Logo link to homepage

Smithsonian / USGS Weekly Volcanic Activity Report

Weekly Volcanic Activity Map

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 that meet criteria discussed in detail in the "Criteria and Disclaimers" section. Carefully reviewed, detailed narratives on various volcanoes are published as reports of the Bulletin of the Global Volcanism Network.

Smithsonian / USGS Weekly Volcanic Activity Report for the week of 18 July-24 July 2001
Name Location Eruption Start Date Report Status
Etna Sicily (Italy) 2013 Sep 3 New
Sheveluch Central Kamchatka (Russia) 1999 Aug 15 New
Karangetang Siau Island (Indonesia) 2018 Nov 25 Continuing
Kilauea Hawaiian Islands (USA) 2020 Dec 20 Continuing
Krakatau Indonesia Continuing
Mayon Luzon (Philippines) Continuing
Merapi Central Java (Indonesia) 2020 Dec 31 Continuing
Popocatepetl Mexico 2005 Jan 9 Continuing
Semeru Eastern Java (Indonesia) 2014 Apr 1 ± 15 days Continuing
Soufriere Hills Montserrat Continuing
Tungurahua Ecuador Continuing
Weekly Reports Archive

Since the Weekly Volcanic Activity Report began in November 2000, there have been 16,408 individual reports over 1,051 weeks (average of 16 per week) on 309 different volcanoes.

Search by Date



Use the dropdowns to choose the year and week for archived Weekly Reports.

Use the dropdowns to choose the year and week for archived Weekly Reports.          



Search by Volcano



Agung Concepcion Ibu Lewotobi Papandayan Sorikmarapi
Ahyi Copahue Ijen Lewotolo Parker Sotara
Aira Cotopaxi Iliamna Little Sitkin Pavlof Soufriere Hills
Akan Cuicocha Iliwerung Llaima Pelee Soufriere St. Vincent
Alaid Cumbal Inielika Loihi Peuet Sague South Sarigan Seamount
Alu-Dalafilla Dabbahu Ioto Lokon-Empung Pinatubo Spurr
Ambae Dempo Irazu Lopevi Planchon-Peteroa St. Helens
Ambang Descabezado Grande Iya Machin Poas Stromboli
Ambrym Dieng Volcanic Complex Izu-Torishima Makian Popocatepetl Sulu Range
Anatahan Dukono Jackson Segment Makushin Puyehue-Cordon Caulle Sumbing
Antillanca Volcanic Complex Ebeko Kaba Maly Semyachik Rabaul Sundoro
Antuco Ebulobo Kadovar Manam Raikoke Suretamatai
Apoyeque Egon Kambalny Manda Hararo Ranakah Suwanosejima
Arenal Ekarma Kanaga Marapi Raoul Island Taal
Asamayama Epi Kanlaon Maroa Rasshua Tair, Jebel at
Askja Erebus Karangetang Martin Raung Takawangha
Asosan Erta Ale Karkar Masaya Redoubt Talang
Augustine Etna Karthala Maule, Laguna del Reventador Tambora
Avachinsky Etorofu-Yakeyama [Grozny Group] Karymsky Mauna Loa Reykjanes Tanaga
Awu Eyjafjallajokull Kasatochi Mayon Rincon de la Vieja Tandikat-Singgalang
Axial Seamount Fernandina Katla McDonald Islands Rinjani Tangkoko-Duasudara
Azul, Cerro Fogo Katmai Melimoyu Ritter Island Tangkuban Parahu
Azumayama Fonualei Kavachi Merapi Rotorua Tara, Batu
Bagana Fournaise, Piton de la Kelimutu Midagahara Ruang Telica
Balbi Fourpeaked Kelut Misti, El Ruapehu Tenerife
Bamus Fuego Kerinci Miyakejima Ruiz, Nevado del Tengger Caldera
Banda Api Fujisan Ketoi Momotombo Sabancaya Three Sisters
Bardarbunga Fukutoku-Oka-no-Ba Kharimkotan Monowai Sakar Tinakula
Barren Island Galeras Kick 'em Jenny Montagu Island Salak Tofua
Batur Galunggung Kikai Moyorodake [Medvezhia] San Cristobal Tokachidake
Bezymianny Gamalama Kilauea Mutnovsky San Miguel Tolbachik
Bogoslof Gamkonora Kirishimayama Myojinsho San Vicente Toliman
Brava Gaua Kizimen Nabro Sangay Tongariro
Bristol Island Gorely Klyuchevskoy Negra, Sierra Sangeang Api Tungurahua
Bulusan Great Sitkin Kolokol Group Negro, Cerro Santa Ana Turrialba
Calbuco Grimsvotn Korovin Nightingale Island Santa Maria Ubinas
Callaqui Guagua Pichincha Koryaksky Nishinoshima Sarigan Ulawun
Cameroon Guallatiri Krakatau Nisyros Sarychev Peak Unnamed
Campi Flegrei del Mar di Sicilia Guntur Krummel-Garbuna-Welcker Novarupta Saunders Unnamed
Cayambe Hachijojima Krysuvik NW Rota-1 Semeru Veniaminof
Cereme Hakoneyama Kuchinoerabujima Nyamuragira Semisopochnoi Villarrica
Chachadake [Tiatia] Heard Kurikomayama Nyiragongo Seulawah Agam West Mata
Chaiten Hekla Kusatsu-Shiranesan Okataina Sheveluch Westdahl
Chiginagak Helgrindur Kverkfjoll Okmok Shishaldin Whakaari/White Island
Chikurachki Hierro Lamington Ontakesan Simbo Witori
Chiles-Cerro Negro Hokkaido-Komagatake Lamongan Oraefajokull Sinabung Wolf
Chillan, Nevados de Home Reef Langila Osorno Sinarka Yasur
Chirinkotan Hood Lanin Pacaya Siple Zaozan [Zaosan]
Chirpoi Huaynaputina Lascar Pagan Sirung Zavodovski
Cleveland Hudson, Cerro Lateiki Palena Volcanic Group Slamet Zhupanovsky
Colima Huila, Nevado del Lengai, Ol Doinyo Paluweh Snaefellsjokull Zubair Group
Colo Hunga Tonga-Hunga Ha'apai Leroboleng Panarea Soputan
 News Feeds and Google Placemarks


