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 29 May-4 June 2024
Name	Country	Volcanic Province	Eruption Start Date	Report Status
Bezymianny	Russia	Eastern Kamchatka Volcanic Arc	2022 Mar 15	New
Dempo	Indonesia	Sunda Volcanic Arc	—	New
Kanlaon	Philippines	Negros-Sulu Volcanic Arc	—	New
Kilauea	United States	Hawaiian-Emperor Hotspot Volcano Group	2024 Sep 15	New
Mayon	Philippines	Eastern Philippine Volcanic Arc	—	New
Reykjanes	Iceland	Iceland Neovolcanic Rift Volcanic Province	—	New
Whakaari/White Island	New Zealand	Taupo Volcanic Zone	2024 May 24	New
Aira	Japan	Ryukyu Volcanic Arc	2017 Mar 25	Continuing
Ambae	Vanuatu	Vanuatu Volcanic Arc	—	Continuing
Ambrym	Vanuatu	Vanuatu Volcanic Arc	—	Continuing
Ebeko	Russia	Kuril Volcanic Arc	2022 Jun 11	Continuing
Great Sitkin	United States	Aleutian Ridge Volcanic Arc	2021 May 25	Continuing
Ibu	Indonesia	Halmahera Volcanic Arc	2008 Apr 5	Continuing
Lewotobi	Indonesia	Sunda Volcanic Arc	2023 Dec 23	Continuing
Lewotolok	Indonesia	Sunda Volcanic Arc	—	Continuing
Marapi	Indonesia	Sunda Volcanic Arc	2023 Dec 3	Continuing
Merapi	Indonesia	Sunda Volcanic Arc	2020 Dec 31	Continuing
Sangay	Ecuador	Northern Andean Volcanic Arc	2019 Mar 26	Continuing
Semeru	Indonesia	Sunda Volcanic Arc	2017 Jun 6	Continuing
Sheveluch	Russia	Eastern Kamchatka Volcanic Arc	1999 Aug 15	Continuing
Stromboli	Italy	Aeolian Volcanic Arc	1934 Feb 2	Continuing
Suwanosejima	Japan	Ryukyu Volcanic Arc	2004 Oct 23	Continuing
Yasur	Vanuatu	Vanuatu Volcanic Arc	1270 ± 110 years	Continuing

All times are local unless otherwise stated.

Bezymianny (Russia) | 29 May-4 June 2024 | New Activity / Unrest Cite this Report

Bezymianny
Eastern Kamchatka Volcanic Arc

According to the Tokyo VAAC an ash plume from Bezymianny was identified in satellite images at 1350 on 5 June rising to 5.5 km (18,000 ft) a.s.l. and drifting E. The ash plume had dissipated by 1720.

Source: Tokyo Volcanic Ash Advisory Center (VAAC)

Dempo (Indonesia) | 29 May-4 June 2024 | New Activity / Unrest Cite this Report

Dempo
Sunda Volcanic Arc

PVMBG reported that at 0358 on 31 May an eruption at Dempo generated a whitish ash plume that rose around 200 m above the crater rim and drifted N. The eruption lasted about 39 seconds based on seismic data. According to a news article, Dempo was closed to climbers for a week starting on 2 June. The Alert Level remained at 2 (on a scale of 1-4), and the public were reminded to stay 1 km away from the crater and as far as 2 km on the N flank.

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

Kanlaon (Philippines) | 29 May-4 June 2024 | New Activity / Unrest Cite this Report

Kanlaon
Negros-Sulu Volcanic Arc

PHIVOLCS reported that at 1851 on 3 June an explosive eruption at Kanlaon ejected incandescent material and produced a voluminous ash plume that rapidly rose 5 km above the vent and drifted W. Pyroclastic density currents generated from column collapses traveled 2-3 km down the S and SE flanks based on webcam views. The eruption was recorded by all 10 seismic stations, three infrasound stations, and webcams, and lasted six minutes based on the seismic data. Rumbling was heard in a La Castellana, La Carlota City, and Canlaon City. Coarse ashfall was reported in those same areas and additionally in Bago City. A sulfur odor was also reported in many neighborhoods in the cities of Bago, Bacolod, La Carlota, La Castellana, Murcia, and Canloan City. The Alert Level was raised to 2 (on a scale of 0-5) at 2000 and PHIVOLCS reminded the public to remain outside of the 4-km-radius Permanent Danger Zone. The eruption was preceded by a M 3.5 volcano-tectonic earthquake at 1847. The gas (sulfur dioxide) portion of the plume rose 8-17 km, reaching the upper troposphere based on satellite data.

