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Volcanoes Today, 1 May 2025: Semeru volcano, Dukono, Reventador



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📈 Sismo Recente:
🔺M 4.8 - 287 km N of Tobelo, Indonesia

Time2025-04-30 23:38:26 UTC2025-04-30 23:38:26 UTC at epicenterLocation4.296°N 128.416°EDepth8.18 km (5.08 mi)
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📈 Sismo Recente:
🔺M 4.9 - 292 km N of Tobelo, Indonesia

Time2025-04-30 23:56:04 UTC2025-04-30 23:56:04 UTC at epicenterLocation4.346°N 128.367°EDepth10.90 km (6.77 mi)
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Karymsky Volcano Volcanic Ash Advisory: VA EMISSIONS CONTINUING OBS VA DTG: 30/2320Z to 12000 ft (3700 m)



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📈 Sismo Recente:
🔺M 4.8 - 45 km WNW of San Antonio de los Cobres, Argentina

Time2025-05-01 00:11:20 UTC2025-05-01 00:11:20 UTC at epicenterLocation24.056°S 66.733°WDepth204.44 km (127.03 mi)
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Volcanoes Today, 1 May 2025: Karymsky volcano, Semeru, Dukono, Reventador



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Poas Volcano Volcanic Ash Advisory: PSBL VA EMS EST VA DTG: 01/0040Z



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📈 Sismo Recente:
🔺M 4.8 - 35 km ESE of Torbat-e Ḩeydarīyeh, Iran

Time2025-05-01 01:40:33 UTC2025-05-01 01:40:33 UTC at epicenterLocation35.183°N 59.596°EDepth10.00 km (6.21 mi)
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Yasur volcano (Vanuatu) - Smithsonian / USGS Weekly Volcanic Activity Report for 23 April-29 April 2025 (Continuing Activity)

On 24 April 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). Satellite and webcam images indicated that explosions continued, producing emissions of gas, steam, and/or ash. Sulfur dioxide gas emissions were identified in satellite images during 1-8, 11-12, 15, 17-19, and 21-22 April, and low-level thermal anomalies were identified during 1, 3, 5, 7, 12, 16, 18-19, and 21 April.
Seismic data confirmed continuing volcanic activity with explosions that were occasionally strong. The report warned that ejected material from explosions could fall 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) (http://www.geohazards.gov.vu/)
---
From: Global Volcanism Program, 2025. Report on Yasur (Vanuatu). In: Mayberry, G (ed.), weekly volcanic activity report 23 april-29 april 2025 (https://volcano.si.edu/showreport.cfm?doi=GVP.WVAR20250423-257100). Smithsonian Institution and US Geological Survey.

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Lewotobi volcano (Indonesia) - Smithsonian / USGS Weekly Volcanic Activity Report for 23 April-29 April 2025 (Continuing Activity)

The Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG) reported that eruptive activity at Lewotobi Laki-laki continued during 23-29 April. Gray or gray-to-black ash plumes rose 500 m above the summit, to as high as 4 km above the summit, and drifted multiple directions during 24-28 April. Though the view was often obscured due to weather or volcanic plumes, incandescence around the upper flanks was visible in a webcam image at 0215 on 25 April.
At 2115 on 27 April an eruptive event generated a dense gray as plume that rose 4 km above the summit and drifted N and NE. A corresponding webcam images showed trails of incandescent material on the upper flanks. The Alert Level remained at 3 (on a scale of 1-4) and the public was warned to stay 6 km away from the center of Laki-laki.

Source: pusat vulkanologi dan mitigasi bencana geologi (pvmbg, also known as cvghm) (http://vsi.esdm.go.id/)
---
From: Global Volcanism Program, 2025. Report on Lewotobi (Indonesia). In: Mayberry, G (ed.), weekly volcanic activity report 23 april-29 april 2025 (https://volcano.si.edu/showreport.cfm?doi=GVP.WVAR20250423-264180). Smithsonian Institution and US Geological Survey.

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Lewotolok volcano (Indonesia) - Smithsonian / USGS Weekly Volcanic Activity Report for 23 April-29 April 2025 (Continuing Activity)

The Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG) reported that an eruption at Lewotolok was ongoing during 23-29 April. White steam-and-gas plumes rose as high as 100 m above the summit of the cone and drifted E and SE. Nighttime webcam images showed incandescent material being ejected above the summit.
The Alert Level remained at 2 (on a scale of 1-4) and the public was warned to stay 2 km away from the vent and 2.5 km away on the S, SE, and W flanks.