Download Smithsonian / USGS Weekly Volcanic Activity Report Network RSS Feed

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. At the end of each report is a list of the sources used. 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. This feature was first made available on 5 March 2008.



Download Smithsonian / USGS Weekly Volcanic Activity Report Network CAP Feed

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.



Download Smithsonian/USGS Weekly Volcanic Activity Report Network Link Download Smithsonian / USGS Weekly Volcanic Activity Report Network Link

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 profile page and to the complete Weekly Report for that week. This feature was first made available on 1 April 2009.

 Criteria & Disclaimers

Criteria



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.

Disclaimers



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
URL: https://volcano.si.edu/reports_weekly.cfm

 Acronyms and Abbreviations

a.s.l. - above sea level

AVO - Alaska Volcano Observatory

AVHRR - Advanced Very High Resolution Radiometer

CENAPRED - Centro Nacionale de Prevencion de Desastres (México)

CONRED - Coordinadora Nacional para la Reducción de Desastres

COSPEC - Correlation Spectrometer

CVGHM (formerly VSI) - Center of Volcanology and Geological Hazard Mitigation

CVO - Cascades Volcano Observatory (USGS)

GMS - Geostationary Meteorological Satellite

GOES - Geostationary Operational Environmental Satellite

GVO - Goma Volcano Observatory

GVP - Global Volcanism Program (Smithsonian Institution)

HVO - Hawaiian Volcano Observatory (USGS)

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)

JMA - Japanese Meteorological Agency

KEMSD - Kamchatkan Experimental and Methodical Seismilogical Department

KVERT - Kamchatkan Volcanic Eruption Response Team

M - magnitude

METEOSAT - Meteorological Satellite

MEVO - Mount Erebus Volcano Observatory

MODIS - Moderate Resolution Imaging Spectroradiometer

MVO - Montserrat Volcano Observatory

MWO - Meteorological Watch Office

NEIC - National Earthquake Information Center

NIED - National Research Institute for Earth Science and Disaster Prevention (Japan)