Abundant gas emissions followed the eruption and then waned by 0820 on 4 June. The emissions likely entrained ash that fell in minor amounts SW of the volcano. Sulfur dioxide emissions averaged 4,113 t/d, the highest gas flux recorded in 2024 and the second highest ever recorded at Kanlaon. According to the National Disaster Risk Reduction and Management Council (NDRRMC), a total of 1,888 people had evacuated to 11 evacuation shelters and a total of eight domestic flights and one international flight were cancelled.

Periodic swarms of volcano-tectonic earthquakes had been recorded since March 2020 and seismicity had been above background levels during the previous month. The report noted that sulfur dioxide emissions had been variable but increasing overall since May 2023 and anomalously high during the 2024, averaging 1,273 tonnes per day (t/d); background levels averaged less than 300 t/d.

Sources: The National Disaster Risk Reduction and Management Council (NDRRMC), Philippine Institute of Volcanology and Seismology (PHIVOLCS), Simon Carn

Kilauea (United States) | 29 May-4 June 2024 | New Activity / Unrest Cite this Report

Kilauea
Hawaiian-Emperor Hotspot Volcano Group

HVO reported that increased seismicity and deformation at Kilauea began at around 1200 on 2 June and likely indicated that magma was rising. Rates of seismicity and deformation increased further after 1700, prompting HVO to raise the Volcano Alert Level to Watch (the third level on a four-level scale) and the Aviation Color Code to Orange (the third color on a four-color scale) at 1731. Activity decreased slightly by 2230 but remained at elevated levels. About 250 earthquakes in total were located beneath the summit region, though in the previous few hours before the Alert Level change, some were located beneath the upper East Rift Zone. The largest earthquakes included a M 4 event recorded at 1907 and a M 4.1 event recorded at 2112. Most events occurred at depths of 2-3 km, though several were located slightly shallower, at a depth of about 1.5. The earthquakes were widely felt in Hawai?i Volcanoes National Park and surrounding communities and triggered many rockfalls.

A new eruption began at around 0030 on 3 June from fissures located in a remote area along the Southwest Rift Zone, about 1-2 km S of the caldera and N of the Koa’e fault system and Hilina Pali Road, within Hawai'i Volcanoes National Park. At 0211 the Volcano Alert Level was raised to Warning and the Aviation Color Code was raised to Red. Incandescence from the eruption was visible in webcam images. During an overflight at 0600 volcanologists observed that four fissures had sequentially propagated from the ENE to WSW. Lava fountaining occurred along the fissure and gas plumes were drifting SW. The eruption was producing a low volume of lava; at 0827 the Volcano Alert Level and Aviation Color Code were lowered to Watch and Orange, respectively. At around 0745 sulfur dioxide emissions averaged 15,000 tonnes per day (t/d), decreased to 12,000 t/d by 1200, and likely decreased further during the afternoon. Earthquake activity in the summit region had greatly decreased with the onset of the eruption; all seismicity during 0700-1500 was concentrated near Maunaiki, at the westernmost fissure segment. Slow summit deflation had started at around 0200 and was ongoing. Lava flows were slow during 1100-1200 and had ceased moving by 1230, indicating that the eruption has ceased or paused. By 1500 volcanic tremor, a signal associated with fluid movement, continued to be recorded on summit seismometers though at a slightly decreased intensity. Gas emissions decreased and by noon on 4 June they averaged 5,500 t/d. Volcanic tremor continued to be recorded on summit seismometers, though earthquake activity and rates of ground deformation remained low in the summit region and upper rift zone areas. Incandescence from the fissures was visible overnight. The most recent eruption in that area occurred in December 1974.

Source: US Geological Survey Hawaiian Volcano Observatory (HVO)

Mayon (Philippines) | 29 May-4 June 2024 | New Activity / Unrest Cite this Report

Mayon
Eastern Philippine Volcanic Arc

The Tokyo VAAC reported that at 1529 on 30 May an ash plume from Mayon rose to 2.7 km (9,000 ft) a.s.l. and drifted N based on information from PHIVOLCS. Ash was not identified in satellite images.

