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Smithsonian / USGS Weekly Volcanic Activity Report

Weekly Volcanic Activity Map

You are currently viewing Archived reports for the week of 9 July-15 July 2014.

 Activity for the week of 9 July-15 July 2014

The Weekly Volcanic Activity Report is a cooperative project between the Smithsonian's Global Volcanism Program and the US Geological Survey's Volcano Hazards Program. Updated by 2300 UTC every Wednesday, notices of volcanic activity posted on these pages are preliminary and subject to change as events are studied in more detail. This is not a comprehensive list of all of Earth's volcanoes erupting during the week, but rather a summary of activity at volcanoes that meet criteria discussed in detail in the "Criteria and Disclaimers" section. Carefully reviewed, detailed reports on various volcanoes are published monthly in the Bulletin of the Global Volcanism Network.

Name Location Activity
Ambang Sulawesi (Indonesia) New
Bulusan Luzon (Philippines) New
Copahue Central Chile-Argentina border New

Aira Kyushu (Japan) Ongoing
Bezymianny Central Kamchatka (Russia) Ongoing
Dukono Halmahera (Indonesia) Ongoing
Etna Sicily (Italy) Ongoing
Fuego Guatemala Ongoing
Karymsky Eastern Kamchatka (Russia) Ongoing
Kilauea Hawaiian Islands (USA) Ongoing
Merapi Central Java (Indonesia) Ongoing
Nishinoshima Japan Ongoing
Pacaya Guatemala Ongoing
Popocatepetl Mexico Ongoing
Reventador Ecuador Ongoing
Sabancaya Peru Ongoing
San Miguel El Salvador Ongoing
Santa Maria Guatemala Ongoing
Sheveluch Central Kamchatka (Russia) Ongoing
Shishaldin Fox Islands (USA) Ongoing
Sinabung Indonesia Ongoing
Slamet Central Java (Indonesia) Ongoing
Stromboli Aeolian Islands (Italy) Ongoing
Tungurahua Ecuador Ongoing
Ubinas Peru Ongoing
Zhupanovsky Eastern Kamchatka (Russia) Ongoing

New Activity / Unrest

Volcano index photo  Ambang  | Sulawesi (Indonesia)  | 0.75°N, 124.42°E  | Elevation 1795 m

On 3 July, CVGHM reported a significant increase in seismicity from Ambang, particularly shallow earthquakes (VB). During 1 June-2 July, 7-9 shallow volcanic (VB) and 2-9 deep volcanic (VA) earthquakes were detected per week, for totals of 33 VB and 29 VA earthquakes in that time. The Alert Level was raised to Level 2 on 3 July. An exclusion zone was placed around the crater with a radius of 1.5 km. Persistent diffuse gas emissions were observed reaching 10-25 m above the crater.

CVGHM noted that previous eruptions were dominated by effusive lava flows and were punctuated by explosive eruptions producing pyroclastic flows and fallout. The last event recorded at Ambang was a phreatic explosion in 2005; a persistent fumarolic field remains from that activity. CVGHM noted that a magmatic eruption generating pyroclastic flows would threaten communities SE of the summit including the villages of Bongkudai, Goaan, Purworejo, and Modayong.

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

Volcano index photo  Bulusan  | Luzon (Philippines)  | 12.769°N, 124.056°E  | Elevation 1535 m

On 13 July, PHIVLOCS reported that several days of elevated seismicity at Bulusan continued. During the previous 24 hours, 13 volcanic earthquakes were recorded by the local network. GPS and leveling surveys determined that the volcano was slightly inflated. Alert Level 0 and the 4-km restricted zone, the Permanent Danger Zone (PDZ), were maintained due to the possibility of sudden and hazardous steam-driven or phreatic eruptions.

