Activity for the week of 18 April-24 April 2018
- Info & Contacts
Activity for the week of 18 April-24 April 2018
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.
|Kilauea||Hawaiian Islands (USA)||New|
|Langila||New Britain (Papua New Guinea)||New|
|Maly Semyachik||Eastern Kamchatka (Russia)||New|
|Nevados de Chillan||Chile||New|
|Ebeko||Paramushir Island (Russia)||Ongoing|
|Karymsky||Eastern Kamchatka (Russia)||Ongoing|
|Kuchinoerabujima||Ryukyu Islands (Japan)||Ongoing|
|Sheveluch||Central Kamchatka (Russia)||Ongoing|
Ibu | Halmahera (Indonesia) | 1.488°N, 127.63°E | Elevation 1325 m
PVMBG reported that at 0637 on 20 April an eruption at Ibu generated a gray-white ash plume that rose at least 600 m above the crater rim and drifted S. The Alert Level remained at 2 (on a scale of 1-4), and the public was warned to stay at least 2 km away from the active crater, and 3.5 km away on the N side.
Kanlaon | Philippines | 10.412°N, 123.132°E | Elevation 2435 m
PHIVOLCS reported that during 17-19 April dirty-white steam plumes from Kanlaon rose as high as 1.2 km above the crater rim and drifted SW, NW, and NE. White steam plumes rose 300-600 m and drifted SW and NW during 20-24 April. The Alert Level remained at 2 (on a scale of 0-5).
Kilauea | Hawaiian Islands (USA) | 19.421°N, 155.287°W | Elevation 1222 m
During 18-24 April HVO reported that the lava lake continued to rise, fall, and spatter in Kilauea’s Overlook crater. The lake level was high, and by late on 21 April had overflowed the S crater rim. As of midday on 23 April the new flows has covered about 16 ha of the floor, or about 30%. Overflows of the crater rim continued through 24 April, flowing as far as 375 m onto the N, SW, and S parts of the crater floor. HVO noted that the overflows were the first significant ones since May 2015.
Surface lava flows were active above Pulama pali. On 18 April geologists observed the pit crater on the W side of Pu'u 'O'o Crater, noting that overflows had built up the crater rim to several meters above the crater floor and 7 m higher compared to late March.
Kirishimayama | Kyushu (Japan) | 31.934°N, 130.862°E | Elevation 1700 m
An explosive eruption at Iwo-yama (also called Ioyama, NW flank of Karakuni-dake), a stratovolcano of the Kirishimayama volcano group, occurred at 1555 on 19 April prompting JMA to raise the Alert Level to 3 (on a scale of 1-5). This was the first eruption in that area since 1768; frequent and recent activity has occurred from Shinmoedake (Shinmoe peak). Ash plumes rose as high as 500 m above new vents in the SE part of the crater, and a large amount of ejected tephra including boulders were deposited around the crater area. Webcams showed expansion of vents by 2100. A new fumarole was observed at 1630 on 20 April in the vicinity of the highway, on the W side of Iwo-yama. During overflights on 20 and 21 April scientists observed multiple vents with fumarolic emissions, and intermittent ejections of black-gray muddy water. The activity continued through 23 April.
Langila | New Britain (Papua New Guinea) | 5.525°S, 148.42°E | Elevation 1330 m
Based on analyses of satellite imagery and model data, the Darwin VAAC reported that on 24 April an ash plume from Langila rose to an altitude of 4 km (13,000 ft) a.s.l. and drifted SW. An image acquired around six hours later indicated that the ash from the event had dissipated.
Maly Semyachik | Eastern Kamchatka (Russia) | 54.135°N, 159.674°E | Elevation 1527 m
KVERT reported that activity at Maly Semyachik increased during the second half of March; the ice covering the crater lake melted within a 5-6-day period, and a weak thermal anomaly was visible in satellite images. The Aviation Color Code was raised to Yellow (the second lowest level on a four-color scale) on 22 March. A weak thermal anomaly continued to be detected through 20 April, though no further activity prompted KVERT to lower the Aviation Color Code to Green.
Nevados de Chillan | Chile | 36.868°S, 71.378°W | Elevation 3180 m
Servicio Nacional de Geología and Minería (SERNAGEOMIN) Observatorio Volcanológico de Los Andes del Sur (OVDAS) reported continuing activity during 17-18 April associated with growth of the Gil-Cruz lava dome in Nevados de Chillán’s Nicanor Crater. Seismicity consisted of long-period events and tremor associated with explosions. The webcam recorded pulsating white gas emissions with possible ash, nighttime incandescence, and an intermittent ejection of ballistics from explosions. The Alert Level remained at Orange, the second highest level on a four-color scale. ONEMI maintained an Alert Level Yellow (the middle level on a three-color scale) for the communities of Pinto, Coihueco, and San Fabián.
