The Weekly Volcanic Activity Report: July 19 – 25, 2023
New activity/unrest was reported for 11 volcanoes. During the same period, ongoing activity was reported for 15 volcanoes.
Eruptions at Dempo volcano, Sumatra, Indonesia
Indonesian Dempo volcano started erupting at 14:15 UTC on July 25, 2023. This is the first eruption at the volcano since the preheatic explosion on June 1, 2022. The volcano has a history of VEI 1 and 2 eruptions since 1817.
Magma intrusion at Trident volcano, site of the world’s largest eruption of 20th century, Alaska
Alaska’s Trident volcano has seen a significant increase in seismic activity and ground uplift over the past five months, leading to concerns about a potential volcanic eruption. The Alaska Volcano Observatory (AVO) has confirmed that this unrest is the result of magma intrusion beneath the volcano. The rising magma, which can trigger an eruption, has also caused increased seismic activity in the neighboring volcanoes of the Katmai volcanic cluster, including Katmai, Martin, Mageik, and the Novarupta vent.
Major eruption at Shishaldin volcano, ash to 12 km (40 000 feet) a.s.l., Alaska
A major eruption is ongoing at Shishaldin volcano in Alaska, with satellite imagery suggesting the top of the ash cloud was approaching 12 km (40 000 feet) above sea level just before 08:00 UTC on July 23, 2023. As a result, the Aviation Color Code was again raised to Red.
Vulcanian explosions at Anak Krakatau, Indonesia
After weeks of phreatic activity, Vulcanian type of explosions started at the Anak Krakatau volcano in Indonesia on July 20, 2023.
Volcanic ash from Mount Bagana eruption contaminates water and crops in Papua New Guinea
The eruption of Mount Bagana volcano, located on the island of Bougainville, Papua New Guinea, has resulted in significant ash emissions, lava flow, and the displacement of over 8 000 people since July 7, 2023.
Large ash emissions at Shishaldin volcano, Aviation Color Code raised to Red, Alaska
Volcanic activity at Shishaldin volcano in Alaska, U.S. further increased on July 18, 2023, with increased lava flow and large ash emission. As a result, the Aviation Color Code was raised to Red.
Eruption at Shishaldin intensifies, Aviation Color Code raised to Red, Alaska
The eruption of Shishaldin Volcano has intensified, the Alaska Volcano Observatory (AVO) announced at 05:52 UTC on July 16, 2023, and raised the Aviation Color Code to Orange. At 07:57 UTC, the Aviation Color Code was raised to Red and the Volcano Alert Level to WARNING.
High-level eruption at Bagana volcano, ash plume to 16.4 km (54 000 feet) a.s.l., P.N.G.
Another explosive eruption took place at Bagana volcano, Papua New Guinea at around 21:30 UTC on July 14, 2023, sending a discrete plume of ash and gas to 16.4 km (54 000 feet) above sea level. The Aviation Color Code remains at Orange.
Significant explosion at Shishaldin volcano, Alaska
A significant explosion occurred at Shishaldin Volcano in Alaska, U.S. at 09:09 UTC on July 14, 2023. The Aviation Color Code remains at Orange.