Source: Philippine Institute of Volcanology and Seismology (PHIVOLCS)

Volcano index photo  Copahue  | Central Chile-Argentina border  | 37.856°S, 71.183°W  | Elevation 2953 m

SERNAGEOMIN reported that a phreatic explosion from Copahue occurred at 2023 on 4 July that deposited bombs (less than 12 cm in diameter), lapilli (less than 4 cm), ash, and gray clay smelling strongly of sulfuric acid along the E flank of the crater. During an overflight on 7 July, OVDAS officials observed the deposit and measured a moderate amount of gas emissions (an average of 4,000 tons per day of SO2), a relatively low level of water in the crater, and low temperatures of the fumaroles within El Agrio crater. DOAS stations had measured up to 18,000 tons/day of SO2 on the day of the explosion. An anomalous tremor signal was detected at 0823 on 5 July that was associated with an explosion from El Agrio crater; a microphone installation 13 km E also detected an acoustic signal. The explosion generated a plume 1,000 m above the crater. The Alert Level remained at Yellow.

Source: Servicio Nacional de Geología y Minería (SERNAGEOMIN)

Ongoing Activity

Volcano index photo  Aira  | Kyushu (Japan)  | 31.593°N, 130.657°E  | Elevation 1117 m

During 11-14 July, JMA reported four large explosions that ejected deposits 800-1,300 m from Showa crater. Volcanic earthquakes decreased and tremor continued. The Tokyo VAAC reported that during 3-14 July plumes rose to altitudes of 2-3 km (7,000-10,000 ft) a.s.l. and drifted NE, SE, and E. The Alert Level remained at 3 (on a scale of 1-5).

Sources: Japan Meteorological Agency (JMA), Tokyo Volcanic Ash Advisory Center (VAAC)

Volcano index photo  Bezymianny  | Central Kamchatka (Russia)  | 55.972°N, 160.595°E  | Elevation 2882 m

KVERT reported that Bezymianny’s activity continued during 2-10 July; shallow earthquakes were registered. Satellite data showed the volcano frequently obscured by clouds. The Aviation Color Code remained at Orange.

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)

Volcano index photo  Dukono  | Halmahera (Indonesia)  | 1.693°N, 127.894°E  | Elevation 1229 m

Based on analyses of satellite imagery and wind data, the Darwin VAAC reported that on 12-15 July ash plumes from Dukono rose to an altitude of 2-3 km (7,000-10,000 ft) a.s.l. and drifted NE.

Source: Darwin Volcanic Ash Advisory Centre (VAAC)

Volcano index photo  Etna  | Sicily (Italy)  | 37.748°N, 14.999°E  | Elevation 3320 m

INGV reported that a new, small fissure (tens of meters long) developed on the E flank of Etna during 5-6 July. The vent was located around 3,015-3,025 m elevation. Weak spattering from this vent fed a lava flow that extended ~100 m within the saddle of the NE and SE craters and cones. Weak and sporadic strombolian explosions and small ash emissions were observed during 6-7 July from New SE Crater, but by 11 July this activity had ceased.

Activity from the new fissure continued through 11 July with frequent strombolian explosions that were audible in nearby towns. The lava flow diverged, and the longest of the two branches extended ~1.5 km, reaching the bottom of Valle del Leone.

Source: Sezione di Catania - Osservatorio Etneo (INGV)

Volcano index photo  Fuego  | Guatemala  | 14.473°N, 90.88°W  | Elevation 3763 m

During 30 June-14 July, INSIVUMEH frequently reported a white fumarolic plume rising from Fuego’s summit extending up to 4,000 m (13,123 ft) a.s.l.. Weak-to-moderate explosions generated ash plumes to similar heights during 30 June and 1, 4, 6, 7, and 9-13 July. Rumbling and jetting sounds often accompanied these explosions, often with durations of 1-5 minutes. Pulses of incandescence reached 50-100 m above the rim on 30 June, and 6, 7, and 12 July. Remobilized ash reduced visibility on 4, 9, and 10 July. Surges of lava and incandescent avalanches traveled from the summit down the flanks on 1 July (~150 m into the Trinidad drainage), 6 July (100 m into Taniluya and 200 m into the Ceniza), 11 July (~100 m into Taniluya), 12 July (Santa Teresa, Taniluya, Ceniza, Trinidad, Las Lajas, and Honda), and 13 July (~400 m into the Ceniza).

Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)

Volcano index photo  Karymsky  | Eastern Kamchatka (Russia)  | 54.049°N, 159.443°E  | Elevation 1513 m

KVERT reported that Strombolian activity continued at Karymsky during 3-10 July. Satellite views were obscured by clouds or the imagery showed no activity. The Aviation Color Code remained at Orange.

