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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 14 July-20 July 2021
NameLocationEruption Start DateReport Status
SuwanosejimaRyukyu Islands (Japan)2004 Oct 23New
TaalLuzon (Philippines)New
DukonoHalmahera (Indonesia)1933 Aug 13Continuing
EbekoParamushir Island (Russia)2016 Oct 20Continuing
FuegoGuatemala2002 Jan 4Continuing
KarymskyEastern Kamchatka (Russia)2021 Apr 3Continuing
Krysuvik-TrolladyngjaIceland2021 Mar 19Continuing
LewotolokLembata Island (Indonesia)2020 Nov 27Continuing
MerapiCentral Java (Indonesia)2020 Dec 31Continuing
Nevado del RuizColombia2014 Nov 18Continuing
SangayEcuador2019 Mar 26Continuing
Santa MariaGuatemala1922 Jun 22Continuing
SemisopochnoiAleutian Islands (USA)Continuing
SheveluchCentral Kamchatka (Russia)1999 Aug 15Continuing
SinabungIndonesia2020 Aug 8Continuing
Whakaari/White IslandNorth Island (New Zealand)Continuing
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Suwanosejima | 14 July-20 July 2021 | New Activity / Unrest
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Suwanosejima
Ryukyu Islands (Japan)
JMA reported that five explosions at Suwanosejima's Ontake Crater during 12-19 July ejected bombs as far as 400 m from the crater. Crater incandescence was visible on some nights and ashfall was occasionally reported in Toshima village (4 km SSW). An explosion at 2330 on 12 July produced an ash plume that rose 3.6 km. The Alert Level remained at 3 and the public was warned to stay 2 km away from the crater.
Source: Japan Meteorological Agency (JMA)

Taal | 14 July-20 July 2021 | New Activity / Unrest
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Taal
Luzon (Philippines)
PHIVOLCS reported that unrest at Taal continued during 13-20 July. Daily plumes of steam and sulfur dioxide gas rose 0.9-2.1 km from the lake and drifted in multiple directions. Sulfur dioxide emissions averaged 1,142-6,574 tonnes/day. Two tremor events, at 1018 and 1038 on 20 July, were felt at Intensity I by residents of Pira-piraso in the NE sector of Volcano Island. The DROMIC report stated that 3,839 people were in evacuation centers or private residences by 20 July. The Alert Level remained at 3 (on a scale of 0-5) and PHIVOLCS reminded the public that the entire Taal Volcano Island is a Permanent Danger Zone (PDZ) and to not enter the high-risk barangays of Agoncillo and Laurel. Activities on Taal Lake were strictly prohibited.
Sources: Philippine Institute of Volcanology and Seismology (PHIVOLCS), Disaster Response Operations Monitoring and Information Center (DROMIC)

Dukono | 14 July-20 July 2021 | Continuing Activity
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Dukono
Halmahera (Indonesia)
Based on satellite and wind model data, the Darwin VAAC reported that during 13-19 July ash plumes from Dukono rose to 2.1-2.4 km (7,000-8,000 ft) a.s.l. and drifted NW, N, NE, and ESE. The Alert Level remained at 2 (on a scale of 1-4), and the public was warned to remain outside of the 2-km exclusion zone.
Sources: Darwin Volcanic Ash Advisory Centre (VAAC), Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)

Ebeko | 14 July-20 July 2021 | Continuing Activity
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Ebeko
Paramushir Island (Russia)
According to volcanologists in Severo-Kurilsk (Paramushir Island), about 7 km E of Ebeko, explosions during 10-14 July produced ash plumes that rose as high as 3 km (10,000 ft) a.s.l. and drifted E. A thermal anomaly was identified in satellite images on 10 and 12 July. The Aviation Color Code remained at Orange (the second highest level on a four-color scale).
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)