Sinabung | Indonesia | 3.17°N, 98.392°E | Elevation 2460 m
PVMBG reported that during 18-22 April gray-to-white plumes from Sinabung rose as high as 500 m above the crater rim and drifted in multiple directions. At 1604 on 20 April an event produced an ash plume that rose 3 km and pyroclastic flows that traveled 1 km down the E, SE, W, and NW flanks. The Alert Level remained at 4 (on a scale of 1-4), with a general exclusion zone of 3 km and extensions of 7 km on the SSE sector, 6 km in the ESE sector, and 4 km in the NNE sector.
Agung | Bali (Indonesia) | 8.343°S, 115.508°E | Elevation 2997 m
PVMBG reported that although there were often foggy conditions during 18-24 April, white plumes were observed rising as high as 300 m above Agung’s crater rim and drifting E. The Alert Level remained at 3 (on a scale of 1-4) and the exclusion zone continued at a 4-km radius.
Aira | Kyushu (Japan) | 31.593°N, 130.657°E | Elevation 1117 m
JMA reported that there were eight events and 13 explosions at Minamidake crater (at Aira Caldera’s Sakurajima volcano) during 16-23 April. Tephra was ejected as far as 1.1 km from the crater, and plumes rose as high as 2.5 km above the crater rim. At 0038 on 22 April an explosion produced an ash plume that rose 3.3 km and ejected tephra as far as 1.3 km. Crater incandescence was visible on most nights. The Alert Level remained at 3 (on a 5-level scale).
Ambae | Vanuatu | 15.4°S, 167.83°E | Elevation 1496 m
Vanuatu Geohazards Observatory (VGO) reported that during April the eruption from a cone in Ambae’s Lake Voui continued through 23 April, with ash emissions and some lava fountaining. Ash, scoria, and acid rain fell on the island. Observations on 21 April confirmed that the cone had grown, and that the crater in the center of the cone was larger; a small lake was present in the crater. The Alert Level remained at 3 (on a scale of 0-5), and the report reminded residents to stay at least 3 km away from the active crater.
Source: Vanuatu Geohazards Observatory
Ambrym | Vanuatu | 16.25°S, 168.12°E | Elevation 1334 m
On 25 April the Vanuatu Geohazards Observatory (VGO) reported that the lava lakes in Ambrym’s Benbow and Marum craters continued to be active, and produced gas-and-steam emissions. The Alert Level remained at 2 (on a scale of 0-5); the report reminded the public to stay outside of the Permanent Danger Zone defined as a 1-km radius from Benbow Crater and a 2.7-km radius from Marum Crater.
Source: Vanuatu Geohazards Observatory
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 19-24 April ash plumes from Dukono rose to an altitude of 2.1 km (7,000 ft) a.s.l. and drifted in multiple directions.
Ebeko | Paramushir Island (Russia) | 50.686°N, 156.014°E | Elevation 1103 m
Volcanologists in Severo-Kurilsk (Paramushir Island), about 7 km E of Ebeko, observed explosions during 15 and 17-19 April that sent ash plumes as high as 2.6 km (8,500 ft) a.s.l. The Aviation Color Code remained at Orange (the second highest level on a four-color scale).
Karymsky | Eastern Kamchatka (Russia) | 54.049°N, 159.443°E | Elevation 1513 m
KVERT reported that the last explosive event at Karymsky occurred on 27 January, and the last thermal anomaly was detected on 26 March. The Aviation Color Code was lowered to Yellow (the second lowest level on a four-color scale).
Kuchinoerabujima | Ryukyu Islands (Japan) | 30.443°N, 130.217°E | Elevation 657 m
JMA reported that a low-temperature thermal anomaly persisted near the W fracture in Kuchinoerabujima Shindake crater. In addition, both the number of volcanic earthquakes (generally occurring in a large quantity) and sulfur dioxide flux remained above baselines levels in August 2014. No eruptions have occurred since 19 June 2015, and deflation had been recorded since January 2016; the Alert Level was lowered to 3 (on a scale of 1-5).
Mayon | Luzon (Philippines) | 13.257°N, 123.685°E | Elevation 2462 m
PHIVOLCS reported that during 18-24 April white steam plumes from Mayon drifted NW, W, SW, and NE. Crater incandescence was visible at night. The sulfur dioxide flux was 796 tonnes/day on 17 April. The Alert Level remained at 2 (on a 0-5 scale) and PHIVOLCS reminded residents to stay away from the 6-km-radius Permanent Danger Zone and the 7-km Extended Danger Zone on the SSW and ENE flanks.
Pacaya | Guatemala | 14.382°N, 90.601°W | Elevation 2569 m
INSIVUMEH reported increased activity at Pacaya’s Mackenney Crater during 18-19 April. Strombolian explosions ejected material as high as 50 m above the crater rim, and four lava flows traveled 200-500 m down the SW, W, and NW flanks. Strombolian explosions continued to be detected during 21-23 April.