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)

Volcano index photo  Kilauea  | Hawaiian Islands (USA)  | 19.421°N, 155.287°W  | Elevation 1222 m

During 2-14 July HVO reported that the circulating lava lake occasionally rose and fell in the deep pit within Kilauea's Halema`uma`u Crater. The lava-lake level fluctuated between 30 and 45 m below the Overlook crater rim; on 13 July, the level dropped 45-50 m during periods of spattering. Weak inflation was measured at the summit during 2-8 July, deflation during 9-10 July, no significant deformation during 11-13 July, and slight inflation on 14 July. Gas emissions remained elevated; during the weeks ending on 1 and 8 July, the summit SO2 emission rates were 3,800-8,400 tonnes/day and 5,800-6,900 tonnes/day, respectively. Earthquakes during 2-7 July (11-21/day) and 8-14 July (5-27/day) were strong enough to be located beneath Kilauea. The plume from the vent continued to deposit variable amounts of ash, spatter, and Pele's hair onto nearby areas; smaller particles may have been dropped several kilometers away.

On 3 July, the total SO2 emission rate from all East Rift Zone sources was 500 tonnes per day. During 2-14 July, four lava ponds within cones occupied the crater floor of Pu`u`O`o. The vent which opened on the NE flank of Pu`u`O`o on 27 June remained active and supplied a flow extending NE, constructing a lava shield that continued to expand until 10 July. This new flow cut off lava supply to the Kahauale`a 2 flow, which by 3 July was no longer active. The new shield developed a perched lava pond which crusted over and became quiescent when the pond spilled over on 11 July. Lava continued to erupt from the base of the structure, supplying flows that accumulated around the flat-lying terrain at the base of Pu`u`O`o until 14 July. Continuous deflation was measured at Pu`u`O`o.

Source: US Geological Survey Hawaiian Volcano Observatory (HVO)

Volcano index photo  Merapi  | Central Java (Indonesia)  | 7.54°S, 110.446°E  | Elevation 2910 m

PVMBG reported that during 4-10 July seismicity at Merapi fluctuated at normal levels. Deformation measurements showed general inflation. Solfatara plumes rose 450 m above the summit on 4 July. The Alert Level remained at 1 (on a scale of 1-4).

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

Volcano index photo  Nishinoshima  | Japan  | 27.247°N, 140.874°E  | Elevation 25 m

Tokyo VAAC reported volcanic ash from Nishinoshima at 3 km (10,000 ft) a.s.l. at 2203 on 30 June; the plume extended NE. However, ash was not visible in satellite images. The University of Hawaii reported that Moderate Resolution Imaging Spectroradiometer (MODIS) satellite data detected thermal anomalies and issued MODVOLC alerts during 25 June-13 July with the exceptions of 8, 11, and 12 July.

Sources: Hawai'i Institute of Geophysics and Planetology (HIGP) Thermal Alerts Team, Tokyo Volcanic Ash Advisory Center (VAAC)

Volcano index photo  Pacaya  | Guatemala  | 14.382°N, 90.601°W  | Elevation 2569 m

INSIVUMEH reported that on most days during 30 June-13 July, fumarolic plumes rose above Pacaya and drifted up to 1 km W, SW, and S. Associated seismicity was notable on 4, 6, 9-11, and 13 July. Elevated seismicity on 10 July corresponded to minor explosions from Mackenney Crater.

Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)

Volcano index photo  Popocatepetl  | Mexico  | 19.023°N, 98.622°W  | Elevation 5393 m

CENAPRED reported that during 24 June-15 July, seismicity at Popocatépetl indicated continuing emissions of water vapor, gas, and occasional small amounts of ash. Cloud cover sometimes prevented visual observations. Slight nighttime incandescence was observed during 25 and 26 June and also during 1-3, 6-8, and 10-15 July. Explosions from the summit were detected an average of 10 times each day, producing plumes with minor ash content that rose 500-2,500 m above the crater and drifted NE and NW. Activity increased in early July; up to 216 explosions (low and moderate intensity) were detected over 24 hours on 9 July. CENAPRED reported harmonic tremor on 2 July (maximum of 80 minutes in 24 hours) and 12 July (minimum of 8 minutes). The Alert Level remained at to Yellow, Phase Two.

