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 11 June-17 June 2003
Name	Country	Volcanic Province	Eruption Start Date	Report Status
Anatahan	United States	Mariana Volcanic Arc	—	Continuing
Chikurachki	Russia	Kuril Volcanic Arc	—	Continuing
Dukono	Indonesia	Halmahera Volcanic Arc	1933 Aug 13	Continuing
Etna	Italy	Sicily Volcanic Province	—	Continuing
Kilauea	United States	Hawaiian-Emperor Hotspot Volcano Group	—	Continuing
Klyuchevskoy	Russia	Eastern Kamchatka Volcanic Arc	—	Continuing
Lewotobi	Indonesia	Sunda Volcanic Arc	2023 Dec 23	Continuing
Lopevi	Vanuatu	Vanuatu Volcanic Arc	—	Continuing
Piton de la Fournaise	France	Reunion Hotspot Volcano Group	—	Continuing
Popocatepetl	Mexico	Trans-Mexican Volcanic Belt	2005 Jan 9	Continuing
Soufriere Hills	United Kingdom	Lesser Antilles Volcanic Arc	—	Continuing
Stromboli	Italy	Aeolian Volcanic Arc	1934 Feb 2	Continuing
Tungurahua	Ecuador	Andean Northern Volcanic Arc	—	Continuing

All times are local unless otherwise stated.

Anatahan (United States) | 11 June-17 June 2003 | Continuing ActivityCite this Report

Anatahan
Mariana Volcanic Arc

As of 17 June, continuous ash-and-gas emissions persisted at Anatahan. US Geological Survey and CNMI Emergency Management Office personnel observed the volcano on 12 June. They noted that a lava dome or flow was visible on the crater floor and ash was emitted from several areas. No sound emanated from the crater, spines were visible on the crater floor, and one source for the convecting ash cloud was located on the E side of the east crater. In addition, the east crater seemed deeper than during the previous visit on 6 June. During 5-12 June, the seismic record only contained banded-volcanic tremor, but on the evening of 12 June long-period (M ~2) earthquakes began to be recorded. An explosion earthquake occurred on 14 June at 0010. Scientists believe the earthquake was associated with an explosion that removed much of the small lava dome, because the dome was no longer seen during an overflight on the 14th. After the explosion, a series of long-period earthquakes occurred at regular 1- to 2-minute intervals until ~1400. During the report period, ash was visible on satellite imagery rising to a maximum height of ~3 km a.s.l.

Sources: Washington Volcanic Ash Advisory Center (VAAC), Emergency Management Office of the Commonwealth of the Mariana Islands and United States Geological Survey Volcano Hazards Program

Chikurachki (Russia) | 11 June-17 June 2003 | Continuing ActivityCite this Report

Chikurachki
Kuril Volcanic Arc

The eruption at Chikurachki that began on 18 April continued through 13 June, with ash plumes rising to heights less than 500 m above the volcano. During the report week, ash fell on the Podgorny settlement, ~20 km SSE of the volcano, and narrow plumes were visible on satellite imagery. Chikurachki remained at Concern Color Code Orange.

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)

Dukono (Indonesia) | 11 June-17 June 2003 | Continuing ActivityCite this Report

Dukono
Halmahera Volcanic Arc

Ash continued to be emitted from Dukono during 11-17 June, with plumes rising to a maximum height of ~4.5 km a.s.l.

Source: Darwin Volcanic Ash Advisory Centre (VAAC)

Etna (Italy) | 11 June-17 June 2003 | Continuing ActivityCite this Report

Etna
Sicily Volcanic Province

The Toulouse VAAC reported that the Etna web video camera showed an ash plume below ~4 km a.s.l. drifting SE on 7 June. According to the Italy's Volcanoes website, in early June intense gas emissions took place from Northeast Crater, often feeding a plume that extended tens of kilometers. At Bocca Nuova crater strong gas emissions and occasional strong explosions occurred, but no fresh volcanic material was ejected beyond the pit. Gas was emitted from two pits in Voragine crater. There was a progressive increase in the number and activity of fumaroles near Southeast Crater's summit and the S flank.

Sources: Italy's Volcanoes, Toulouse Volcanic Ash Advisory Centre (VAAC)

Kilauea (United States) | 11 June-17 June 2003 | Continuing ActivityCite this Report

Kilauea
Hawaiian-Emperor Hotspot Volcano Group

At Kilauea lava continued to enter the sea mainly at the Highcastle ocean entry during 11-17 June and surface lava flows were visible on the coastal flat and Pulama pali. Seismicity at the summit was at moderate-to-high levels, with many small, low-frequency earthquakes occurring at shallow depths beneath the summit caldera for the past two weeks. Little or no volcanic tremor accompanied the swarm, however. Volcanic tremor at Pu`u `O`o remained at moderate-to-high levels, as is the norm. A quasi-cyclic tilt pattern ended at Kilauea's summit and Pu`u `O`o on the 13th after lasting about a week.

Source: US Geological Survey Hawaiian Volcano Observatory (HVO)

Klyuchevskoy (Russia) | 11 June-17 June 2003 | Continuing ActivityCite this Report

Klyuchevskoy
Eastern Kamchatka Volcanic Arc

Seismicity was above background levels at Kliuchevskoi during 6-13 June. After some diminishing, the level of continuous spasmodic volcanic tremor returned to the same level as the previous week. Earthquakes continued to be registered at depths around 30 km and at shallower levels. The character of seismicity indicated that weak gas-and-ash explosions possibly occurred. A thermal anomaly and an ash-poor plume were visible on satellite imagery. Kliuchevskoi remained at Concern Color Code Orange.