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 increased compared to the previous week; explosions averaged 19 per day during 16-22 April. Seismicity was dominated by long-period events, with a rise in signals indicating emissions. Gas-and-ash plumes rose as high as 2.2 km above the crater rim and drifted 40 km NW, W, and SW. The MIROVA system detected five thermal anomalies, and on 17 April the sulfur dioxide gas flux was high at 3,421 tons/day. The report noted that the public should not approach the crater within a 12-km radius.
Sheveluch | Central Kamchatka (Russia) | 56.653°N, 161.36°E | Elevation 3283 m
Weekly Reports Archive
|Ahyi||Fuego||Little Sitkin||San Cristobal|
|Anatahan||Gorely||Maly Semyachik||Sarychev Peak|
|Azumayama||Home Reef||Metis Shoal||Slamet|
|Bamus||Huila, Nevado del||Momotombo||Sotara|
|Banda Api||Hunga Tonga-Hunga Ha'apai||Monowai||Soufriere Hills|
|Bardarbunga||Ibu||Montagu Island||Soufriere St. Vincent|
|Barren Island||Ijen||Moyorodake [Medvezhia]||South Sarigan Seamount|
|Brava||Ioto||Negra, Sierra||Sulu Range|
|Bristol Island||Iya||Negro, Cerro||Sumbing|
|Campi Flegrei Mar Sicilia||Kambalny||NW Rota-1||Tair, Jebel at|
|Chillan, Nevados de||Katla||Pagan||Tara, Batu|
|Chirinkotan||Kavachi||Palena Volcanic Group||Telica|
|Copahue||Kick 'em Jenny||Peuet Sague||Tokachidake|
|Descabezado Grande||Klyuchevskoy||Puyehue-Cordon Caulle||Turrialba|
|Dieng Volcanic Complex||Kolokol Group||Rabaul||Ubinas|
|Ebeko||Koryaksky||Raoul Island||Unknown Source|
|Erebus||Kverkfjoll||Rincon de la Vieja||White Island|
|Etorofu-Yakeyama [Grozny Group]||Langila||Rotorua||Yasur|
|Fogo||Lengai, Ol Doinyo||Ruiz, Nevado del||Zhupanovsky|
|Fournaise, Piton de la||Lewotobi||Sakar|
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.
4. Many news agencies do not archive the articles they post on the Internet, and therefore the links to some sources may not be active. To obtain information about the cited articles that are no longer available on the Internet contact the source.
5. USGS Disclaimer Statement for this Website:
Information presented on this website is considered public information and may be distributed or copied. Use of appropriate byline/photo/image credit is requested. We strongly recommend that USGS data be acquired directly from a USGS server and not through other sources that may change the data in some way. While USGS makes every effort to provide accurate and complete information, various data such as names, telephone numbers, etc. may change prior to updating. USGS welcomes suggestions on how to improve our home page and correct errors. USGS provides no warranty, expressed or implied, as to the accuracy, reliability or completeness of furnished data.
Some of the documents on this server may contain live references (or pointers) to information created and maintained by other organizations. Please note that USGS does not control and cannot guarantee the relevance, timeliness, or accuracy of these outside materials.
For site security purposes and to ensure that this service remains available to all users, this government computer system employs software programs to monitor network traffic to identify unauthorized attempts to upload or change information, or otherwise cause damage. Unauthorized attempts to upload information or change information on this website are strictly prohibited and may be punishable under the Computer Fraud and Abuse Act of 1986 and the National Information Infrastructure Protection Act. Information may also be used for authorized law enforcement investigations. (Last modified September 21, 1999.)
U.S. Department of the Interior, U.S. Geological Survey, Reston, VA, USA
Contact: USGS Web Team
USGS Privacy Statement
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) - now GNS Science
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)
KEMSD - Kamchatkan Experimental and Methodical Seismilogical Department
M - magnitude
METEOSAT - Meteorological Satellite
MEVO - Mount Erebus Volcano Observatory
MWO - Meteorological Watch Office
NOTAM - Notice to Airmen
OVDAS - Observatorio Volcanologico de los Andes del Sur (Chile)
ONEMI - Oficina Nacional de Emergencia - Ministerio del Interior (Chile)
OVPDLF - Observatoire Volcanologique du Piton de la Fournaise (France)
OVSICORI-UNA - Observatorio Vulcanologico y Sismologico de Costa Rica, Universidad Nacional (Costa Rica)
PHIVOLCS - Philippine Institute of Volcanology and Seismology (Philippines)
RSAM - Real-time Seismic Amplitude Measurement
RVO - Rabaul Volcano Observatory
SERNAGEOMIN - Servicio Nacional de Geologia y Mineria (Chile)
SIGMET - Significant Meteorological Information
SNET - Servicio Nacional de Estudios Territoriales (El Salvador)
SVERT - Sakhalin Volcanic Eruption Response Team (Russia)
UTC - Coordinated Universal Time
VAAC - Volcanic Ash Advisory Center
VAFTAD - Volcanic Ash Forecast Transport And Dispersion
VRC - Volcano Research Center (Japan)