Source: Centro Nacional de Prevencion de Desastres (CENAPRED)

Volcano index photo  Reventador  | Ecuador  | 0.077°S, 77.656°W  | Elevation 3562 m

IG reported that although cloud cover often prevented observations of Reventador, during 30 June and 2, 4, and 9-12 July ash emissions were seen. In the afternoon of 30 June, a diffuse ash plume was visible rising from the summit. Activity increased on 2 July when 41 explosions were recorded, as well as 27 long-period earthquakes and 15 episodes of tremor associated with emissions. A 2-km-high gas-and-ash plume was observed rising from the summit on the morning of 2 July that drifted SE and later that night an explosion was heard. The IG reported that SOTE (Sistema de Oleoducto Transecuatoriano) personnel heard explosions during the morning of 8 July. The next morning, SOTE personnel noted that the summit was clear and a gas-and-ash plume was rising from the summit up to 2 km above the crater rim. Diffuse ash plumes were also noted on 10 and 11 July that reached 1.5 km above the crater and drifted NW.

The seismic network detected the highest number of explosion signatures during 2-5 July when 34-45 events per day were detected. Up to 12 episodes of harmonic tremor per day occurred during 4 and 5 July. The highest number of long-period earthquakes occurred during 10-11 July: 90 events per day. Tremor signatures associated with emissions had a wide range during this reporting period (0-28 per day), but typically numbered less than 15 per day.

Source: Instituto Geofísico-Escuela Politécnica Nacional (IG)

Volcano index photo  Sabancaya  | Peru  | 15.787°S, 71.857°W  | Elevation 5960 m

IGP reported that during 12-27 June there were renewed signs of activity from Sabancaya. Fumarolic activity increased and gases were notably more blue and gray. Seismicity also increased, particularly long-period (LP) earthquakes (~100 LP events per day during 18, 19, and 21 June). Since 6 June, hybrid earthquakes were detected; IGP noted that this seismicity can be attributed to rising magma. During 6-10 July, a daily average of 11 hybrid earthquakes was recorded. In the past few weeks, volcano-tectonic (VT) earthquakes migrated closer to the volcano, especially when the locations were compared with those from 2013. Within a week, the concentration of VT earthquakes had moved ~10 km closer to the crater, reaching a distance ~6 km N of the crater. This activity prompted IGP to install a new seismometer to augment their monitoring capabilities, now comprising six seismometers.

From mid-June through 10 July, fumarolic activity continued and white plumes were visible, although with less intensity within the last two weeks. Seismicity increased during this time period, particularly on 30 June and 1 July when a daily average of 87 LP earthquakes was recorded. From 27 June through 6 July, there was a daily average of 44 VT earthquakes. VT earthquakes were also occurring close to the crater. There were three persistent clusters of VT earthquakes near the crater: 6 km N, 16 km NE, and 10 km E.

Source: Instituto Geofísico del Perú (IGP)

Volcano index photo  San Miguel  | El Salvador  | 13.434°N, 88.269°W  | Elevation 2130 m

According to the Ministry of Environment and Natural Resources (MARN), elevated activity was detected on 10 July from San Miguel. RSAM had increased significantly and was also high on 14 July, but decreased the next day. On 15 July MARN reported that seismicity was continuing from the N flank. SO2 flux measurements indicated a significant decrease of gas.

Sources: Servicio Nacional de Estudios Territoriales (SNET), Servicio Nacional de Estudios Territoriales (SNET)

Volcano index photo  Santa Maria  | Guatemala  | 14.757°N, 91.552°W  | Elevation 3745 m

INSIVUMEH reported that on most days during 30 June-14 July the active lava dome of Santiaguito was visibly degassing and generating plumes rising up to ~3,000 m (10,000 ft) a.s.l. that tended to drift SW. Weak explosions with some rumbling sounds occurred during this time period and ashfall was reported in the high terrain of Parcelamiento Monte Claro (S) on 2 and 14 July. Explosions were observed on 5, 7, and 10 July that ejected incandescent tephra up to 50 m above the crater rim. The active lava flow front on the E flank was also a frequent source of incandescence that generated hot avalanches into the drainages of Nimá 1 (E) and San Isidro (SW). On 2 and 10 July slope failures were reported from the scarp remaining from the 9 May 2014 eruption.