Source: pusat vulkanologi dan mitigasi bencana geologi (pvmbg, also known as cvghm) (http://vsi.esdm.go.id/)
---
From: Global Volcanism Program, 2025. Report on Lewotolok (Indonesia). In: Mayberry, G (ed.), weekly volcanic activity report 23 april-29 april 2025 (https://volcano.si.edu/showreport.cfm?doi=GVP.WVAR20250423-264230). Smithsonian Institution and US Geological Survey.

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Semeru volcano (Indonesia) - Smithsonian / USGS Weekly Volcanic Activity Report for 23 April-29 April 2025 (Continuing Activity)

The Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG) reported that activity continued at Semeru during 23-29 April, with multiple daily eruptive events recorded by the seismic network. White-and-gray ash plumes rose 300-900 m above the summit and drifted in multiple directions. Incandescence at the summit was visible in 24 and 26 April webcam images.
The Alert Level remained at 2 (the second lowest level on a scale of 1-4). The public was warned to stay at least 5 km away from the summit in all directions, 13 km from the summit to the SE, 500 m from the banks of the Kobokan drainage as far as 17 km from the summit, and to avoid other drainages including the Bang, Kembar, and Sat, due to lahar, avalanche, and pyroclastic flow hazards.

Source: pusat vulkanologi dan mitigasi bencana geologi (pvmbg, also known as cvghm) (http://vsi.esdm.go.id/)
---
From: Global Volcanism Program, 2025. Report on Semeru (Indonesia). In: Mayberry, G (ed.), weekly volcanic activity report 23 april-29 april 2025 (https://volcano.si.edu/showreport.cfm?doi=GVP.WVAR20250423-263300). Smithsonian Institution and US Geological Survey.

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Marapi volcano (Indonesia) - Smithsonian / USGS Weekly Volcanic Activity Report for 23 April-29 April 2025 (Continuing Activity)

The Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG) reported that eruptive activity from Verbeek Crater at Marapi (on Sumatra) continued during 23-29 April. Dense gray ash plumes rose 350-1,000 m above the summit and drifted N during 25 and 27-28 April. Two more eruptive events were recorded on 28 April but not visually observed due to weather conditions.
The Alert Level remained at 2 (on a scale of 1-4) and the public was warned to stay 3 km away from the active crater.

Source: pusat vulkanologi dan mitigasi bencana geologi (pvmbg, also known as cvghm) (http://vsi.esdm.go.id/)
---
From: Global Volcanism Program, 2025. Report on Marapi (Indonesia). In: Mayberry, G (ed.), weekly volcanic activity report 23 april-29 april 2025 (https://volcano.si.edu/showreport.cfm?doi=GVP.WVAR20250423-261140). Smithsonian Institution and US Geological Survey.

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Nevado del Ruiz volcano (Colombia) - Smithsonian / USGS Weekly Volcanic Activity Report for 23 April-29 April 2025 (Continuing Activity)

The Servicio Geológico Colombiano’s (SGC) Observatorio Vulcanológico y Sismológico de Manizales reported that eruptive activity at Nevado del Ruiz continued during 22-28 April. Seismic data indicated that events associated with fluid movement increased in both number and intensity compared to the previous week. Some of the seismic events were associated with pulsating ash emissions; webcam images confirmed these ash emissions, including some with higher-temperature ejecta.
Gas-and-steam plumes rose as high as 1.8 km above the summit and drifted NNE, N, and NNW; the highest plume, a gas-and-ash emission that rose as high as 2 km above the summit, occurred at 2251 on 26 April. Seismicity associated with rock fracturing stayed at similar levels compared to the previous week. The earthquakes were mainly located below Arenas Crater and the NE, E, S, and SW flanks within 5 km at depths of 1-8 km.
Low-energy thermal anomalies on the crater floor were identified in satellite data, though weather clouds often obscured views. Sulfur dioxide emissions detected in satellite data continued to be significant. The Alert Level remained at Yellow (the second level on a four-level scale), and the public was warned to stay out of the restricted areas around Arenas Crater, not to spend long periods of time on the Murillo-Cerro Gualí Road, and to avoid drainages in the high-threat zones.