Fuego | 14 July-20 July 2021 | Continuing Activity
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Fuego
Guatemala
INSIVUMEH reported that 5-15 explosions per hour were recorded during 13-20 July at Fuego, generating ash plumes as high as 1.1 km above the crater rim and shock waves that often rattled buildings around the volcano. Ash plumes mostly drifted 10-20 km NW, W, and SW and caused daily ashfall in several areas downwind, including Morelia (9 km SW), Panimaché I and II (8 km SW), Santa Sofía (12 km SW), El Porvenir (8 km ENE), Finca Palo Verde, Sangre de Cristo (8 km WSW), and San Pedro Yepocapa (8 km NW). Block avalanches descended the Ceniza (SSW), Seca (W), Trinidad (S), Taniluyá (SW), Las Lajas (SE), and Honda drainages, often reaching vegetated areas. Explosions ejected incandescent material 100-400 m above the summit during 13-19 July.
Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)

Karymsky | 14 July-20 July 2021 | Continuing Activity
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Karymsky
Eastern Kamchatka (Russia)
KVERT reported that ash plumes from Karymsky were identified in satellite data drifting 80 km NW, NE, and ESE during 8-11 and 15 July. A thermal anomaly was visible during 8 and 10-13 July. The Aviation Color Code remained at Orange (the second highest level on a four-color scale).
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)

Krysuvik-Trolladyngja | 14 July-20 July 2021 | Continuing Activity
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Krysuvik-Trolladyngja
Iceland
The fissure eruption in the W part of the Krýsuvík-Trölladyngja volcanic system, close to Fagradalsfjall on the Reykjanes Peninsula, continued during 14-20 July. Lava fountaining and overflows from the fifth vent were sometimes visible, and lava from the crater flowed in tubes as well as on the surface. Visible activity at the vent occasionally paused for various lengths of time. The Aviation Color Code remained at Orange due to the lack of ash and tephra emissions, though IMO warned of the potential for lapilli and scoria fallout within a 650 m radius of the active vent. Authorities warned of increased gas emissions hazards.
Sources: Icelandic Meteorological Office (IMO), Icelandic National Broadcasting Service (RUV)

Lewotolok | 14 July-20 July 2021 | Continuing Activity
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Lewotolok
Lembata Island (Indonesia)
PVMBG reported that daily white-and-gray plumes from Lewotolok rose as high as 1 km and drifted W, NW, NE, and E during 13-20 July. Rumbling was heard daily. Incandescent material was ejected as far as 1 km from the summit vent in various directions during 16-18 July. The Alert Level remained at 3 (on a scale of 1-4) and the public was warned to stay 3 km away from the summit crater.
Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)

Merapi | 14 July-20 July 2021 | Continuing Activity
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Merapi
Central Java (Indonesia)
BPPTKG reported that the lava dome just below Merapi’s SW rim and the lava dome in the summit crater both remained active during 9-15 July. The SW rim lava-dome volume was an estimated 1.83 million cubic meters and continued to shed material down the flank. One pyroclastic flow traveled 1.1 km down the SW flank and as far as 1.5 km SE. Avalanches traveled a maximum of 1.5 km SE (58 times), 2 km SW (98 times), 1 km W (one time), and 700 m NW (three times). The volume of the summit lava dome was 2.796 million cubic meters. The Alert Level remained at 3 (on a scale of 1-4), and the public was warned to stay 5 km away from the summit.
Source: Balai Penyelidikan dan Pengembangan Teknologi Kebencanaan Geologi (BPPTKG)

Nevado del Ruiz | 14 July-20 July 2021 | Continuing Activity
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Nevado del Ruiz
Colombia
On 21 July Servicio Geológico Colombiano’s (SGC) Observatorio Vulcanológico y Sismológico de Manizales reported that seismicity at Nevado del Ruiz was generally characterized by higher number of earthquakes that had larger magnitudes than the previous week. Gas-and-steam emissions were sometimes visible in webcam images rising as high as 1.1 km above the summit and drifting WNW and WSW; these emissions sometimes contained ash. Episodes of drumbeat seismicity were recorded during 13-14 and 17 July, indicating ascent or growth of a lava dome in Arenas Crater. The Alert Level remained at 3 (Yellow; the second lowest level on a four-color scale).
Source: Servicio Geológico Colombiano (SGC)