On 15 July at 1430 lahars were triggered by heavy rainfall. INSIVUMEH reported that lahars were channelized within Nimá 1, San Isidro, and the tributaries of Samala. Seismic stations detected the flow; hot volcanic material dominated the lahars as well as tree trunks and branches and blocks 1-2 m in diameter. Vapor was rising from the lahars and there was a strong sulfur odor. INSIVUMEH extended the warning for the region, including the high bridge of Castillo Armas (on the international highway NE of San Sebastián) due to the convergence of several flows upstream from that site.

Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)

Volcano index photo  Sheveluch  | Central Kamchatka (Russia)  | 56.653°N, 161.36°E  | Elevation 3283 m

KVERT reported that during 3-10 July lava-dome extrusion onto Shiveluch’s SE flank was accompanied by ash explosions, incandescence, hot avalanches, and fumarolic activity. Ash plumes rose to 7 km (23,000 ft) a.s.l. on 30 June and 11 km (36,000 ft) a.s.l. during 5-8 July. During 7-8 July, satellite images detected ash plumes extending 280 km SE of the volcano. The Aviation Color Code remained at Orange.

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)

Volcano index photo  Shishaldin  | Fox Islands (USA)  | 54.756°N, 163.97°W  | Elevation 2857 m

AVO reported that during 2-15 July low-level seismicity continued at Shishaldin volcano. Elevated surface temperatures at the summit were detected. A steam and gas plume was intermittently visible rising from the summit and drifting downwind, although satellite and web-camera images were mostly obscured due to clouds. On 9 July small explosions, probably within the summit cone, were detected on seismic and infrasound networks. The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Watch.

Source: US Geological Survey Alaska Volcano Observatory (AVO)

Volcano index photo  Sinabung  | Indonesia  | 3.17°N, 98.392°E  | Elevation 2460 m

CVGHM reported a white plume that was occasionally brown and blue reaching 100-2,000 m above Sinabung’s crater during 8-14 July. Pyroclastic flows were observed on 10 and 12 July from the W side of the crater. On 10 July, the hot flows reached a maximum of 3 km S while the flows on 12 July extended 3-4 km S. A spokesman from the national disaster management agency noted that hot ashfall occurred in several places around the Karo district, but did not merit further evacuations. CVGHM reported that SO2 emissions were measured once during 8-14 July and yielded 1,252 tonnes/day; during the elevated activity of 11-18 January 2014 values were as high as 3,796 tonnes/day. The Alert Level remained at 3 (on a scale of 1-4).

Sources: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM), GlobalPost.com

Volcano index photo  Slamet  | Central Java (Indonesia)  | 7.242°S, 109.208°E  | Elevation 3428 m

CVGHM reported that incandescence had been visible 14 times in May and there were ash eruptions reaching 150-1,500 m above Slamet’s summit that drifted NW and W. White plumes were typically visible 50-800 m above the summit in May and June. There were 14 moderate ash eruptions during 15-30 June that generated plumes 500-1,400 m above the summit and drifted N and W. Incandescence was visible three times in June. During 1-2 July, there were 17 moderate ash plumes that generated plumes 300-1,200 m above the summit that drifted N and W. Alert Level 2 was maintained and visitors and tourists were prohibited from approaching the crater within a radius of 2 km.

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

Volcano index photo  Stromboli  | Aeolian Islands (Italy)  | 38.789°N, 15.213°E  | Elevation 924 m

INGV reported that during 30 June-1 July, small landslides occurred on Stromboli's Sciara del Fuoco. A new lava flow that began on 7 July flowed from the high part of Sciara del Fuoco (N2) and followed the path of the previous flows. A hot avalanche occurred at 0733 that reached the coastline and was followed by a lava flow. Two other lava flows began from the same location (N2); one during the afternoon of 9 July that was accompanied by small landslides and another on 10 July.