Source: Tokyo Volcanic Ash Advisory Center (VAAC)

Reykjanes (Iceland) | 29 May-4 June 2024 | New Activity / Unrest Cite this Report

Reykjanes
Iceland Neovolcanic Rift Volcanic Province

IMO reported that the fissure eruption that began at 1246 on 29 May near Sundhnúk, NE of Sýlingarfell, within the Reykanes volcanic system, continued to effuse lava during 30 May-4 June. The fissure consisted of several segments and had a total length of 3.4 km. Just before 1600 explosive activity occurred near Hagafell where magma contacted ground water, producing plumes of steam and brownish ash. Based on data collected during an aerial survey the area of new lava was about 8.7 square kilometers and the erupted volume was an estimated 24 million cubic meters by 1706. The active part of the fissure was 2.4 km long by 1910 and continued to produce lava fountains. Lava flows from the fissure segment just S of Hagafell advanced S and W; part of the S flows advanced into a fissure, traveled beneath the surface, and emerged N of the barrier located NE of Grindavík. Lava flowed over Grindavík road towards Mt. Thorbjorn and along the barriers W of Grindavík, inundating part of Nesvegur road.

Activity significantly declined during 29-30 May and the ground surface in the Svartsengi area had subsided about 15 cm. Volcanic tremor stabilized and explosions were not detected since the afternoon of 29 May. IMO warned that the gas plume could impact areas downwind and had received reports of vog in several areas of the country during 29-31 May. During 30-31 May lava flows from the N end of the fissure flowed E, and flows W of Grindavík did not advance. According to a news report the effusion rate had slowed to around 50 cubic meters per second by 31 May. The lava flows minimally advanced and the flow field inflated. Areas of ponded lava were visible. Three cones had built up along the fissure and lava from two or three cones flowed SW and E during 2-3 June based on news articles. Two cones were active on 3 June and sometime during 0200-0300 on 4 June one of the cones ceased to be active. Lava advanced NW towards Sýlingarfell and then flowed N. An additional 4-6 cm of ground subsidence was detected at Svartsengi.

Sources: Icelandic Meteorological Office (IMO), Iceland Monitor, Iceland Monitor

Whakaari/White Island (New Zealand) | 29 May-4 June 2024 | New Activity / Unrest Cite this Report

Whakaari/White Island
Taupo Volcanic Zone

GeoNet reported that no further activity at Whakaari/White Island occurred after 25 May. Typical steam-and-gas emissions were visible on webcam images from the webcam located in Whakatane during 26-31 May when weather conditions allowed for observations. Vivid white steam-and-gas emissions from numerous vents were observed during a 31 May monitoring overflight. No clear signs of emitted ash were seen in webcam images or during the overflight, though GeoNet noted that low-level ash emissions could still have occurred. Gas data collected during the overflight showed elevated levels of magmatic gases compared to observations prior to the eruptions in May. Sulfur dioxide emissions were notably at some of the highest levels since measurements began at the island in 2003. Satellite data from 27 May showed no ground deformation. There are no sensors on the island; GeoNet relies on webcams and satellite imagery, complemented with occasional gas and observation flights. 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

Aira (Japan) | 29 May-4 June 2024 | Continuing ActivityCite this Report

Aira
Ryukyu Volcanic Arc

JMA reported ongoing eruptive activity at Minamidake Crater (Aira Caldera’s Sakurajima volcano) during 27 May-3 June with nighttime crater incandescence. Sulfur dioxide emissions were high, averaging 2,000 tons per day on 30 May. 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)

Ambae (Vanuatu) | 29 May-4 June 2024 | Continuing ActivityCite this Report

Ambae
Vanuatu Volcanic Arc

On 30 May the Vanuatu Meteorology and Geohazards Department (VMGD) reported that steam-and-gas emissions from the active vents at Ambae were ongoing based on both webcam and satellite images. Seismic data also confirmed ongoing unrest. The Alert Level remained at 2 (on a scale of 0-5), and the public was warned to stay outside of the Danger Zone, defined as a 2-km radius around the active vents in Lake Voui, and away from drainages during heavy rains.

Source: Vanuatu Meteorology and Geohazards Department (VMGD)

Ambrym (Vanuatu) | 29 May-4 June 2024 | Continuing ActivityCite this Report

Ambrym
Vanuatu Volcanic Arc

On 30 May the Vanuatu Meteorology and Geo-Hazards Department (VMGD) reported that ongoing small fumarolic steam emissions at Ambrym were coming from both Benbow and Marum craters based on both satellite and webcam images. Seismic data also confirmed ongoing unrest. The Alert Level remained at 2 (on a scale of 0-5). VMGD warned the public to stay outside of Permanent Danger Zone A, defined as a 1-km radius around Benbow Crater and a 2-km radius around Marum Crater, and to stay 500 m away from the ground cracks created by the December 2018 eruption.

