The pyroclastic flow followed vulcanian-type eruption at Reventador on 8 April (image: Benjamin Bernard)
The effusive-explosive eruption of the volcano continues and has remained essentially unchanged.
Near-constant vulcanian explosions continue to take place from the summit crater that reached 4,6 km (15,000 ft) height and drifted north and northwest over the past few days.
Multiple incandescent avalanches continue to be observed, reaching length of at least 900-1,200 meters from the summit vent.
On 8 April, an explosion generated a pumice-and-ash flow caused likely by the eruption column collapse. Pyroclastic flows are deadly, turbulent hot avalanche of lava rock fragments of all sizes embedded in a mixture of turbulent gas and ash racing down slopes
Lahars (mud flows) could also occur if heavy rainfalls remobilise the fresh ash deposits.
Source: Instituto Geofísico volcano activity update 24 April 2025
Semeru (East Java, Indonesia): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Darwin warned about a volcanic ash plume that rose up to estimated 15000 ft (4600 m) altitude or flight level 150 . The full report is as follows: VA TO FL150 OBS AT 23/1900Z MOV WSW OBS VA DTG:23/1900Z to 15000 ft (4600 m)
White Island (New Zealand): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Wellington warned about a volcanic ash plume that rose up to estimated 2000 ft (600 m) altitude or flight level 020 and is moving at 20 kts in NW direction. The full report is as follows: LOW LEVEL ERUPTION OBS VA DTG:23/1121Z to 2000 ft (600 m)
Kilauea (Hawai’i): (23 Apr) The north and south vents ceased erupting around the same time. The fountaining phase of episode 18 began at 03:20 AM yesterday and continued for 10 hours and 8 minutes. The lava erupted from both vents, with the south vent producing fountains that exceeded 600 feet (200 meters) in height, while the north vent’s fountains remained under 200 feet (60 meters). Source: Hawaiian Volcano Observatory volcano activity update 23 April 2025
Poas (Costa Rica): Volcanic Ash Advisory Center Washington (VAAC) issued the following report: VONA RPTD VA EMS
Sangay (Ecuador): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Washington warned about a volcanic ash plume that rose up to estimated 24000 ft (7300 m) altitude or flight level 240 . The full report is as follows: CONS VA EMS OBSD to 24000 ft (7300 m)
Reventador (Ecuador): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Washington warned about a volcanic ash plume that rose up to estimated 15000 ft (4600 m) altitude or flight level 150 . The full report is as follows: ONGOING VA EMS to 15000 ft (4600 m)
