Activity for the week of 15 April-21 April 2015
- Info & Contacts
Activity for the week of 15 April-21 April 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.
|Chikurachki||Paramushir Island (Russia)||New|
|Raung||Eastern Java (Indonesia)||New|
|Tongariro||North Island (New Zealand)||New|
|Chirinkotan||Kuril Islands (Russia)||Ongoing|
|Chirpoi||Kuril Islands (Russia)||Ongoing|
|Karymsky||Eastern Kamchatka (Russia)||Ongoing|
|Kilauea||Hawaiian Islands (USA)||Ongoing|
|Klyuchevskoy||Central Kamchatka (Russia)||Ongoing|
|Sheveluch||Central Kamchatka (Russia)||Ongoing|
|Shishaldin||Fox Islands (USA)||Ongoing|
|Tengger Caldera||Eastern Java (Indonesia)||Ongoing|
Chikurachki | Paramushir Island (Russia) | 50.324°N, 155.461°E | Elevation 1781 m
An observer from Severo-Kurilsk (60 km NW, Paramushir Island) reported that on 18 April a gas-and-steam plume from Chikurachki contained a small amount of ash. The Aviation Color Code was raised to Yellow.
Raung | Eastern Java (Indonesia) | 8.125°S, 114.042°E | Elevation 3332 m
PVMBG reported that, during infrequent times of clear weather in December 2014 and January 2015, white plumes were observed rising as high as 500 m above Raung's crater rim. In February and during 1-14 March plumes were gray-white and rose to a maximum height of 200 m. Crater incandescence and rumbling was reported. During 15 March-7 April emissions were gray-brown and rose as high as 200 m; rumbling continued to be heard. During 8-15 April gray-brown plumes rose as high as 300 m. Rumbling was heard on 8 April and crater incandescence was observed on 12 April. Continuous tremor was recorded during December 2014-12 January 2015; tremor was not continuous starting on 13 January, and RSAM values declined. The Alert Level remained at 2 (on a scale of 1-4).
Sinabung | Indonesia | 3.17°N, 98.392°E | Elevation 2460 m
PVMBG reported that during 6-12 April white plumes rose as high as 500 m above Sinabung; misty conditions prevented observations on 13 April. Lava was incandescent as far from the lava dome as 1.5 km S and SE. The main lava flow remained 2.9 km long. After pyroclastic flows descended the flanks on 2 April, a new lava flow from the growing dome formed near the crater and traveled 170 m SSE. Seismicity consisted of avalanche signals, low-frequency and hybrid events, local and far tectonic events, and volcanic earthquakes. Overall seismicity decreased compared to 30 March-6 April. Tilt and EDM (Electronic Distance Measurement) data fluctuated but showed overall deflation. The Alert Level remained at 3 (on a scale of 1-4). Visitors and tourists were prohibited from approaching the crater within a radius of 6 km on the S, 5 km on the SE, and 3 km in other directions.
Tongariro | North Island (New Zealand) | 39.157°S, 175.632°E | Elevation 1978 m
On 20 April GeoNet reported that it had been three weeks since anomalous seismicity at Tongariro's Ngauruhoe cone had been detected. In addition, no anomalous ground temperatures or unusual levels of gas emissions were detected at the summit during fieldwork, indicating that the minor unrest had ceased. The Volcanic Alert Level was lowered to 0 (on a scale of 0-5).
Source: New Zealand GeoNet Project
Tungurahua | Ecuador | 1.467°S, 78.442°W | Elevation 5023 m
IG reported moderate-to-high activity at Tungurahua during 15-21 April; gas, water vapor, and/or ash plumes were noted daily, although cloud cover often prevented observations. Explosions on 15 April generated ash plumes that rose 3 km above the crater, followed by water vapor-and-ash emissions that rose 2 km and drifted WSW. On 17 April constant gas emissions with minor ash content rose 500-1,000 m and drifted W.
Ubinas | Peru | 16.355°S, 70.903°W | Elevation 5672 m
According to Observatorio Volcanológico del Sur (OVS) and Observatorio Vulcanológico del INGEMMET (OVI), six explosions from Ubinas were recorded during 15-17 April, producing ash plumes that drifted 15 km SW, S, and SE. The largest ash plume, generated from an explosion detected at 0759 on 15 April, rose 3.5 km. The other explosions (at 1408 on 15 April, at 0600 on 16 April, and at 0743, 0936, and 1518 on 17 April) generated ash plumes that rose 1.5-1.8 km. Seismicity consisting of tornillos, hybrid events, and long-period events decreased from the previous week; the dominant signal was tremor characteristic of emissions and hydrothermal activity.
