Smithsonian / USGS Weekly Volcanic Activity Report

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 and averaging 16 reported volcanoes, this is not a comprehensive list of all eruptions this week, but rather a summary of activity that meet criteria discussed in the "Criteria and Disclaimers" section below.

Volcanic activity reported here is preliminary and subject to change. Carefully reviewed, detailed narratives over longer time periods are published as reports of the Bulletin of the Global Volcanism Network available through volcano profile pages.

Smithsonian / USGS Weekly Volcanic Activity Report for the week of 17 July-23 July 2024
Name	Country	Volcanic Province	Eruption Start Date	Report Status
Bezymianny	Russia	Eastern Kamchatka Volcanic Arc	2016 Dec 5	New
Etna	Italy	Sicily Volcanic Province	—	New
Karymsky	Russia	Eastern Kamchatka Volcanic Arc	—	New
Kilauea	United States	Hawaiian-Emperor Hotspot Volcano Group	—	New
Mayon	Philippines	Eastern Philippine Volcanic Arc	2023 Apr 27 ± 2 days	New
Sumisujima	Japan	Izu Volcanic Arc	—	New
Whakaari/White Island	New Zealand	Taupo Volcanic Zone	—	New
Yellowstone	United States	Yellowstone-Snake River Hotspot Volcano Group	—	New
Aira	Japan	Ryukyu Volcanic Arc	2017 Mar 25	Continuing
Dukono	Indonesia	Halmahera Volcanic Arc	1933 Aug 13	Continuing
Ebeko	Russia	Kuril Volcanic Arc	2022 Jun 11	Continuing
Erta Ale	Ethiopia	Afar Rift Zone	1967 Jul 2 (in or before) ± 182 days	Continuing
Great Sitkin	United States	Aleutian Ridge Volcanic Arc	2021 May 25	Continuing
Home Reef	Tonga	Tofua Volcanic Arc	—	Continuing
Ibu	Indonesia	Halmahera Volcanic Arc	2008 Apr 5	Continuing
Lateiki	Tonga	Tofua Volcanic Arc	—	Continuing
Lewotobi	Indonesia	Sunda Volcanic Arc	2023 Dec 23	Continuing
Marapi	Indonesia	Sunda Volcanic Arc	2023 Dec 3	Continuing
Merapi	Indonesia	Sunda Volcanic Arc	2020 Dec 31	Continuing
Semeru	Indonesia	Sunda Volcanic Arc	2017 Jun 6	Continuing
Sheveluch	Russia	Eastern Kamchatka Volcanic Arc	1999 Aug 15	Continuing
Suwanosejima	Japan	Ryukyu Volcanic Arc	2004 Oct 23	Continuing
Villarrica	Chile	Andean Southern Volcanic Arc	2014 Dec 2 ± 7 days	Continuing

All times are local unless otherwise stated.

Bezymianny (Russia) | 17 July-23 July 2024 | New Activity / Unrest Cite this Report

Bezymianny
Eastern Kamchatka Volcanic Arc

KVERT reported that lava extrusion at Bezymianny significantly increased on 21 July, causing collapses of the E part of the lava dome and subsequent hot avalanches of material. Ash plumes from the collapses rose 2-3 km a.s.l. On 22 July the Aviation Color Code was raised to Orange (the third level on a four-color scale). Activity was sustained at least through 24 July, and by then ash plumes were drifting 70 km SW. Dates and times are reported in UTC; specific events are in local time where noted.

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)

Etna (Italy) | 17 July-23 July 2024 | New Activity / Unrest Cite this Report

Etna
Sicily Volcanic Province

INGV reported that activity at Etna’s summit craters continued during 14-23 July. Explosive activity at both Voragine Crater and NE Crater began to slowly intensify at around 1500 on 14 July and ash emissions from both craters rapidly dispersed. Infrasound data showed increasing activity at NW Crater at around 1600.

Strombolian activity at Voragine Crater persisted on 15 July, and that same day minor ash emissions from Voragine and NE craters were visible in webcam images. Volcanic tremor amplitude values fluctuated at average values for most of the day, then began to increase. Activity at Voragine was observed in infrasound data. Strombolian activity at Voragine slowly intensified beginning around 2100 and volcanic tremor amplitude reached very high levels, peaking at 2140. Activity continued to intensify, and lava fountaining began at 2154. Ash plumes reached about 6 km a.s.l., or about 2.6 km above the summit, and drifted SE. Ashfall was reported in areas downwind including Viagrande (16 km SSE) and Aci Castello (26 km SSE). Lava flowed over the NW rim of Bocca Nuova Crater and descended to about 3,000 m elevation. The average volcanic tremor amplitude remained at very high levels and peaked again at 0100 on 16 July. Infrasound data showed a decrease in the frequency of events. Lava fountaining decreased and had ceased by 0210 on 16 July, though Strombolian activity persisted until around 0500. Reddish ash plumes occasionally rose from NE Crater throughout the day. Strombolian activity at NE Crater began at around 2300 and ejected large bombs several tens of meters above the crater rim. The lava flow continued to be fed though at a low rate.