Source: Sezione di Catania - Osservatorio Etneo (INGV)

Volcano index photo  Tungurahua  | Ecuador  | 1.467°S, 78.442°W  | Elevation 5023 m

IG reported that Tungurahua had low levels of seismicity and poor viewing conditions during 24-27 June and in July during 1-9 and 14. Heavy rain during the night of 24 June and morning of 25 June generated small lahars that caused damage to the Baños- Penipe highway. During the afternoon of 28 June clear viewing conditions allowed observations of a 100-m-high white plume rising from the summit crater. Otherwise, clear conditions revealed quiescence at the summit. Heavy rain during the night of 7 July and the following morning generated lahars in the drainages of Mandur to the NW: Pondoa, Cusúa, and Pingullo. A major road was destroyed in the area of Asupashal and the flow through Juive (NW) carried blocks up to 50 cm. A small lahar on 14 July was detected in the Juive drainage after heavy rainfall during the prior evening.

Source: Instituto Geofísico-Escuela Politécnica Nacional (IG)

Volcano index photo  Ubinas  | Peru  | 16.355°S, 70.903°W  | Elevation 5672 m

IGP reported that the eruption of Ubinas was continuing during 12 June-10 July. During 12-30 June six explosions generated plumes 1,400-3,600 m above the crater. Volcanic tremor was associated with ash emissions during 12-21, 25, and 26 June. During 28-29 June more than 1,000 hybrid earthquakes were recorded, but volcano-tectonic earthquakes were scarce. A moderate explosion on 30 June generated an incandescent plume. After more than 50 hours of tremor, a moderate explosion occurred at 0858 on 30 June; the plume reached 1,800 m above the crater and ejected tephra 1,500 m down the NW flank.

During 30 June-10 July IGP detected five, small-sized explosions that generated plumes 400-1,500 m above the crater. Seismicity was also reduced during this period; the greatest number of hybrid earthquakes was registered on 6 July when a swarm of 115 earthquakes occurred.

Source: Instituto Geofísico del Perú (IGP)

Volcano index photo  Zhupanovsky  | Eastern Kamchatka (Russia)  | 53.589°N, 159.15°E  | Elevation 2899 m

KVERT reported that during 2, 5, and 9 July, moderate gas-and-steam activity was observed at Zhupanovsky. An ash plume up to 6 km (19,700 ft) a.s.l. was observed on 9 July. Satellite data showed an ash plume extending up to 450 km E and SE of the volcano during 9-10 July. The Aviation Color Code was maintained at Orange.

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)

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Agung Colo Hunga Tonga-Hunga Ha'apai Lewotobi Papandayan Sotara
Ahyi Concepcion Ibu Lewotolo Parker Soufriere Hills
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Barren Island Fukutoku-Oka-no-Ba Kick 'em Jenny Montagu Island San Cristobal Tokachidake
Batur Galeras Kikai Moyorodake [Medvezhia] San Miguel Tolbachik
Bezymianny Galunggung Kilauea Mutnovsky San Vicente Toliman
Bogoslof Gamalama Kirishimayama Myojinsho Sangay Tongariro
Brava Gamkonora Kizimen Nabro Sangeang Api Tungurahua
Bristol Island Gaua Klyuchevskoy Negra, Sierra Santa Ana Turrialba
Bulusan Gorely Kolokol Group Negro, Cerro Santa Maria Ubinas
Calbuco Great Sitkin Korovin Nightingale Island Sarigan Ulawun
Callaqui Grimsvotn Koryaksky Nishinoshima Sarychev Peak Unnamed
Cameroon Guagua Pichincha Krakatau Nisyros Saunders Unnamed
Campi Flegrei del Mar di Sicilia Guallatiri Krummel-Garbuna-Welcker Novarupta Semeru Veniaminof
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Cereme Hachijojima Kurikomayama Nyamuragira Seulawah Agam West Mata
Chachadake [Tiatia] Hakoneyama Kusatsu-Shiranesan Nyiragongo Sheveluch Whakaari/White Island
Chaiten Heard Kverkfjoll Okataina Shishaldin Witori
Chiginagak Hekla Lamington Okmok Simbo Wolf
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Chiles-Cerro Negro Hokkaido-Komagatake Langila Oraefajokull Sinarka Zaozan [Zaosan]
Chillan, Nevados de Home Reef Lanin Osorno Siple Zavodovski
Chirinkotan Hood Lascar Pacaya Sirung Zhupanovsky
Chirpoi Huaynaputina Lateiki Pagan Slamet Zubair Group
Cleveland Hudson, Cerro Lengai, Ol Doinyo Paluweh Soputan
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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


