Latest (Aug-Nov 2025) | Jun-Jul 2025 | May 2025
Poás Volcano (Costa Rica) activity update Nov 21, 2025 - Continuing eruption
Saturday, Nov 22, 2025 | 2 days ago · VN
The Observatorio Vulcanológico y Sismológico de Costa Rica - Universidad Nacional (OVSICORI-UNA) reported that the eruption continued at Poás on 21 November 2025 (local). The alert level remained at "Level 2 - Warning" (on a 0–4 level scale). The aviation alert level remained at "Yellow" (level 2 on…Open article
Poás Volcano (Costa Rica) activity update Nov 18, 2025 - Continuing eruption
Wednesday, Nov 19, 2025 | 5 days ago · VN
The Observatorio Vulcanológico y Sismológico de Costa Rica - Universidad Nacional (OVSICORI-UNA) reported that the eruption continued at Poás on 18 November 2025 (local). The alert level remained at "Level 2 - Warning" (on a 0–4 level scale). The aviation alert level remained at "Yellow" (level 2 on…Open article
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Poás Volcano (Costa Rica) activity update Nov 17, 2025 - Continuing eruption
Tuesday, Nov 18, 2025 | 6 days ago · VN
The Observatorio Vulcanológico y Sismológico de Costa Rica - Universidad Nacional (OVSICORI-UNA) reported that the eruption continued at Poás on 17 November 2025 (local). The alert level remained at "…Open article
Poás Volcano (Costa Rica) activity update Sep 30, 2025 - Continuing eruption
Wednesday, Oct 1, 2025 | 1 month ago · VN
The Observatorio Vulcanológico y Sismológico de Costa Rica - Universidad Nacional (OVSICORI-UNA) reported that the eruption continued at Poás on 30 September 2025 (local). The alert level remained at "Level 2 - Warning" (on a 0â4 level scale). The aviation alert level remained at "Yellow" (leve…Open article
Poás Volcano (Costa Rica) activity update Sep 29, 2025 - Continuing eruption
Tuesday, Sep 30, 2025 | 1 month ago · VN
The Observatorio Vulcanológico y Sismológico de Costa Rica - Universidad Nacional (OVSICORI-UNA) reported that the eruption continued at Poás on 29 September 2025 (local). The alert level remained at "Level 2 - Warning" (on a 0â4 level scale). The aviation alert level remained at "Yellow" (leve…Open article
Poás Volcano (Costa Rica) activity update Sep 26, 2025 - Continuing eruption
Saturday, Sep 27, 2025 | 1 month ago · VN
The Observatorio Vulcanológico y Sismológico de Costa Rica - Universidad Nacional (OVSICORI-UNA) reported that the eruption continued at Poás on 26 September 2025 (local). The alert level remained at "Level 2 - Warning" (on a 0â4 level scale). The aviation alert level remained at "Yellow" (leve…Open article
Poás Volcano (Costa Rica) activity update Sep 24, 2025 - Continuing eruption
Thursday, Sep 25, 2025 | 1 month ago · VN
The Observatorio Vulcanológico y Sismológico de Costa Rica - Universidad Nacional (OVSICORI-UNA) reported that the eruption continued at Poás on 24 September 2025 (local). The alert level remained at "Level 2 - Warning" (on a 0â4 level scale). The aviation alert level remained at "Yellow" (leve…Open article
Poás Volcano (Costa Rica) activity update Sep 23, 2025 - Continuing eruption
Wednesday, Sep 24, 2025 | 2 months ago · VN
