crater rim and drifted NW. Later that day a gas emission possibly containing ash rose 300 m and drifted W. An ash plume identified in satellite images extended as far as 265 km W. Seismicity was elevated. Steam-and-gas emissions continued through the rest of the day.
Sangay | Ecuador | 2.005°S, 78.341°W | Elevation 5286 m
Based on information from IG, the Guayaquil MWO, and satellite data the Washington VAAC reported continuing ash emissions at Sangay. On 16 August an ash plume drifted W. On 17 August an ash plume rose to an altitude of 8.2 km (27,000 ft) a.s.l. and drifted NW, and was followed by several more ash puffs. During 19-20 August ash plumes rose to 5.8 km (19,000 ft) a.s.l. and drifted SW and W. A thermal anomaly was identified in satellite images on 20 August.
Ulawun | New Britain (Papua New Guinea) | 5.05°S, 151.33°E | Elevation 2334 m
Aira | Kyushu (Japan) | 31.593°N, 130.657°E | Elevation 1117 m
JMA reported 26 events at Showa Crater (at Aira Caldera’s Sakurajima volcano) during 18-21 August, one of which was explosive. Material was ejected as high and as far as 500 m. Ash plumes rose as high as 1.7 km above the crater rim. The Alert Level remained at 3 (on a 5-level scale).
Bezymianny | Central Kamchatka (Russia) | 55.972°N, 160.595°E | Elevation 2882 m
KVERT reported that during 11-18 August a daily thermal anomaly over Bezymianny was identified in satellite images. A lava flow continued to flow down the W flank of the dome; incandescence from the dome was visible at night. The Aviation Color Code remained at Orange (the second highest level on a four-color scale).
Bogoslof | Fox Islands (USA) | 53.93°N, 168.03°W | Elevation 150 m
AVO reported that photographs of Bogoslof taken during an overflight on 15 August showed that the vent area (which had dried out during the 7 August eruption) had refilled with water. Seismicity decreased on 16 August and remained low at least through 18 August. Weakly elevated surface temperatures consistent with a warm lake were identified in satellite data during 19-20 August. Satellite data acquired on 21 August showed an approximately 125-m-diameter lava dome within the intra-island lake, just W of the 1992 lava dome. A cold volcanic plume, likely from the lava dome, drifted about 55 km S of the island. Some minor explosions were detected in infrasound data at about 0410 on 22 August. The lava dome had grown to 160 m in diameter. The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Watch.
Cleveland | Chuginadak Island (USA) | 52.825°N, 169.944°W | Elevation 1730 m
AVO reported that elevated surface temperatures at Cleveland were identified in satellite data during 17-21 August. Minor degassing from the summit was observed in satellite and webcam images during 20-21 August. A 1-minute-long moderate explosion was detected at 1043 on 22 August in infrasound and seismic data. The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Watch.
Dukono | Halmahera (Indonesia) | 1.693°N, 127.894°E | Elevation 1229 m
Based on analyses of satellite imagery, wind model data, and notices from PVMBG, the Darwin VAAC reported that during 16-22 August ash plumes from Dukono rose to altitudes of 1.8-2.1 km (6,000-7,000 ft) a.s.l. and drifted E, NE, NW, and W. Ash plumes drifted as far as 150 km on 17 August.
Fuego | Guatemala | 14.473°N, 90.88°W | Elevation 3763 m
INSIVUMEH reported that the eighth effusive episode at Fuego in 2017 began on 20 August. Constant explosions generated ash plumes that rose 2.3 km above the crater and drifted more than 50 km W and SW. Ashfall was reported in areas downwind including Panimaché I (8 km SW), Morelia (9 km SW), Santa Sofía (12 km SW), El Porvenir (8 km ENE), Sangre de Cristo (8 km WSW), and Yepocapa (8 km WNW). Two lava fountains, each 300 m high, fed lava flows that traveled 1.4 km SSW down the Ceniza ravine and 1.2 km W down the Seca (Santa Teresa) ravine. Incandescent block avalanches occurred throughout the crater. Some explosions generated shock waves that rattled nearby structures. Seismicity decreased on 21 August. Weak explosions generated ash plumes that rose 1 km and drifted 20 km. Suspended ash from explosions and pyroclastic flows was visible. The lava flows had lengthened 200 m in the Ceniza ravine and 100 m in the Santa Teresa ravine. The report warned that pyroclastic flows were concentrated in the Santa Teresa ravine, possibly filling the drainage with deposits (similar to activity from 5 May) and increasing the chances for lahars. Ash fell in San Pedro Yepocapa (8 km N) and Chimaltenango (21 km NNE). On 22 August INSIVUMEH noted that after 48 hours the effusive episode was over. Explosions produced ash plumes that rose 1.2 km and drifted SW, and continued to vibrate nearby structures. Incandescent material was ejected as high as 200 m above the crater rim.
Karymsky | Eastern Kamchatka (Russia) | 54.049°N, 159.443°E | Elevation 1513 m
A thermal anomaly over Karymsky was identified in satellite images on 11 August, as well as ash plumes drifting about 400 km SE during 12-13 August. The Aviation Color Code remained at Orange (the second highest level on a four-color scale).