Sangay | 14 July-20 July 2021 | Continuing Activity
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Sangay
Ecuador
IG reported a high level of activity at Sangay during 13-20 July. Weather clouds and rain sometimes prevented visual and webcam observations of the volcano. Daily ash plumes were identified in satellite images by the Washington VAAC, rising between 900 m to as high as 5.4 km above the volcano and drifting W, SW, SE, and NE. Ashfall was reported in Barca and Guamote (40 km WNW) on 14 July and in Guamote on 19 July. Signals indicating lahars were recorded by the seismic network during 15-16 and 18-20 July.
Source: Instituto Geofísico-Escuela Politécnica Nacional (IG)

Santa Maria | 14 July-20 July 2021 | Continuing Activity
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Santa Maria
Guatemala
INSIVUMEH reported that during 13-20 July daily explosions at Santa María’s Santiaguito lava-dome complex generated ash plumes that rose as high as 1 km above the summit and drifted as far as 12 km SW and W. Collapses of blocky lava from Caliente dome sent avalanches down the SW and W flanks, often reaching the base, and caused minor ashfall mostly on the volcano’s flank. Ashfall was also reported in San Marcos (8 km SW) and Loma Linda Palajunoj (6 km WSW) during 14-15 and 19-20 July. On 15 July blocks of extruded lava formed a lava flow on the W flank that was 700 m long. Block-and-ash flows descended the W and NE flanks.
Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)

Semisopochnoi | 14 July-20 July 2021 | Continuing Activity
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Semisopochnoi
Aleutian Islands (USA)
AVO reported that unrest continued at Semisopochnoi during 13-20 July. Periods of low-level tremor and steam plumes from Mount Cerberus were occasionally recorded. Elevated surface temperatures at the N cone of Mount Cerberus were identified in satellite images during 13-14 July and robust steam-and-gas emissions were seen in webcam images. A plume with low amounts of sulfur dioxide drifting about 200 km N was identified in satellite data on 17 July. Sulfur dioxide emissions were also detected the next day. The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Watch.
Source: US Geological Survey Alaska Volcano Observatory (AVO)

Sheveluch | 14 July-20 July 2021 | Continuing Activity
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Sheveluch
Central Kamchatka (Russia)
KVERT reported that a thermal anomaly over Sheveluch was identified in satellite images during 9-16 July. The Aviation Color Code remained at Orange (the second highest level on a four-color scale).
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)

Sinabung | 14 July-20 July 2021 | Continuing Activity
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Sinabung
Indonesia
Video taken on 13 July and posted on social media showed new vents on the upper W flank of Sinabung that were producing steam-and-ash emissions. PVMBG reported that white-and-gray plumes rose 100-300 m from the summit and drifted E and SE. During 14-18 June white plumes rose as high as 300 m. An eruptive event that began around 1850 on 19 July and lasted about 11 minutes produced an ash plume that rose 1 km and drifted ESE. The Alert Level remained at 2 (on a scale of 1-4), and the public was warned to remain outside of the 2-km exclusion zone.
Sources: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM), Firdaus Surbakti

Whakaari/White Island | 14 July-20 July 2021 | Continuing Activity
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Whakaari/White Island
North Island (New Zealand)
GeoNet reported continuing unrest at Whakaari/White Island. During overflights of the island on 15 and 20 July scientists observed minor steam-and-gas activity around the 2019 Primary Crater lava domes and noted that the Main Crater area continues to fill with water. Other fumarolic vents remained active and unchanged. Overall, seismicity was at low levels during the previous few months, punctuated by a few notable events; a short-lived tremor episode was recorded on 2 June, discrete acoustic signals recorded during 18-20 June were associated with geysering in a new vent N of 2019 Crater, and a 15-minute low-frequency volcanic earthquake occurred on 30 June. Nighttime incandescence has persisted in webcam views since the 30 June earthquake. Thermal infrared measurements taken on 15 July confirmed that temperatures at dome vents had notably increased, from around 110 degrees Celsius measured in late May-early June to 498-654 degrees. Gas emissions had not notably changed over the previous few months as confirmed during the 20 July overflight. The Volcanic Alert Level remained at 1 and the Aviation Color Code remained at Green.
Source: GeoNet
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