The Weekly Volcanic Activity Report does not necessarily include all volcanic activity that occurred on Earth during the week. More than a dozen volcanoes globally have displayed more-or-less continuous eruptive activity for decades or longer, and such routine activity is typically not reported here. Moreover, Earth's sea-floor volcanism is seldom reported even though in theory it represents the single most prolific source of erupted material. The Weekly Volcanic Activity Report summarizes volcanic activity that meets one or more of the following criteria:

- A volcano observatory raises or lowers the alert level at the volcano.
- A volcanic ash advisory has been released by a volcanic ash advisory center (VAAC) stating that an ash cloud has been produced from the volcano.
- A verifiable news report of new activity or a change in activity at the volcano has been issued.
- Observers have reported a significant change in volcanic activity. Such activity can include, but is not restricted to, pyroclastic flows, lahars, lava flows, dome collapse, or increased unrest.

Volcanoes are included in the "New Activity/Unrest" section of the Weekly Volcanic Activity Report if the activity occurs after at least 3 months of quiescence. Once a volcano is included in the "New Activity/Unrest" section, updates will remain in that section unless the activity continues for more than 1 month without escalating, after which time updates will be listed in the "Continuing Activity" section. Volcanoes are also included in the "New Activity/Unrest" section if the volcano is undergoing a period of relatively high unrest, or increasing unrest. This is commonly equal to Alert Level Orange on a scale of Green, Yellow, Orange, Red, where Red is the highest alert. Or alert level 3 on a scale of 1-4 or 1-5.

It is important to note that volcanic activity meeting one or more of these criteria may occur during the week, but may not be included in the Weekly Volcanic Activity Report because we did not receive a report.


1. The Weekly Volcanic Activity Report is intended to provide timely information about global volcanism on a weekly basis. Consequently, the report is generated rapidly by summarizing volcanic reports from various sources, with little time for fact checking. The accuracy of the Weekly Volcanic Activity Report is dependent upon the quality of the volcanic activity reports we receive. Reports published in the Bulletin of the Global Volcanism Network are monthly, and more carefully reviewed, although all of the volcanoes discussed in the Weekly Volcanic Activity Report are not necessarily reported in the Bulletin. Because of our emphasis on rapid reporting on the web we have avoided diacritical marks. Reports are updated on the Weekly Volcanic Activity Report web page as they are received, therefore information may be included regarding events that occurred before the current report period.

2. Rapidly developing events lead to coverage that is often fragmentary. Volcanoes, their eruptions, and their plumes and associated atmospheric effects are complex phenomena that may require months to years of data analysis in order to create a comprehensive summary and interpretation of events.

3. Preliminary accounts sometimes contain exaggerations and "false alarms," and accordingly, this report may include some events ultimately found to be erroneous or misleading.

4. Many news agencies do not archive the articles they post on the Internet, and therefore the links to some sources may not be active. To obtain information about the cited articles that are no longer available on the Internet contact the source.

5. USGS Disclaimer Statement for this Website:

Information presented on this website is considered public information and may be distributed or copied. Use of appropriate byline/photo/image credit is requested. We strongly recommend that USGS data be acquired directly from a USGS server and not through other sources that may change the data in some way. While USGS makes every effort to provide accurate and complete information, various data such as names, telephone numbers, etc. may change prior to updating. USGS welcomes suggestions on how to improve our home page and correct errors. USGS provides no warranty, expressed or implied, as to the accuracy, reliability or completeness of furnished data.

Some of the documents on this server may contain live references (or pointers) to information created and maintained by other organizations. Please note that USGS does not control and cannot guarantee the relevance, timeliness, or accuracy of these outside materials.

For site security purposes and to ensure that this service remains available to all users, this government computer system employs software programs to monitor network traffic to identify unauthorized attempts to upload or change information, or otherwise cause damage. Unauthorized attempts to upload information or change information on this website are strictly prohibited and may be punishable under the Computer Fraud and Abuse Act of 1986 and the National Information Infrastructure Protection Act. Information may also be used for authorized law enforcement investigations. (Last modified September 21, 1999.)

U.S. Department of the Interior, U.S. Geological Survey, Reston, VA, USA
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)