Source: Vanuatu Meteorology and Geohazards Department (VMGD)

Ebeko (Russia) | 29 May-4 June 2024 | Continuing ActivityCite this Report

Ebeko
Kuril Volcanic Arc

KVERT reported that moderate explosive activity was ongoing at Ebeko during 23-30 May. A thermal anomaly was identified in satellite images on 30 May; 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)

Great Sitkin (United States) | 29 May-4 June 2024 | Continuing ActivityCite this Report

Great Sitkin
Aleutian Ridge Volcanic Arc

AVO reported that slow lava effusion in Great Sitkin’s summit crater likely continued during 29 May-4 June. Seismicity was low with few daily small earthquakes. Weather clouds mostly obscured satellite and webcam views. Slightly elevated surface temperatures at the summit were identified in satellite images during 3-4 June. 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)

Ibu (Indonesia) | 29 May-4 June 2024 | Continuing ActivityCite this Report

Ibu
Halmahera Volcanic Arc

PVMBG reported that the eruption at Ibu continued during 22-28 May. White steam-and-gas plumes rose 200-600 m above the crater rim and drifted in multiple directions during on 29 May and 3 June. White-and-gray ash plumes rose 200-800 m and drifted in multiple directions during 30-31 May and 3 June. Taller plumes were visible during 1-2 June. At 0323 on 1 June a dense gray-to-black ash plume rose 6 km above the summit and drifted SW and at 1103 on that same day a dense gray plume rose 5 km and drifted SW. A 10-minute-long eruption that began at 1235 on 2 June produced a dense gray-to-black ash plume that rose 7 km above the summit and drifted W. BNPB noted that tephra fell in areas to the W including at the Ibu observation post (9 km W) and in Gam Ici (8.5 km W). At 0303 on 27 May an eruptive event produced a white, gray, and black ash plume that rose 6 km above the crater rim and drifted SW and W. According to a news article ash fell in residential areas and at the Ibu observation post (9 km W). Incandescent material was ejected as far as 1 km from the vent onto the NW, W, SW, and S flanks. The Alert Level remained at 4 (the highest level on a four-level scale) and the public was advised to stay 4 km away from the active crater and 7 km away from the N crater wall opening.

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

Lewotobi (Indonesia) | 29 May-4 June 2024 | Continuing ActivityCite this Report

Lewotobi
Sunda Volcanic Arc

PVMBG reported that eruptive activity at Lewotobi’s Laki-laki volcano continued during 29 May-4 June. White steam-and-gas plumes rose as high as 150 m above the summit and drifted W and SW during 29-30 May; emissions were not observed on 31 May. White, gray, and brown ash plumes rose 100-900 and drifted SW and W during 1-3 June, and ash plumes rose as high as 900 m on 4 June. The Alert Level remained at 2 (the second lowest level on a scale of 1-4) and the public was warned to stay outside of the exclusion zone, defined as a 2-km radius around Laki-laki crater, 3 km to the NNE, and 5 km on the NE flanks.

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

Lewotolok (Indonesia) | 29 May-4 June 2024 | Continuing ActivityCite this Report

Lewotolok
Sunda Volcanic Arc

PVMBG reported that the eruption at Lewotolok continued during 29 May-4 June. White steam-and-gas plumes rose 100-700 m above the summit and drifted W, NW, and SE during 29 and 31 May, 1-2 June, and 4 June. On 30 May and 3 June white-and-gray ash plumes rose as high as 500 m and drifted W and NW. According to a news article, the lava flow had not advanced by 1 June and remained about 1.3 km long. The Alert Level remained at 3 (on a scale of 1-4) and visitors and residents of Lamawolo, Lamatokan, and Jontona were warned to stay 2 km away from the vent and 3 km away from the vent on the S and SE flanks.

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

Marapi (Indonesia) | 29 May-4 June 2024 | Continuing ActivityCite this Report

Marapi
Sunda Volcanic Arc

PVMBG reported that eruptive activity at Marapi (on Sumatra) was ongoing during 29 May-4 June. White gas-and-steam plumes rose 150-400 m above the summit and drifted in multiple directions during 29 May-1 June and on 3 June. An eruptive event at 1304 on 30 May produced a dense gray ash plume that rose 2 km and drifted NW. BNPB noted that a booming noise from the event was heard in areas as far as the Marapi Volcano Observation post in Bukittinggi (12 km NW). White-and-gray ash plumes rose 200-1,000 m above the summit and drifted S, SW, W, and NW on 2 June. The Alert Level remained at 3 (on a scale of 1-4), and the public was warned to stay 4.5 km away from the active crater.

