An increased seismic activity has been identified at the volcano on 24 December, the Servicio Geológico Colombiano (SGC) reported.
At 02:02 PM local time, earthquakes have been occurring beneath the eastern flank, approx. 5 km distance from the Arenas crater. Magma likely squeezes through deeper rock layers and generates seismic energy by cracking the crust. Volcano-tectonic quakes with a maximum magnitude M 2.5 have been located at depths between 3 and 4 km. Although the increase of earthquakes had continued at low levels, some of the events had been felt by locals in sectors of La Cabaña and the Lagunilla River canyon in the department of Tolima.
Furthermore, an elevated seismic activity has been registered in the vicinity of the lava dome in the inner summit crater. The activity intensified at 11:01 PM local time on 24 December, it continued until 07:40 AM yesterday, mainly between 04:00 AM and 05:50 AM local time.
Source: Servicio Geológico Colombiano volcano activity update 26 December 2023