INGV staff visited the summit area on 17 July and saw Strombolian activity in NE Crater; the activity was also visible in webcam images. The activity produced both fine and coarse material that was ejected tens of meters above the crater rim; the coarser material fell back inside the crater as well as onto the flanks. An explosion at NE Crater at 1956 produced an ash plume that rapidly dispersed.

Strombolian activity at Voragine Crater was again visible in webcam images on 22 July, though weather clouds mostly obscured observations. Volcanic tremor amplitude was low, though gradually increasing, through the day; the amplitude reached a high level by 1745 and remained high. Infrasound data indicated activity in Voragine. The Strombolian activity intensified and was characterized as strong by 0300 on 23 July. Ash emissions rose about the summit, volcanic tremor amplitude increased to very high levels, and by 0508 lava fountaining was underway that resulted in overflows of the Bocca Nuova Crater W rim. Lava fountaining persisted and by 0830 fountains were rising several hundred meters above the crater rim. Ash plumes rose around 8 km a.s.l., or about 4.6 km above the summit, and drifted ESE, then SSE. Ashfall was reported in Rifugio Sapienza (5 km S), Piano Vetore (6 km SSW), C.da Milia, Nicolosi (15 km S), Tremestieri Etneo (20 km SSE), and Catania (29 km SSE). The lava fountaining gradually decreased and then ceased by 1015. The lava flow produced during the activity was small, though due to weather clouds the total length was undetermined.

Source: Sezione di Catania - Osservatorio Etneo (INGV)

Karymsky (Russia) | 17 July-23 July 2024 | New Activity / Unrest Cite this Report

Karymsky
Eastern Kamchatka Volcanic Arc

KVERT reported moderate levels of activity at Karymsky during 11-18 July. A thermal anomaly over the volcano was identified in satellite images on 12, 15, and 18 July; weather clouds obscured views on the other days during the week. The Aviation Color Code remained at Orange (the third level on a four-color scale). Dates are based on UTC times; specific events are in local time where noted.

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)

Kilauea (United States) | 17 July-23 July 2024 | New Activity / Unrest Cite this Report

Kilauea
Hawaiian-Emperor Hotspot Volcano Group

HVO reported that at about 0330 on 23 July increased earthquake activity and abrupt ground deformation around Kilauea’s upper East Rift Zone likely indicated the movement of magma in the subsurface. The Volcano Alert Level was raised to Watch (the third level on a four-level scale) and the Aviation Color Code was raised to Orange (the third color on a four-color scale) at 0406. The seismicity was centered near Pauahi Crater. During 22-23 July there were about 357 earthquakes beneath the upper East Rift Zone mainly at depths of 0-4 km. Most of the events were smaller than M 2, though 13 of the earthquakes were larger with magnitudes of M 3-3.4.

Source: US Geological Survey Hawaiian Volcano Observatory (HVO)

Mayon (Philippines) | 17 July-23 July 2024 | New Activity / Unrest Cite this Report

Mayon
Eastern Philippine Volcanic Arc

PHIVOLCS reported that 0-3 daily rockfalls and volcanic earthquakes at Mayon were detected by the seismic network during 16-22 July. Moderate levels of emissions drifted mainly NW, W, and SW and occasionally ENE. Faint crater incandescence was only visible using a telescope. A phreatic explosion occurred at 1816 on 18 July and lasted for 45 seconds based on seismic data. According to the Tokyo VAAC the plume rose 2.7 km (9,000 ft) a.s.l., or about 280 m above the summit, and drifted WNW. There were 11 rockfalls recorded during 18-19 July. The Alert Level remained at 1 (on a 0-5 scale); the public was reminded to stay out of the 6-km-radius Permanent Danger Zone (PDZ) and pilots were advised to avoid flying close to the summit.