The Observatorio Vulcanológico y Sismológico de Costa Rica - Universidad Nacional (OVSICORI-UNA) reported that the eruption continued at Poás on 23 September 2025 (local). The alert level remained at "Level 2 - Warning" (on a 0â4 level scale). The aviation alert level remained at "Yellow" (leve…Open article
Poás Volcano (Costa Rica) activity update Sep 18, 2025 - Continuing eruption
Friday, Sep 19, 2025 | 2 months ago · VN
The Observatorio Vulcanológico y Sismológico de Costa Rica - Universidad Nacional (OVSICORI-UNA) reported that the eruption continued at Poás between 17 September 2025 (local) and 18 September 2025 (local). Ash, gas, and vapor plume(s) were reported. The alert level remained at "Level 2 - Warning…Open article
Poás Volcano (Costa Rica) activity update Sep 17, 2025 - Continuing eruption
Thursday, Sep 18, 2025 | 2 months ago · VN
The Observatorio Vulcanológico y Sismológico de Costa Rica - Universidad Nacional (OVSICORI-UNA) reported that the eruption continued at Poás on 17 September 2025 (local). The alert level remained at "Level 2 - Warning" (on a 0â4 level scale). The aviation alert level remained at "Yellow" (leve…Open article
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Poás Volcano (Costa Rica) activity update Sep 16, 2025 - Continuing eruption
Wednesday, Sep 17, 2025 | 2 months ago · VN
The Observatorio Vulcanológico y Sismológico de Costa Rica - Universidad Nacional (OVSICORI-UNA) reported that the eruption continued at Poás between 13 September 2025 (local) and 16 September 2025 (local). Gas and vapor plume(s) were reported. The alert level remained at "Level 2 - Warning" (on …Open article
Poás Volcano (Costa Rica) activity update Sep 10, 2025 - Continuing eruption
Thursday, Sep 11, 2025 | 2 months ago · VN
The Observatorio Vulcanológico y Sismológico de Costa Rica - Universidad Nacional (OVSICORI-UNA) reported that the eruption continued at Poás between 9 September 2025 (local) and 10 September 2025 (local). The alert level remained at "Level 2 - Warning" (on a 0â4 level scale). The aviation aler…Open article
Poás Volcano (Costa Rica) activity update Sep 9, 2025 - Continuing eruption
Wednesday, Sep 10, 2025 | 2 months ago · VN
The Observatorio Vulcanológico y Sismológico de Costa Rica - Universidad Nacional (OVSICORI-UNA) reported that the eruption continued at Poás between 8 September 2025 (local) and 9 September 2025 (local). The alert level at Poás remained at "Level 2 - Warning" (on a 0–4 level scale). The aviation al…Open article
Poas volcano (Costa Rica) - Smithsonian / USGS Weekly Volcanic Activity Report for 3 September-9 September 2025 (Continuing Activity)
Wednesday, Sep 10, 2025 | 2 months ago · VN
The Observatorio Vulcanológico y Sismológico de Costa Rica-Universidad Nacional (OVSICORI-UNA) reported continuing gas-and-steam emissions with occasional minor amounts of ash at Poás during 2-9 September. Weather conditions often obscured visual observations of the crater area. Gas emissions at Boc…The Observatorio Vulcanológico y Sismológico de Costa Rica-Universidad Nacional (OVSICORI-UNA) reported continuing gas-and-steam emissions with occasional minor amounts of ash at Poás during 2-9 September. Weather conditions often obscured visual observations of the crater area. Gas emissions at Boca A continued to be hot, approaching 800 degrees Celsius.