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)

Lewotobi (Indonesia) | 11 June-17 June 2003 | Continuing ActivityCite this Report

Lewotobi
Sunda Volcanic Arc

On 30 May at 1650 an ash explosion at Lewotobi Lakilaki, a stratovolcano of Lewotobi, sent an ash column to a height of ~200 m above the summit. Ash fell at the observatory post about 5 km from the crater. As of 1 June, Lewotobi was at Alert Level 2 (on a scale of 1-4).

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

Lopevi (Vanuatu) | 11 June-17 June 2003 | Continuing ActivityCite this Report

Lopevi
Vanuatu Volcanic Arc

The eruption that began at Lopevi on 9 June continued through at least 14 June. An airport in Vanuatu reported to the Wellington VAAC that a thick plume rose to ~7.5 km a.s.l. on 11 June. The plume drifted SE and was ~9 km in diameter. They reported that on 13 June a ~9-km-diameter plume rose to ~2.5 km a.s.l. Also, on 14 June an ash cloud was at a height of ~2.5 km a.s.l. and a thin lava flow was visible on the volcano's W flank. A news article stated that the eruption of Lopevi was causing acid rain to fall on island villages in Vanuatu that are close to the volcano. Local disaster management personnel warned residents of the islands of Paama, Epi, and villages in SE Ambryn to secure their rain-based water supplies.

Sources: ABC News - Australian Broadcasting Corporation, Wellington Volcanic Ash Advisory Center (VAAC)

Piton de la Fournaise (France) | 11 June-17 June 2003 | Continuing ActivityCite this Report

Piton de la Fournaise
Reunion Hotspot Volcano Group

The second phase of an eruption that began on 30 May in the Dolomieu crater of Piton de la Fournaise ended on 6 June. Numerous seismic events were recorded during the following days until the morning of 12 June. On 13 June at 0308 eruption tremor again began within Dolomieu crater, marking the beginning of the third phase of the eruption. Eruptive activity resumed in the same area as the previous two phases. By 15 June no tremor was recorded, possibly marking the end of the third phase.

Source: Observatoire Volcanologique du Piton de la Fournaise (OVPF)

Popocatepetl (Mexico) | 11 June-17 June 2003 | Continuing ActivityCite this Report

Popocatepetl
Trans-Mexican Volcanic Belt

CENAPRED reported that a small eruption at Popocatépetl on 10 June at 1744 produced a W-drifting ash column to a height of ~3 km above the volcano. In addition, episodes of low-amplitude harmonic tremor were recorded for a total of 2 hours. According to the Washington VAAC, the volcano returned to just gas venting after the eruption. Based on information from the México City MWO, the Washington VAAC also reported that a small emission occurred on 15 June at 1401. Aviators reported that the cloud from this eruption rose to ~2 km above the volcano and drifted N.

Sources: Centro Nacional de Prevencion de Desastres (CENAPRED), Washington Volcanic Ash Advisory Center (VAAC)

Soufriere Hills (United Kingdom) | 11 June-17 June 2003 | Continuing ActivityCite this Report

Soufriere Hills
Lesser Antilles Volcanic Arc

Volcanic activity at Soufrière Hills decreased to low levels during 6-13 June, with sporadic rockfalls and pyroclastic flows traveling down the volcano's E and NE flanks to the Tar River Valley, and White's and Tuitt's ghauts. Several energetic pyroclastic flows occurred in the Tar River Valley in the early hours of 11 June and again on the morning of 13 June.

Source: Montserrat Volcano Observatory (MVO)

Stromboli (Italy) | 11 June-17 June 2003 | Continuing ActivityCite this Report

Stromboli
Aeolian Volcanic Arc

INGV-CT reported that the effusive eruption that began at Stromboli on 15 February on the upper eastern corner of the Sciara del Fuoco (a horseshoe-shaped scarp) continued until at least 16 June, with a general decrease in lava-effusion rate. During 1-6 June, there was Strombolian activity at Crater 1 (the NE crater). Most ejecta fell within the crater and pulsating dark ash was emitted. On 11 June lava flows were occasionally emitted from hornitos at 600-m elevation. Discontinuous ash emission occurred from the summit crater until mid-June. On 15 June a SAR fixed camera recorded a Strombolian explosion, with abundant ash emissions.

Source: Sezione di Catania - Osservatorio Etneo (INGV)

Tungurahua (Ecuador) | 11 June-17 June 2003 | Continuing ActivityCite this Report

Tungurahua
Andean Northern Volcanic Arc

Relatively high volcanic activity continued at Tungurahua during 10-17 June. Several explosions took place, with the highest rising ash plume reaching ~5 km above Tungurahua. Some explosions were heard in towns near the volcano and on 10 June vibrations from an explosion were felt in the town of Baños. Significant amounts of ash fell in several villages, including Quero and Pelileo. Strombolian activity during the evening of 15 June consisted of incandescent blocks that were hurled to ~150 m above the crater and rolled ~1 km down Tungurahua's N flank. Ash fell in the sector of Cusúa. During the report week, ash clouds were visible on satellite imagery.

Sources: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN), Washington Volcanic Ash Advisory Center (VAAC)

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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.

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