An eruption at submarine Ruby volcano, near the southern end of the Mariana arc, was detected on Thursday, September 14, 2023. This was based on seismoacoustic signals from a monitoring station in Saipan and satellite imagery that captured a submarine plume. The last known eruption at this volcano took place in 1995.
On September 15, 2023, around 01:10 UTC, an explosive eruption from Shishaldin Volcano sent an ash-rich cloud soaring to an altitude of 12.8 km (42 000 feet), accompanied by volcanic lightning. The eruption followed a several-hour increase in seismicity. The Aviation Color Code and Volcano Alert Level were raised to RED/WARNING.
New activity/unrest was reported for 1 volcano from September 6 to 12, 2023. During the same period, ongoing activity was reported for 19 volcanoes.
Vanuatu’s Yasur volcano experienced increased activity on September 12, 2023, with intense explosions and abundant ash emissions. The Alert Level remains at 2 of 4.
At 01:15 UTC on September 11, 2023 (15:15 HST, September 10), the USGS Hawaiian Volcano Observatory (HVO) identified new eruptive activity at Kīlauea’s summit within Hawai‘i Volcanoes National Park, based on webcam images and field reports. The eruption was preceded by intense seismic activity and rapid uplift at the summit.
New activity/unrest was reported for 3 volcanoes from August 30 to September 5, 2023. During the same period, ongoing activity was reported for 22 volcanoes.
New activity/unrest was reported for 2 volcanoes from August 23 to 29, 2023. During the same period, ongoing activity was reported for 16 volcanoes.
New activity/unrest was reported for 3 volcanoes from August 26 – 22, 2023. During the same period, ongoing activity was reported for 20 volcanoes.
New activity/unrest was reported for 4 volcanoes from August 9 to 15, 2023. During the same period, ongoing activity was reported for 16 volcanoes.
A new Strombolian eruption started at Etna’s Southeast Crater at 18:40 UTC on August 13, 2023. The activity increased to lava fountaining over the next couple of hours.