Variable incandescence at Boca A vent continued to be visible at night. The lake over Boca C continued to rise and was approaching the rim of Boca A. Small eruptive events were recorded at 1325 and 1332 on 3 September based on a slight increase in in the intensity of corresponding acoustic tremor; the events were not detected by the seismic …Open article
Variable incandescence at Boca A vent continued to be visible at night. The lake over Boca C continued to rise and was approaching the rim of Boca A. Small eruptive events were recorded at 1325 and 1332 on 3 September based on a slight increase in in the intensity of corresponding acoustic tremor; the events were not detected by the seismic …Open article
Poás Volcano (Costa Rica) activity update Sep 8, 2025 - Continuing eruption
Tuesday, Sep 9, 2025 | 2 months ago · VN
The Observatorio Vulcanológico y Sismológico de Costa Rica - Universidad Nacional (OVSICORI-UNA) reported that the eruption continued at Poás between 4 September 2025 (local) and 8 September 2025 (local). The alert level at Poás remained at "Level 2 - Warning" (on a 0–4 level scale). The aviation al…Open article
Poás Volcano (Costa Rica) activity update Sep 4, 2025 - Continuing eruption
Friday, Sep 5, 2025 | 2 months ago · VN
The Observatorio Vulcanológico y Sismológico de Costa Rica - Universidad Nacional (OVSICORI-UNA) reported that the eruption continued at Poás on 4 September 2025 (local). The alert level at Poás remained at "Level 2 - Warning" (on a 0–4 level scale). The aviation alert level remained at "Yellow" (le…Open article
Poás Volcano (Costa Rica) activity update Sep 3, 2025 - Continuing eruption
Thursday, Sep 4, 2025 | 2 months ago · VN
The Observatorio Vulcanológico y Sismológico de Costa Rica - Universidad Nacional (OVSICORI-UNA) reported that the eruption continued at Poás between 2 September 2025 (local) and 3 September 2025 (local). The alert level at Poás remained at "Level 2 - Warning" (on a 0–4 level scale). The aviation al…Open article
Poas volcano (Costa Rica) - Smithsonian / USGS Weekly Volcanic Activity Report for 27 August-2 September 2025 (Continuing Activity)
Wednesday, Sep 3, 2025 | 2 months ago · VN
The Observatorio Vulcanológico y Sismológico de Costa Rica-Universidad Nacional (OVSICORI-UNA) reported continuing gas-and-steam emissions with occasional minor amounts of ash at Poás during 27 August-2 September. Variable incandescence at Boca A vent continued to be visible at night. At 1230 on 2 S…The Observatorio Vulcanológico y Sismológico de Costa Rica-Universidad Nacional (OVSICORI-UNA) reported continuing gas-and-steam emissions with occasional minor amounts of ash at Poás during 27 August-2 September. Variable incandescence at Boca A vent continued to be visible at night. At 1230 on 2 September a gray steam-and-gas plume with a moderate amount of ash rose 500 m above the crater rim and drifted W.
A few hours later, at 1703, a light-gray steam-and-gas plume with minor ash content rose 300 m above the crater rim. The Volcanic Alert Level remained at 2 (the second lowest level on a four-level scale).
Source: Observatorio Vulcanologico y Sismologico de Costa Rica-Universidad Nacional …Open article
A few hours later, at 1703, a light-gray steam-and-gas plume with minor ash content rose 300 m above the crater rim. The Volcanic Alert Level remained at 2 (the second lowest level on a four-level scale).
Source: Observatorio Vulcanologico y Sismologico de Costa Rica-Universidad Nacional …Open article
Poás Volcano (Costa Rica) activity update Sep 2, 2025 - Continuing eruption
Wednesday, Sep 3, 2025 | 2 months ago · VN
The Observatorio Vulcanológico y Sismológico de Costa Rica - Universidad Nacional (OVSICORI-UNA) reported that the eruption continued at Poás between 1 September 2025 (local) and 2 September 2025 (local). The alert level at Poás remained at "Level 2 - Warning" (on a 0–4 level scale). The aviation al…Open article
Poas Volcano Volcanic Ash Advisory: NEW VA EMS
Wednesday, Sep 3, 2025 | 2 months ago · VN
Volcanic Ash Advisory Center Washington (VAAC) issued the following report:
FVXX21 at 02:05 UTC, 03/09/25 from KNES
VA ADVISORY
DTG: 20250903/0203Z
VAAC: WASHINGTON
VOLCANO: POAS 345040
PSN: N1011 W08413
ARE…Open article
FVXX21 at 02:05 UTC, 03/09/25 from KNES
VA ADVISORY
DTG: 20250903/0203Z
VAAC: WASHINGTON
VOLCANO: POAS 345040
PSN: N1011 W08413
ARE…Open article