Source: servicio geológico colombiano (sgc) (https://www2.sgc.gov.co/volcanes/index.html)
---
From: Global Volcanism Program, 2025. Report on Nevado del Ruiz (Colombia). In: Mayberry, G (ed.), weekly volcanic activity report 23 april-29 april 2025 (https://volcano.si.edu/showreport.cfm?doi=GVP.WVAR20250423-351020). Smithsonian Institution and US Geological Survey.

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Sangay volcano (Ecuador) - Smithsonian / USGS Weekly Volcanic Activity Report for 23 April-29 April 2025 (Continuing Activity)

The Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN) reported high levels of eruptive activity at Sangay during 21-29 April. The seismic network recorded 124-258 daily explosions. Several ash-and-gas plumes were observed rising more than 4 km above the summit during 22-24 April, as high as 3 km above the summit during 24-25 April, and up to 1.7 km above the summit during the rest of the week; weather clouds sometimes obscured views during the last half of the week and almost completely obscured views during 21-22 and 26-27 April.
The ash-and-gas plumes drifted mainly NW, W, and SW. Minor ashfall was reported in the province of Chimborazo during 22-25 April, and especially in the parish of Cebadas and in Utucun, Rayoloma, and Pueblo Cebadeño during 23-24 April. Nighttime crater incandescence was visible.
On most nights several incandescent avalanches were observed descending the SE flank as far as 1 km below the summit. Incandescent material was ejected 100 m above the summit during 23-24 April. 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) (http://www.igepn.edu.ec/), secretaría de gestión de riesgos (sgr) (http://www.gestionderiesgos.gob.ec/)
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From: Global Volcanism Program, 2025. Report on Sangay (Ecuador). In: Mayberry, G (ed.), weekly volcanic activity report 23 april-29 april 2025 (https://volcano.si.edu/showreport.cfm?doi=GVP.WVAR20250423-352090). Smithsonian Institution and US Geological Survey.

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Lopevi volcano (Vanuatu) - Smithsonian / USGS Weekly Volcanic Activity Report for 23 April-29 April 2025 (Continuing Activity)

On 24 April the Vanuatu Meteorology and Geohazards Department (VMGD) reported that during the previous month seismic data confirmed continuing unrest at Lopevi. Small fumarolic steam plumes were continuously emitted at the summit crater based on webcam images from 1, 19, and 20 April. Low-level thermal anomalies were identified in satellite images on 6 and 20 April, indicative of increased surface temperatures.
The Alert Level remained at 2 (on a scale of 0-4).

Source: vanuatu meteorology and geohazards department (vmgd) (http://www.geohazards.gov.vu/)
---
From: Global Volcanism Program, 2025. Report on Lopevi (Vanuatu). In: Mayberry, G (ed.), weekly volcanic activity report 23 april-29 april 2025 (https://volcano.si.edu/showreport.cfm?doi=GVP.WVAR20250423-257050). Smithsonian Institution and US Geological Survey.

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Sheveluch volcano (Russia) - Smithsonian / USGS Weekly Volcanic Activity Report for 23 April-29 April 2025 (Continuing Activity)

The Kamchatkan Volcanic Eruption Response Team (KVERT) reported that lava extrusion may have continued at Sheveluch’s “300 years of RAS” dome on the SW flank of Old Sheveluch and at the Young Sheveluch dome during 17-24 April. Thermal anomalies over the domes were identified in satellite images during 20-21 April; weather clouds obscured views on the other days. The Aviation Color Code remained at Orange (the second highest 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) (http://www.kscnet.ru/ivs/kvert/index_eng.php)
---
From: Global Volcanism Program, 2025. Report on Sheveluch (Russia). In: Mayberry, G (ed.), weekly volcanic activity report 23 april-29 april 2025 (https://volcano.si.edu/showreport.cfm?doi=GVP.WVAR20250423-300270). Smithsonian Institution and US Geological Survey.

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Sangay Volcano Volcanic Ash Advisory: ONGOING VA EMS to 21000 ft (6400 m)



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Volcanoes Today, 1 May 2025: Karymsky volcano, Semeru, Dukono, Reventador, Poas, Sangay



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Nevado del Ruiz Volcano Volcanic Ash Advisory: NEW VA EMS. to 21000 ft (6400 m)



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