The Weekly Volcanic Activity Report: October 25 – 31, 2023
New activity/unrest was reported for 8 volcanoes from October 25 to 31, 2023. During the same period, ongoing activity was reported for 20 volcanoes.
Ash cloud produced by eruption at Klyuchevskoy reaches 14 km (46 000 feet) a.s.l., Russia
Significant activity was reported at Klyuchevskoy volcano in Kamchatka, Russia, on October 31, 2023. The Aviation Color Code was raised to Red at 02:34 UTC, and satellite data indicated an ash column reaching up to 14 km (46 000 feet) above sea level at 23:10 UTC.
Exceptionally intense earthquake swarm near Þorbjörn, Iceland
An exceptionally intense earthquake swarm lasting nearly two hours started at Þorbjörn in Iceland at 08:40 on October 31, 2023. The largest event registered an M3.7, and the activity signaled potential magma movement at depths between 1.5 km and 5 km (0.93 – 3.1 miles).
Mount St. Helens experiences largest seismic increase since last eruption ended in 2008, US
Elevated seismic activity has been observed at Mount St. Helens in the United States since 2008 when the last eruption ended. No significant changes have been observed in other monitoring parameters and there are no signs of an imminent eruption.
Violent paroxysms at Klyuchevskoy volcano, Aviation Color Code raised to Red, Russia
Activity at Klyuchevskoy volcano in Kamchatka, Russia increased significantly on October 31, 2023, prompting KVERT to raise the Aviation Color Code from Orange to Red. The ash column reached up to 9.8 km (32 152 feet) above sea level and extended for 365 km (226 miles) to the SSE of the volcano.
Indonesian authorities warn of increased activity at Mount Anak Krakatau
Seismic activity at Mount Anak Krakatau intensified on October 28, 2023, prompting Indonesian authorities to issue a 5 km (3.1 miles) exclusion zone around the main crater. The heightened activity included a range of earthquakes and internal vibrations indicative of potential eruptions.
Complex volcano-tectonic unrest affecting the Reykjanes Peninsula, Iceland
An episode of complex volcano-tectonic unrest is currently affecting the Reykjanes Peninsula, the Icelandic Met Office (IMO) said on October 29, 2023. It is interpreted to result from multiple deformation sources at depth, which are interacting and affecting a wide area across the peninsula.
Explosive-effusive eruption at Kamchatka’s Klyuchevskoy volcano, ash cloud reaches 10 km (33 000 feet) a.s.l.
An explosive-effusive eruption continues at the Klyuchevskoi volcano in Kamchatka, Russia, on October 29, 2023, with ash clouds reaching a height of 10 km (33 000 feet) above sea level. The Aviation Color Code remains at Orange.
Increased seismic activity and degassing at Colombia’s Puracé volcano
On October 25, 2023, Colombia’s Puracé Volcano experienced a noticeable increase in seismic activity, with earthquakes reaching a maximum magnitude of 1.0. Located between 1 and 4 km (0.6 – 2.5 miles) in depth, these quakes coincided with higher degassing levels and persistent high CO2 values.
The Weekly Volcanic Activity Report: October 18 – 24, 2023
New activity/unrest was reported for 5 from October 18 to 24, 2023. During the same period, ongoing activity was reported for 16 volcanoes.