NOAA - National Oceanic and Atmospheric Administration

NOTAM - Notice to Airmen

OVDAS - Observatorio Volcanologico de los Andes del Sur (Chile)

OFDA - Office of US Foreign Disaster Assistance

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)

USAID - US Agency for International Development

USGS - United States Geological Survey

UTC - Coordinated Universal Time

VAAC - Volcanic Ash Advisory Center

VAFTAD - Volcanic Ash Forecast Transport And Dispersion

VDAP - Volcano Disaster Assistance Program (USGS)

VHP - Volcano Hazards Program (USGS)

VRC - Volcano Research Center (Japan)

Report for Etna
A large flank eruption began on 17 July at Etna and produced several lava flows that were emitted from four new fissures and strong explosive activity at a fifth. Four of the fissures were on the SE flank, and the fifth was on the NE flank. There were fears that lava flows from two of the fissures would reach the town of Nicolosi (~15 km SSE of the volcano) and a nearby popular tourist area. According to the Italy's Volcanoes website, the 17th eruptive episode in 2001 began on the morning of 17 July and a few hours later a new eruptive fissure opened at the S base of the Southeast Crater cone (see map of fissure locations). Mild Strombolian activity occurred from the fissure and a lava flow extended SSE. During the evening of the 17th a second eruptive fissure emitted an extensive lava flow that spread SE toward the Valle del Bove rim. On 18 July at about 0200 a seismic swarm was accompanied by the opening of a third eruptive fissure at about 2,100 m elevation. Mild Strombolian activity and a sluggish lava flow traveled toward the S. Later in the day the lava flow crossed the main access road to the S flank of Etna and headed towards Nicolosi. A spectator was seriously injured when he fell while trying to avoid projectiles.

On the evening of 18 July the fourth eruptive vent since the episode began opened near 2,700 m elevation on the SE flank. The main explosive activity occurred at this vent, including powerful Strombolian blasts that sent incandescent volcanic bombs as high as 200 m and produced ash columns that rose several kilometers. Lava from this vent progressed towards the tourist complex around the Rifugio Sapienza. On 20 July around 1100 a fifth eruptive fissure became active, but unlike the other fissures it was on the NE flank in the Valle de Leone. Lava emitted from this fissure flowed SE.

By 22 July the lava flow from the third fissure was 4 km away from Nicolosi, but it was advancing very slowly over nearly flat terrain and appeared to have stopped by the next day. Earth barriers were created in an attempt to divert lava from the tourist complex that had already been damaged by volcanic bombs. Continuous ashfall occurred near the explosive fourth vent. The entire area between the towns of Giarre (~17 km E of the volcano) and Catania (~25 km SSE of the volcano) was covered by a thin layer of ash; there was an especially large amount of ash in Catania. The Fontanarossa International Airport of Catania was closed on 22 July and again the next day due to ashfall.