Aira | Kyushu (Japan) | 31.593°N, 130.657°E | Elevation 1117 m
JMA reported 23 explosions from Showa Crater at Aira Caldera’s Sakurajima volcano during 13-17 April. Incandescence from the crater was visible at night on 14 April. An explosion at 1355 on 17 April generated a large ash plume that rose 3 km above the crater, and a second explosion ejected tephra as far as 1,800 m. Inflation continued to be detected. The Alert Level remained at 3 (on a scale of 1-5). Based on JMA notices, the Tokyo VAAC reported that explosions during 15-18 and 20-21 April generated plumes which rose to altitudes of 1.2-4.6 km (4,000-15,000 ft) a.s.l. and drifted E and SE.
Chirinkotan | Kuril Islands (Russia) | 48.98°N, 153.48°E | Elevation 724 m
SVERT reported that during 17-18 April a thermal anomaly over Chirinkotan was detected in satellite images. Cloud cover prevented views of the volcano on the other days during 13-20 April. The Aviation Color Code remained at Yellow.
Chirpoi | Kuril Islands (Russia) | 46.525°N, 150.875°E | Elevation 742 m
SVERT reported that satellite images over Snow, a volcano of Chirpoi, detected a thermal anomaly on 14 and 17 April. Weak steam-and-gas emissions were also observed on 17 April. Cloud cover obscured views on other days during 13-20 April. The Aviation Color Code remained at Yellow.
Colima | Mexico | 19.514°N, 103.62°W | Elevation 3850 m
Based on satellite images, and webcam views, information from Colima University, Jalisco Civil Protection notices, Mexico City MWO notices, and wind data, the Washington VAAC reported multiple ash emissions per day from Colima during 15-20 April. Ash plumes rose to altitudes of 5.5-8.5 km (15,000-26,000 ft) a.s.l. and drifted NNE to E. Thermal anomalies were detected on 15 and 17 April. According to a news article ashfall was reported to the W in Guzman on 16 April.
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 15-16 April ash plumes from Dukono rose to an altitude of 2.7 km (9,000 ft) a.s.l. and drifted 45-65 km E, SE, and S.
Fuego | Guatemala | 14.473°N, 90.88°W | Elevation 3763 m
INSIVUMEH reported that during 15-17 April explosions at Fuego generated ash plumes that rose 650-850 m above the crater and drifted 8-11 km S, SW, and W. Incandescent tephra was ejected 150-200 m above the crater. Avalanches originated from the end of a 300-m-long lava flow in the Trinidad drainage. In a special report from 18 April INSIVUMEH noted that lava effusion had ended at 1730 that day. The activity that followed was characterized by explosions occurring at a rate of 2-4 per hour and crater incandescence. During 19-20 April explosions occurring at a rate of 2-3 per hour generated ash plumes that rose 450-750 m and drifted 4-6 km W and NW. Incandescent tephra was ejected 100 m high and avalanches descended the Ceniza and Trinidad drainages. Explosions during 20-21 April produced ash plumes that rose 550 m and drifted 7 km W and NW. Incandescent tephra was again ejected 100 m high.
Karymsky | Eastern Kamchatka (Russia) | 54.049°N, 159.443°E | Elevation 1513 m
Kilauea | Hawaiian Islands (USA) | 19.421°N, 155.287°W | Elevation 1222 m
During 15-21 April HVO reported that Kilauea’s 27 June NE-trending lava flow continued to be active with three areas of breakouts within and along the flow-field margins. The three main areas of breakouts were the 21 February breakout on the flank of Pu'u 'O'o, the 9 March breakout near the forested cone of Kahauale'a, and a relatively small forked breakout 5-6 km farther NE of Pu'u 'O'o. The thermal webcam recorded multiple incandescent outgassing vents in the crater. The circulating lava lake occasionally rose and fell in the deep pit within Halema'uma'u Crater. Gas emissions remained elevated. On 16 April several small lava flows extruded from two S vents on Pu'u 'O'o's crater floor.
Klyuchevskoy | Central Kamchatka (Russia) | 56.056°N, 160.642°E | Elevation 4754 m
On 18 April KVERT reported that Strombolian activity at Klyuchevskoy continued. A webcam recorded a narrow ash plume that rose 1-2 km and drifted 100 km SE. The Aviation Color Code was raised to Orange.
