OVSICORI-UNA reported continuing gas-and-steam emissions rose from vents Boca A and Boca B on the crater floor of Poás. Ash ceased to be detected in the emissions at some point during 16-17 April but was again present during 22-23 April.
OVSICORI-UNA reported continuing emissions and eruptive activity at Poás during 10-16 April. Vents on the nearly dry crater floor emitted plumes of gas and steam on 10 April and the number of phreatic events began to increase. Starting at around 0600 on 11 April ash was present in emissions rising from Boca C.
OVSICORI-UNA reported continuing emissions at Poás during 3-9 April. Vents on the nearly dry crater floor vigorously emitted plumes of gas and steam; ash was present in the plumes during 3-5 April and absent on the rest of the days. The plumes rose a few hundred meters above the crater rim and mainly drifted W, SW, and S and were often detected downwind in residential areas of Heredia and El Valle Central.
mer., 3 avril 2024, 18:00
OVSICORI-UNA reported increasing activity at Poás. During 22-25 March sulfur dioxide gas emissions were as high as 277 tons based on satellite data and characterized as significant. Parque Nacional Volcán Poás officials and residents to the W reported health impacts from the emissions including headaches, nausea, nose bleeding, and irritations of eyes, nose, mouth, and skin.
Read allmer., 3 avril 2024, 14:15
mar., 2 avril 2024, 15:30
mer., 13 mars 2024, 15:00
OVSICORI-UNA reported that about 900 small phreatic eruptions at Poás were recorded by the seismic network and often visually observed during 4 March to around 0800 on 8 March; no additional eruptions were recorded at least through 12 March. The small eruptive events ejected material no higher than 50 m. The water at the bottom of the crater had almost disappeared leaving a couple of muddy water puddles.
Read alljeu., 7 mars 2024, 11:00
OVSICORI-UNA reported that about 900 small phreatic eruptions at Poás were recorded by the seismic network and often visually observed during 4 March to around 0800 on 8 March; no additional eruptions were recorded at least through 12 March. The small eruptive events ejected material no higher than 50 m. The water at the bottom of the crater had almost disappeared leaving a couple of muddy water puddles.
Read allmer., 14 févr. 2024, 15:00
OVSICORI-UNA reported that small, frequent phreatic eruptions at Poás continued during 6-13 February. Data from the monitoring network indicated that 50-600 phreatic explosive events per day were occurring, but only a few events ejected material more than 100 m. At 0107 on 6 February an eruptive event generated a column that rose at least 300 m above the crater.
Read alljeu., 8 févr. 2024, 04:25
The phreatic explosion from Poas volcano on 3 February (image: OVSICORI-UNA)
The OVSICORI-UNA surveillance webcams continue to monitor minor phreatic-type explosions from the summit crater lake.
Read allmer., 7 févr. 2024, 15:00
OVSICORI-UNA reported that small, frequent phreatic eruptions at Poás continued during 30 January-6 February. Data from the monitoring network indicated that around 600 events per day were occurring, though most of the events did not eject material more than 50 m high, and only a few ejected material more than 100 m. At 0712 on 4 February a phreatic eruption produced a plume of steam, sediments, and water that rose 200 m.
Read allmer., 31 janv. 2024, 15:00
OVSICORI-UNA reported that at 0546 on 25 January a small phreatic eruption at Poás produced a steam plume that rose more than 500 m high and drifted W. The event produced the tallest plume recorded since 30 September 2019. According to the Comisión Nacional de Prevención de Riesgos y Atención de Emergencias (CNE) the event resulted in the restriction of the number of people that can be on the viewing platform to 56 at a time and visitors were required to wear hardhats.
Read alllun., 29 janv. 2024, 06:07
![The vigorous phreatic explosion from Poas volcano on 26 January (image: OVSICORI-UNA)]()
The vigorous phreatic explosion from Poas volcano on 26 January (image: OVSICORI-UNA)
The OVSICORI-UNA surveillance webcams continue to monitor phreatic-type explosions from the summit crater lake.
Read allven., 19 janv. 2024, 04:31
![The phreatic eruption from the Poas crater lake on 15 January (image: OVSICORI)]()
The phreatic eruption from the Poas crater lake on 15 January (image: OVSICORI)
The OVSICORI-UNA reported that small phreatic-type explosions continued to be observed over the past week.
Read allmer., 17 janv. 2024, 15:00
OVSICORI-UNA reported that small phreatic eruptions at Poás continued to be observed during 8-16 January. Phreatic eruptions were recorded daily, ejecting sediment no more than 200 m above the lake's surface and producing steam-and-gas plumes that rose no higher than 500 m. In a special report OVSICORI-UNA noted that both gas-and-steam emissions and seismicity began to increase during the second half of 2023.
Read allmer., 3 janv. 2024, 19:00
OVSICORI-UNA reported that small phreatic eruptions at Poás continued to be observed. Phreatic eruptions at 1922 and 1926 on 25 December and at 0235 on 26 December ejected material 50 m above the lake surface. At 1535 on 27 December a small phreatic event ejected a plume of water and sediment 100 m above the lake and produced a steam-and-gas plume that rose 500 m.
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