The Toulouse VAAC reported that the new Etna Sistema Poseidon webcam showed ash emission starting on 20 July. The previous webcam had been damaged by earthquakes near the start of the eruption. SE-drifting ash clouds were detected several times on satellite imagery. An ash cloud was reported to have reached a maximum height of ~5.2 km on 22 July. According to news reports, a state of emergency was declared for the area near Etna on 20 July. As of 24 July the eruption was continuing.
Sources: Italy's Volcanoes, Etna Volcan Sicilien (Charles Rivière), Toulouse Volcanic Ash Advisory Centre (VAAC), NASA Earth Observatory, Reuters
Report for Sheveluch
A moderate-sized eruption at Shiveluch on 19 July prompted KVERT to raise the Concern Color Code from Yellow to Orange the same day. The eruption occurred at 1033 and produced an ash plume that rose 3 km above the lava dome. Prior to the eruption, during 14 through 16 July, spasmodic volcanic tremor increased several times. On 15 July at 1803 a three-pixel thermal anomaly was visible on AVHRR satellite imagery near the SW flank of the volcano. Also, at 2100 a gas-and-steam plume was observed rising 1.5 km above the dome.
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Report for Karangetang
During 9-15 July volcanic activity was at a level similar to the previous week. Seismicity was dominated by 572 small explosions, 451 multiphase earthquakes, and continuous lava avalanches. The avalanches traveled up to 2.5 km down the Keting River and lava flowed as far as 750 m down the Kahetang River. In addition, a gray plume was emitted from the volcano, which remained at Alert Level 3 (on a scale of 1-4).
Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Report for Kilauea
During the week lava entered the sea at a moderate rate at the E Kupapa`u entry. On 18 July at 1803 a M 3.5 earthquake rattled though the lower east rift zone of Kilauea. Surface flows were vigorous in two areas of the current lava flow field; one in the E branch of the flow field at the base of the Pulama pali scarp, and the other just SE of the shatter ring in the W branch of the flow field. Generally, weak, steady tremor and a few related long-period earthquakes continued beneath Kilauea's caldera. Near Pu`u `O`o, the tremor alternated from weak, to moderate, to strong over periods of several hours. Elsewhere, seismicity was at normal levels. Tiltmeters in the summit area and along the east rift zone indicated no significant deformation.
Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
Report for Krakatau
There were 728 shallow volcanic earthquakes at Krakatau during 9-15 July, which was a significant increase in comparison to the previous week. No visual observations were made. The volcano remained at Alert Level 2 (on a scale of 1-4).
Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Report for Mayon
Volcanic activity at Mayon was similar to the previous week. During 17-23 July seismicity consisted of four high-frequency and 37 low-frequency earthquakes, and 203 high-frequency short-duration harmonic tremors. An average of 4,100 metric tons per day of SO2 was emitted from the volcano, which was still above the baseline value of 500 metric tons per day. There was an overall deflationary trend and the intensity of incandescence observed at the crater ranged from barely visible to bright. Rockfalls occasionally rolled from the crater SE towards the Bonga Gully. The volcano remained at Alert Level 3 (on a scale of 0-5).
Source: Philippine Institute of Volcanology and Seismology (PHIVOLCS)
Report for Merapi
During 9-15 July volcanic activity at Merapi was similar to the previous week. A total of 52 lava avalanches traveled SW to a maximum distance of 2.5 km down the Sat, Senowo, and Lamat rivers. Emissions from low-pressure fumaroles rose to 755 m above the summit. The volcano remained at Alert Level 2 (on a scale of 1-4).
Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Report for Popocatepetl
Several small-to-moderate sized emissions occurred at Popocatépetl that were mainly composed of steam, gas, and small amounts of ash.
Source: Centro Nacional de Prevencion de Desastres (CENAPRED)
Report for Semeru
Seismic data revealed that during 9-15 July activity was higher than in the previous week. During this period 687 explosion events were recorded, as well as 57 avalanches, and 11 tectonic earthquakes. The volcano remained at Alert Level 2 (on a scale of 1-4).
Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Report for Soufriere Hills
The number of rockfalls increased (719) during 13-20 July in comparison to the previous week (297), although most of them were very small. Near-continuous rockfalls occurred on the S side of the lava dome, where dome growth was concentrated. Numerous pyroclastic flows originated from the S flank of the dome and moved eastward down the Tar River Valley. Several pyroclastic flows also originated from the W side of the dome and traveled short distances into the upper part of the Gages area. On 23 July at 1145 a pilot reported spotting an ash cloud approximately 800 m above the volcano. Satellite imagery at that time detected a faint ash-and-steam plume and an occasional hot spot.
Sources: Montserrat Volcano Observatory (MVO), Washington Volcanic Ash Advisory Center (VAAC)
Report for Tungurahua
During the week heavy rain remobilized ash deposited on the flanks of the volcano, generating lahars, and several small-to-moderate eruptions produced ash clouds. On 19 July lahars that traveled down the W flank of the volcano reached the Baños-Riobamba highway. The Washington VAAC reported that one of the larger eruptions during the week occurred on 20 July at 2104 and produced an ash cloud that rose to ~7.9 km a.s.l.
Sources: Instituto Geofísico-Escuela Politécnica Nacional (IG), Washington Volcanic Ash Advisory Center (VAAC)