Popocatepetl | Mexico | 19.023°N, 98.622°W | Elevation 5426 m
CENAPRED reported that during 15-21 April the seismic network at Popocatépetl recorded 19-157 daily emissions. Cloud cover sometimes prevented observations of the crater, although ash plumes and nighttime crater incandescence were often noted. Explosions at 0617 and 0857 on 15 April generated ash plumes that rose 1 km and drifted E. On 17 April an explosion was detected as well as a steam-and-gas emission with low ash content that rose 1-2 km. The next day, on 18 April, six explosions generated steam-and-gas plumes with small amounts of ash that rose as high as 1.5 km and drifted NE. A series of smaller, low-intensity explosions between 1636 and 2330 produced emissions of steam, gas, and small amounts of ash that rose 300 m and drifted NE. Some incandescent tephra fell 100-500 m away onto the N and NE flanks. On 19 April seven explosions generated steam-and-gas plumes with small amounts of ash that rose as high as 1.5 km and drifted NE. At 1052 on 20 April an explosion produced an ash plume that rose 3 km and drifted E. Incandescent tephra was ejected 500 m E. On 21 April three explosions generated plumes with some ash that rose 500 m.
Reventador | Ecuador | 0.077°S, 77.656°W | Elevation 3562 m
During 15-21 April IG reported moderate seismic activity including explosions, long-period earthquakes, harmonic tremor, and signals indicating emissions at Reventador; cloud cover often prevented visual observations. During 15-16 April steam-and-ash plumes rose 500-1,000 m above the crater and drifted SW. On 18 April an emission of water vapor with minor ash content rose 800 m and drifted SW.
Sheveluch | Central Kamchatka (Russia) | 56.653°N, 161.36°E | Elevation 3283 m
KVERT reported that during 10-17 April lava-dome extrusion onto Sheveluch’s N flank was accompanied by incandescence, hot block avalanches, and fumarolic activity. Several ash plumes rose to an altitude of 7 km (23,000 ft) a.s.l. Satellite images showed ash plumes drifting as far as 380 km E and SE during 9-11 and 13-16 April. A daily thermal anomaly was also detected. The Aviation Color Code remained at Orange.
Shishaldin | Fox Islands (USA) | 54.756°N, 163.97°W | Elevation 2857 m
AVO reported that seismicity at Shishaldin continued to be elevated over background levels 15-21 April indicating that low-level eruptive activity confined to the summit crater likely continued. Cloud cover frequently prevented satellite and webcam observations. On 16 April the webcam periodically recorded a white steam plume rising about 500 m above the summit. Several pilot reports indicated ash emissions, prompting a SIGMET, however no ash was visible in satellite or webcam images, and seismicity remained unchanged. The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Watch.
Tengger Caldera | Eastern Java (Indonesia) | 7.942°S, 112.95°E | Elevation 2329 m
PVMBG reported that during January-10 April white plumes from Tengger Caldera's Bromo cone rose 50-100 m above the crater. A sulfur dioxide odor was noted at the Bromo observation post. Seismicity was dominated by tremor, but also consisted of volcanic earthquakes, shallow volcanic earthquakes, and distant tectonic earthquakes. The Alert Level remained at 2 (on a scale of 1-4). Residents and visitors were warned not to approach the crater within a radius of 1 km.
Turrialba | Costa Rica | 10.025°N, 83.767°W | Elevation 3340 m
The Washington VAAC reported that ash emissions from Turrialba were visible in the webcam on 20 April; weather clouds prevented ash detected in satellite images. Images later that day showed steam plumes with minor ash content.
Weekly Reports Archive
|Antuco||Great Sitkin||Makushin||Santa Maria|
|Apoyeque||Guagua Pichincha||Manda Hararo||Sarychev Peak|
|Azumayama||Hudson, Cerro||Metis Shoal||Sirung|
|Bagana||Huila, Nevado del||Michael||Slamet|
|Balbi||Hunga Tonga-Hunga Ha'apai||Misti, El||Soputan|
|Barren Island||Iliamna||Montagu Island||Soufrière Hills|
|Batur||Iliwerung||Moyorodake [Medvezhia]||Soufrière St. Vincent|
|Cameroon||Izu-Torishima||Negro, Cerro||Sulu Range|
|Campi Flegrei Mar Sicilia||Jackson Segment||Nightingale Island||Sumbing|
|Chiginagak||Karangetang [Api Siau]||Nyamuragira||Tair, Jebel at|
|Chillán, Nevados de||Karymsky||Ontakesan||Tanaga|
|Cleveland||Katmai||Palena Volcanic Group||Tara, Batu|
|Dempo||Kick 'em Jenny||Pinatubo||Tokachidake|
|Dieng Volcanic Complex||Kilauea||Poas||Toliman|
|Erebus||Krummel-Garbuna-Welcker Volcanic Complex||Raung||Veniaminof|
|Etorofu-Yakeyama [Grozny Group]||Kverkfjoll||Rincon de la Vieja||White Island|
|Fournaise, Piton de la||Lengai, Ol Doinyo||Ruapehu||Zubair Group|
|Fourpeaked||Leroboleng||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.
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)