Map of today's active volcanoesSvartsengi (Reykjanes peninsula, SW Iceland): Only one of the two previously active craters remains active. The activity at the northern crater stopped around 22:00 local time last night. The lava continues to keep the flow active towards the east into Fagradal, though its progress is very gradual.The seismic tremor is gradually decreasing, with occasional fluctuations caused by the build-up along the crater rim. ... [read more] ... [show less] Ground deformation measurements from GPS and InSAR currently show no signs of uplift or subsidence near Svartsengi. This suggests that magma flux is currently balanced, and that the eruption is being maintained by a deeper source of magma within the crust.Shiveluch (Kamchatka): (23 Jul) Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Tokyo warned about a volcanic ash plume that rose up to estimated 14000 ft (4300 m) altitude or flight level 140 and is moving at 20 kts in E direction.The full report is as follows: POSS ERUPTION OBS AT 20250723/0420Z FL140 EXTD E OBS VA DTG:23/0440Z to 14000 ft (4300 m)Kirishima (Kyushu): (23 Jul) Volcanic Ash Advisory Center Tokyo (VAAC) issued the following report: ERUPTED AT 20250723/0715Z FL050 EXTD W OBS VA DTG:23/0710ZIbu (Halmahera, Indonesia): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Darwin warned about a volcanic ash plume that rose up to estimated 7000 ft (2100 m) altitude or flight level 070 .The full report is as follows: VA TO FL070 OBS AT 23/1200Z MOV NE OBS VA DTG:23/1200Z to 7000 ft (2100 m)Lewotolo (Lesser Sunda Islands): (23 Jul) Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Darwin warned about a volcanic ash plume that rose up to estimated 6000 ft (1800 m) altitude or flight level 060 .The full report is as follows: VA TO FL060 LAST REPORTED AT 22/1823Z OBS VA DTG:23/0750Z to 6000 ft (1800 m)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 23/1250Z MOV SE OBS VA DTG:23/1250Z to 15000 ft (4600 m)Marapi (Western Sumatra, Indonesia): (23 Jul) Volcanic Ash Advisory Center Darwin (VAAC) issued the following report: GROUND REPORT OF ERUPTION WITH VA TO FL150 MOV SERuapehu (North Island): Episodes of renewed heating beneath Ruapehu are often preceded by local earthquakes and signs of rising heat and gas. Recently, clusters of very small earthquakes were recorded by some of the volcano’s seismometers. However, their precise locations and depths could not be determined. There is no evidence linking these quakes to the earthquake swarm that occurred two weeks ago, approximately 10 km east of Ruapehu. Volcanic tremor—an important signal of fluid movement within the volcano—has shown no significant changes and remains weak.Over the past month, the temperature of Ruapehu’s Crater Lake has stabilized between approximately 10 to 12 ºC. While relatively low, this temperature suggests a continued low-level heat input. ... [read more] ... [show less] A pulse of sulfur dioxide detected last week by continuous gas monitoring indicates that the summit remains open to gas release. No other significant changes have been observed, and current activity at Ruapehu continues to reflect typical low-level unrest.Popocatépetl (Central Mexico): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Washington warned about a volcanic ash plume that rose up to estimated 19000 ft (5800 m) altitude or flight level 190 .The full report is as follows: VA EMS OBS to 19000 ft (5800 m)Santiaguito (Guatemala): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Washington warned about a volcanic ash plume that rose up to estimated 16000 ft (4900 m) altitude or flight level 160 .The full report is as follows: VA EMS OBS to 16000 ft (4900 m)Telica (Nicaragua): Volcanic Ash Advisory Center Washington (VAAC) issued the following report: VA EMS OBSSangay (Ecuador): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Washington warned about a volcanic ash plume that rose up to estimated 19000 ft (5800 m) altitude or flight level 190 and is moving at 5 kts in NE direction.The full report is as follows: VA EMS CONT to 19000 ft (5800 m)Reventador (Ecuador): Volcanic Ash Advisory Center Washington (VAAC) issued the following report: VOL ACTIVITY OBS VA LKLYVolcano Activity Summary for 23 Jul 2025:The lava flow continues to travel mostly eastward (image: IMO)