Source: Philippine Institute of Volcanology and Seismology (PHIVOLCS)

Sumisujima (Japan) | 17 July-23 July 2024 | New Activity / Unrest Cite this Report

Sumisujima
Izu Volcanic Arc

The Japan Coast Guard reported that an area of discolored water, brown to yellow-green in color, was visible about 300 m E of the E coast of Sumisujima on 18 July. The report noted that areas of discolored water had occasionally been seen in the vicinity of the island since 2017, though usually characterized as pale blue to white and smaller in size. Sailors were warned to exercise caution in the area.

Source: Japan Coast Guard

Whakaari/White Island (New Zealand) | 17 July-23 July 2024 | New Activity / Unrest Cite this Report

Whakaari/White Island
Taupo Volcanic Zone

GeoNet reported decreasing activity at Whakaari/White Island and confirmed recent activity during overflight observations. A vent on the crater floor increased in diameter by about 20 m sometime during 3-7 July, likely coinciding during a time when larger-than-normal plumes were seen by coastal observers and in webcam images. Impact craters from material ejected during minor explosive activity were scattered as far as 250 m from the active vent based on photographs taken during gas monitoring and observation overflights. A thin ashfall deposit extended across parts of the crater floor. A gas-and-steam plume was continuously emitted from the vent for a period of time on 10 July. During a 12 July overflight the plume contained intermittent and minor amounts of ash likely resulting from erosion inside the vent due to vigorous degassing. During an 18 July overflight GeoNet confirmed that activity had decreased. Gas-and-steam plumes continued to rise from the vent, though with less vigor, and the crater lake had completely dried up. Volcanic gas emissions were decreasing. Steam-and-gas plumes persisted at other vents. The Volcanic Alert Level remained at 2 (on a scale of 0-5) and the Aviation Color Code remained at Yellow (the second level on a four-color scale).

Source: GeoNet

Yellowstone (United States) | 17 July-23 July 2024 | New Activity / Unrest Cite this Report

Yellowstone
Yellowstone-Snake River Hotspot Volcano Group

The Yellowstone Volcano Observatory (YVO) reported that at around 1000 on 23 July a small hydrothermal explosion occurred in Yellowstone’s Biscuit Basin thermal area, located about 3.5 km NW of Old Faithful. The explosion likely originated near Black Diamond Pool and was recorded by visitors that were on the nearby boardwalk. Ejecta from the explosion damaged the boardwalk; no injuries were reported. Biscuit Basin, including the parking lot and boardwalks, were temporary closed for visitor safety. YVO noted that the explosion did not reflect activity within volcanic system, which remained at normal background levels of activity, and was not caused by magma rising towards the surface. Hydrothermal explosions are relatively common in Yellowstone. The Volcano Alert Level remained at Normal (the lowest level on a four-level scale) and the Aviation Color Code remained at Green (the lowest color on a four-color scale).

Source: Yellowstone Volcano Observatory (YVO)

Aira (Japan) | 17 July-23 July 2024 | Continuing ActivityCite this Report

Aira
Ryukyu Volcanic Arc

JMA reported ongoing eruptive activity at Minamidake Crater (Aira Caldera’s Sakurajima volcano) during 15-22 July. Nighttime crater incandescence was sometimes visible and very small eruptive events were occasionally recorded. An explosion at 1358 on 20 July produced an ash plume that rose 3.7 km above the crater rim and drifted NE, and ejected large blocks 600-900 m from the vent. The Alert Level remained at 3 (on a 5-level scale), and the public was warned to stay 1 km away from both craters.

Source: Japan Meteorological Agency (JMA)

Dukono (Indonesia) | 17 July-23 July 2024 | Continuing ActivityCite this Report

Dukono
Halmahera Volcanic Arc

PVMBG reported that the eruption at Dukono was ongoing during 17-23 July. Gray-and-white ash plumes rose 100-400 m above the summit and drifted E on 17 July. Emissions were not observed during 18-21 July, and dense white plumes rose 200-600 m and drifted NW on 22 July. The Alert Level remained at Level 2 (on a scale of 1-4), and the public was warned to remain outside of the 3-km exclusion zone.

Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)

Ebeko (Russia) | 17 July-23 July 2024 | Continuing ActivityCite this Report

Ebeko
Kuril Volcanic Arc

KVERT reported that moderate explosive activity was ongoing at Ebeko during 11-18 July. According to volcanologists in Severo-Kurilsk (Paramushir Island, about 7 km E), explosions during 15-18 July generated ash plumes that rose as high as 3 km (10,000 ft) a.s.l. and drifted E, NE, and S. Thermal anomalies were identified in satellite images on 18 July; on other days either no activity was observed or weather conditions prevented views. The Aviation Color Code remained at Orange (the third level on a four-color scale). Dates are UTC; specific events are in local time where noted.