Kilauea | Hawaiian Islands (USA) | 19.421°N, 155.287°W | Elevation 1222 m
During 16-22 August HVO reported that the lava lake continued to rise, fall, and spatter in Kilauea’s Overlook crater. Webcams recorded incandescence from long-active sources within Pu'u 'O'o Crater. The 61G lava flow, originating from a vent on Pu'u 'O'o Crater's E flank, continued to enter the ocean at Kamokuna. A breakout 120 m up-slope of the ocean entry began at 0410 on 19 August and lasted about 9.5 hours; it produced a lava fall over the sea cliff W of the ramp and a small ‘a’a flow on the W portion of the delta. At 2135 a large littoral explosion occurred near the front of the delta, producing spatter that was ejected higher than the sea cliff (about 28 m high). Another smaller explosion was observed five minutes later. HVO scientists documented ongoing littoral explosions on 21 August, as well as continued widening of the cracks running parallel to the coastline.
Klyuchevskoy | Central Kamchatka (Russia) | 56.056°N, 160.642°E | Elevation 4754 m
KVERT reported that ash plumes from Klyuchevskoy were identified in satellite images drifting 315 km E and NW during 11-12 and 15-17 August. The Aviation Color Code remained at Orange (the second highest level on a four-color scale).
Langila | New Britain (Papua New Guinea) | 5.525°S, 148.42°E | Elevation 1330 m
Manam | Papua New Guinea | 4.08°S, 145.037°E | Elevation 1807 m
Piton de la Fournaise | Reunion Island (France) | 21.244°S, 55.708°E | Elevation 2632 m
Mainly based on seismicity, OVPF reported that the eruption at Piton de la Fournaise that began on 14 July continued during 16-22 August; weather clouds prevented visual and satellite observations most of the week. Volcanic tremor rapidly increased in the early evening on 15 August, concurrent with the presence of ephemeral lava fountains, at the cone and another area, visible in webcam images. The signal fluctuated at high levels until the evening of 19 August, when it began to stabilize at low levels. Satellite data from 19 August indicated a decreased lava-flow rate.
Poas | Costa Rica | 10.2°N, 84.233°W | Elevation 2708 m
OVSICORI-UNA reported that an event at Poás at 1517 on 22 August generated a plume that rose 300 m above the crater rim.
Sabancaya | Peru | 15.787°S, 71.857°W | Elevation 5960 m
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; there was an average of 41 explosions recorded per day during 14-20 August. The earthquakes were dominated by long-period signals, with fewer numbers of hybrid events recorded. Gas-and-ash plumes rose 3.4 km above the crater rim and drifted no more than 30 km SE. The report warned the public not to approach the crater within a 12-km radius.
Sheveluch | Central Kamchatka (Russia) | 56.653°N, 161.36°E | Elevation 3283 m
KVERT reported that a thermal anomaly was identified daily in satellite images over Sheveluch during 11-18 August. Ash plumes drifted about 180 km E, NW, and NE during 12 and 15-16 August. The Aviation Color Code remained at Orange.
Sinabung | Indonesia | 3.17°N, 98.392°E | Elevation 2460 m
PVMBG reported that the lava dome in Sinabung’s crater that had been growing since April was destroyed during the 2-3 August events. The dome had grown to an estimated volume of 2.3 million cubic meters. Measurements on 6 August indicated that a new dome had a volume of 23,700 cubic meters.
Based on PVMBG ground observations, the Darwin VAAC reported that on 16 August an ash plume from Sinabung rose to 2.7 km (9,000 ft) a.s.l. and drifted ESE.
Suwanosejima | Ryukyu Islands (Japan) | 29.638°N, 129.714°E | Elevation 796 m
Turrialba | Costa Rica | 10.025°N, 83.767°W | Elevation 3340 m
OVSICORI-UNA reported that an event at Turrialba at 1012 on 21 August generated a plume that rose 200 m above the crater rim and drifted NW.
Weekly Reports Archive
|Arenal||Grimsvotn||Manda Hararo||Seulawah Agam|
|Axial Seamount||Hekla||McDonald Islands||Sirung|
|Bagana||Home Reef||Metis Shoal||Sorikmarapi|
|Bamus||Hudson, Cerro||Miyakejima||Soufriere Hills|
|Banda Api||Huila, Nevado del||Momotombo||Soufrière St. Vincent|
|Bardarbunga||Hunga Tonga-Hunga Ha'apai||Monowai||South Sarigan Seamount|
|Barren Island||Ibu||Montagu Island||Spurr|
|Batur||Ijen||Moyorodake [Medvezhia]||St. Helens|
|Bristol Island||Ioto||Negro, Cerro||Sundoro|
|Cameroon||Kaba||NW Rota-1||Tair, Jebel at|
|Campi Flegrei Mar Sicilia||Kambalny||Nyamuragira||Takawangha|
|Chiles-Cerro Negro||Kasatochi||Palena Volcanic Group||Tara, Batu|
|Chillan, Nevados de||Katla||Paluweh||Telica|
|Cotopaxi||Kick 'em Jenny||Poas||Toliman|
|Dieng Volcanic Complex||Klyuchevskoy||Raoul Island||Ulawun|
|Dukono||Kolokol Group||Rasshua||Unknown Source|
|Ekarma||Krummel-Garbuna-Welcker||Rincon de la Vieja||West Mata|
|Etorofu-Yakeyama [Grozny Group]||Lamongan||Ruapehu||Zavodovski|
|Eyjafjallajokull||Langila||Ruiz, Nevado del||Zhupanovsky|
|Fonualei||Lengai, Ol Doinyo||Salak|
|Fournaise, Piton de la||Leroboleng||San Cristobal|
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.
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)