Sources: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM), Badan Nacional Penanggulangan Bencana (BNPB)

Merapi (Indonesia) | 29 May-4 June 2024 | Continuing ActivityCite this Report

Merapi
Sunda Volcanic Arc

BPPTKG reported that the eruption at Merapi (on Java) continued during 17-23 May. Seismicity had decreased compared to the previous week. The SW lava dome produced 138 lava avalanches that traveled as far as 1.9 km down the Bebeng drainage on the SW flank. Morphological changes to the SW lava dome were due to continuing effusion and collapses of material. 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)

Sangay (Ecuador) | 29 May-4 June 2024 | Continuing ActivityCite this Report

Sangay
Northern Andean Volcanic Arc

IG-EPN reported that high levels of eruptive activity continued at Sangay during 28 May-4 June. Daily gas-and-ash plumes visible in webcam and/or satellite images rose as high as 2 km above the summit and drifted NW, W, and SW; ash emissions were not confirmed on 4 June. Weather conditions often hindered views during the week. Minor ashfall was reported in Cebadas del Cantón Guamote (35 km WNW), Provincia Chimborazo on 1 June. Incandescent material at the crater was visible during the dark hours of 28-29 May and 31 May-3 June, and several episodes of incandescent material traveling as far as 1 km down the SE flank were visible during 1-3 June. Secretaría de Gestión de Riesgos (SGR) maintained the Alert Level at Yellow (the second highest level on a four-color scale).

Sources: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN), Secretaría de Gestión de Riesgos (SGR)

Semeru (Indonesia) | 29 May-4 June 2024 | Continuing ActivityCite this Report

Semeru
Sunda Volcanic Arc

PVMBG reported that eruptive activity continued at Semeru during 29 May-4 June. White-and-gray ash plumes that were sometimes dense rose 300-800 m above the summit and drifted in multiple directions on all days except for 31 May. Several additional daily eruptive events were recorded by the seismic network, though plumes were not visually confirmed. A 29 May news article stated that the bridge in Kloposawit had been repaired; it was one of 11 that had been damaged by lahars on 18 April. The Alert Level remained at 3 (the third highest 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.

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

Sheveluch (Russia) | 29 May-4 June 2024 | Continuing ActivityCite this Report

Sheveluch
Eastern Kamchatka Volcanic Arc

KVERT reported that the Karan-1 lava dome on Sheveluch’s SW flank continued to be active during 23-30 May. Thermal anomalies over both the new and older lava domes were identified in satellite images during 23-24 May; the dome was obscured by weather clouds on the other days. 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)

Stromboli (Italy) | 29 May-4 June 2024 | Continuing ActivityCite this Report

Stromboli
Aeolian Volcanic Arc

INGV reported that eruptive activity continued at Stromboli during 27 May-2 June. Webcam images showed Strombolian activity at two vents in Area N (one at N1 and one at N2), within the upper part of the Sciara del Fuoco, and from two vents at S2 in Area C-S (South-Central Crater) on the crater terrace. Intense spattering at a hornito in N1 on 27 May was followed by a short lava flow that descended a few hundred meters in the upper part of the Sciara del Fuoco; a partial collapse of the hornito occurred the day before. During the week low- to medium-intensity explosive activity at N1 and N2 ejected coarse material (bombs and lapilli) less than 150 m above the vents. The average rate of explosions from this area was 11-15 events per hour. Spattering at N1 was almost continuous and intense at times. At Area C-S, explosive activity at two vents in sector S2 ejected both coarse and fine material as high as 150 m above the vent. The average explosion rate was 1-6 events per hour.

Source: Sezione di Catania - Osservatorio Etneo (INGV)

Suwanosejima (Japan) | 29 May-4 June 2024 | Continuing ActivityCite this Report

Suwanosejima
Ryukyu Volcanic Arc

JMA reported that eruptive activity at Suwanosejima's Ontake Crater continued during 27 May-3 June and produced volcanic plumes that rose as high as 500 m above the crater rim. 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)

Yasur (Vanuatu) | 29 May-4 June 2024 | Continuing ActivityCite this Report

Yasur
Vanuatu Volcanic Arc

On 30 May the Vanuatu Meteorology and Geohazards Department (VMGD) reported that activity at Yasur continued at a level of “major unrest,” as defined by the Alert Level 2 status (on a scale of 0-5). Recent visual observations, webcam mages, and photos taken in the field indicated that explosions continued, producing emissions of gas, steam, and/or ash. Gas emissions and weak-to-moderate power thermal anomalies were identified in satellite images during the previous few days. Seismic data indicated that some of the explosions were strong. The report warned that some of the explosions may eject material that falls in and around the crater. The public was reminded to not enter the restricted area within 600 m around the boundaries of the Permanent Exclusion Zone, defined by Danger Zone A on the hazard map.

Source: Vanuatu Meteorology and Geohazards Department (VMGD)

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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.
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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.

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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