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)

Erta Ale (Ethiopia) | 17 July-23 July 2024 | Continuing ActivityCite this Report

Erta Ale
Afar Rift Zone

Thermal anomalies in satellite images of Erta Ale on 11, 16, and 21 July suggested that lava flows from the S pit crater traveled about 870 m SSE.

Source: Copernicus

Great Sitkin (United States) | 17 July-23 July 2024 | Continuing ActivityCite this Report

Great Sitkin
Aleutian Ridge Volcanic Arc

AVO reported that slow lava effusion in Great Sitkin’s summit crater was last confirmed in an 18 July radar image and that same day elevated surface temperatures were detected in satellite images; effusion likely continued during 19-23 July. The lava flow expanded E and S, overtopping older lava flows emplaced during 2022-2024. Lava blocks sometimes detached from the flow and descended the flow margins; the tumbling blocks were seismically detected. Small daily earthquakes beneath the volcano were recorded during 16-23 July. Weather conditions often obscured satellite and webcam views. The Volcano Alert Level remained at Watch (the third level on a four-level scale) and the Aviation Color Code remained at Orange (the third color on a four-color scale).

Source: US Geological Survey Alaska Volcano Observatory (AVO)

Home Reef (Tonga) | 17 July-23 July 2024 | Continuing ActivityCite this Report

Home Reef
Tofua Volcanic Arc

A 20 July satellite image of Home Reef showed a N-S-elongated thermal anomaly over the vent area.

Source: Copernicus

Ibu (Indonesia) | 17 July-23 July 2024 | Continuing ActivityCite this Report

Ibu
Halmahera Volcanic Arc

PVMBG reported that activity at Ibu continued during 17-23 July. Daily white-and-gray or white, gray, and black ash plumes rose 100-1,200 m above the summit and drifted in multiple directions. The Alert Level remained at 3 (the second highest level on a four-level scale) and the public was advised to stay 4 km away from the active crater and 5 km away from the N crater wall opening.

Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)

Lateiki (Tonga) | 17 July-23 July 2024 | Continuing ActivityCite this Report

Lateiki
Tofua Volcanic Arc

Satellite data showed an area of discolored water in the vicinity of the submarine Lateiki volcano drifting about 1.2 km SW on 20 July. Weather clouds obscured part of the area.

Source: Copernicus

Lewotobi (Indonesia) | 17 July-23 July 2024 | Continuing ActivityCite this Report

Lewotobi
Sunda Volcanic Arc

PVMBG reported that eruptive activity at Lewotobi’s Laki-laki volcano continued during 3-9 July. Multiple daily gray or white-and-gray ash plumes that were sometimes dense rose 50-1,500 m above the summit and drifted SW, W, and NW. According to a news article, several villages were impacted by ashfall on 22 July, including Wolorona (5 km WNW), Klatanlou (4 km NW), Goliriang, Hokeng (3 km WNW), Pululera (6 km NW), Padang Pasir (5 km NW), Boru (8 km WNW), Wotupudor, and Kumaebang. The Alert Level remained at 3 (the second highest level on a scale of 1-4) and the public was warned to stay outside of the exclusion zone, defined as a 3-km radius around both Laki-laki and Perempuan craters, 4 km to the NNW and SSE of Laki-laki.

Sources: Antara News, Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)

Marapi (Indonesia) | 17 July-23 July 2024 | Continuing ActivityCite this Report

Marapi
Sunda Volcanic Arc

PVMBG reported that eruptive activity at Marapi (on Sumatra) was ongoing during 17-23 July. White gas-and-steam plumes rose 100-250 m above the summit and drifted NE, E, and S during 17-18 and 20 July. Gray ash plumes rose 150 m above the summit and drifted NE and E on 19 July. Emissions were not observed on the other days. The Alert Level remained at 2 (on a scale of 1-4), and the public was warned to stay 3 km away from the active crater.

Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)

Merapi (Indonesia) | 17 July-23 July 2024 | Continuing ActivityCite this Report

Merapi
Sunda Volcanic Arc

BPPTKG reported that the eruption at Merapi (on Java) continued during 12-18 July. Earthquakes were less intense compared to the previous week. The SW lava dome produced 177 lava avalanches that traveled as far as 2 km down the upper part of the Bebeng drainage on the SW flank and 1.1 km down the Bedog drainage on the SSW flank. Morphological changes to the SW lava dome were due to continuing effusion and collapses of material. The volume of the SW dome was an estimated 2,516,600 cubic meters and the dome in the main crater was stable at an estimated 2,360,700 cubic meters based on an 18 July drone survey and webcam images. The highest temperature of the SW dome was around 245 degrees Celsius, higher than the previous measurement. The Alert Level remained at 3 (on a scale of 1-4), and the public was warned to stay 3-7 km away from the summit, based on location.

Source: Balai Penyelidikan dan Pengembangan Teknologi Kebencanaan Geologi (BPPTKG)

Semeru (Indonesia) | 17 July-23 July 2024 | Continuing ActivityCite this Report

Semeru
Sunda Volcanic Arc

PVMBG reported that eruptive activity continued at Semeru during 17-23 July. White-and-gray ash plumes that were sometimes dense rose 400-1,000 m above the summit and drifted mainly S and SW and sometimes N and NE. Daily eruptive events, sometimes several per day, were recorded by the seismic network, though plumes were not always visually confirmed. The Alert Level remained at 2 (the second lowest level on a scale of 1-4). The public was warned to stay at least 5 km away from the summit in all directions, 13 km from the summit to the SE, 500 m from the banks of the Kobokan drainage as far as 17 km from the summit, and to avoid other drainages including the Bang, Kembar, and Sat, due to lahar, avalanche, and pyroclastic flow hazards.

Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)

Sheveluch (Russia) | 17 July-23 July 2024 | Continuing ActivityCite this Report

Sheveluch
Eastern Kamchatka Volcanic Arc

KVERT reported that thermal anomalies over both the “300 years of RAS” dome and the older lava dome at Sheveluch were identified in satellite images during 12-15 and 18 July. Weather conditions prevented views on the other days during 12-19 July. The Aviation Color Code remained at Orange (the third level on a four-color scale). Dates are based on UTC times; specific events are in local time where noted.

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)

Suwanosejima (Japan) | 17 July-23 July 2024 | Continuing ActivityCite this Report

Suwanosejima
Ryukyu Volcanic Arc

JMA reported that eruptive activity at Suwanosejima's Ontake Crater continued during 15-22 July and produced volcanic plumes that rose as high as 1.2 km above the crater rim and drifted N and NW. Large blocks were ejected as far as 300 m from the vent, though no explosions were recorded. Crater incandescence was observed nightly in webcam images. The Alert Level remained at 2 (on a 5-level scale) and the public was warned to stay at least 1.5 km away from the crater.

Source: Japan Meteorological Agency (JMA)

Villarrica (Chile) | 17 July-23 July 2024 | Continuing ActivityCite this Report

Villarrica
Andean Southern Volcanic Arc

After field observations and analysis of data, Servicio Nacional de Geología y Minería (SERNAGEOMIN) reduced the exclusion zone around Villarrica to 1.5 km on 19 July. SENAPRED maintained the Alert Level at Yellow (the middle level on a three-color scale) for the communities of Villarrica, Pucón (16 km N), Curarrehue, and Panguipulli. Two ash emissions were recorded at 1346 and 1349 on 21 July and drifted NE. The second ash plume rose 320 m above the crater rim and was associated with a long-period earthquake. Another ash emission event at 1438 was also associated with a long-period earthquake; the plume rose 780 m above the crater rim and drifted NE.

Sources: Servicio Nacional de Geología y Minería (SERNAGEOMIN), Sistema y Servicio Nacional de Prevención y Repuesta Ante Desastres (SENAPRED)

Weekly Reports Archive

Since the Weekly Volcanic Activity Report began in November 2000, there have been 20,322 individual reports over 1,229 weeks (average of 17 per week) on 336 different volcanoes.

Search by Date

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

Search by Volcano

Puyehue-Cordon Caulle

Dieng Volcanic Complex

Antillanca Volcanic Complex

Atka Volcanic Complex

Etorofu-Yakeyama [Grozny Group]

Fournaise, Piton de la

Moyorodake [Medvezhia]

Krummel-Garbuna-Welcker

Krysuvik-Trolladyngja

Nyiragongo

Sheveluch

Villarrica

Campi Flegrei del Mar di Sicilia

Whakaari/White Island

Palena Volcanic Group

Soufriere St. Vincent

Zavodovski

Colo

Hunga Tonga-Hunga Ha'apai

Leroboleng

Pelee

South Sarigan Seamount

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

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 cover longer time periods and are 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