Pacaya - Two lava flows of approximately 250 m. - photo Erikson Morales, Unidad de Prevención en Volcanes –UPV / via Conred
In Guatemala, the Pacaya volcano is in typical Strombolian activity, with incandescent ejections 25 meters high above the Mackenney crater. They feed two lava flows of approximately 250 meters.
The area is clear, with a temperate environment and little wind; the explosions are not audible.
In Nevado del Ruiz, ash and gas emissions were recorded on March 23 at 6:30 a.m., observed by web cameras installed in the volcano area and in Manizales.
The Colombian Geological Survey reports that earthquakes of low energy levels associated with low ash emissions have continued in recent days.
The direction of dispersion of the last emissions was governed by the direction of the wind, mainly to the northeast and southeast of the volcano, and a possible ash fall is expected in the area.
New earthquakes associated with gas and ash emissions are also not excluded.
The activity level continues in yellow or (III) / changes in the behavior of volcanic activity.
The Merapi volcano, on Java, on alert level 2 / waspada, presents on March 23 a moderate to high white plume, with a height of 100-150 meters above the summit, drifting over a large eastern sector.
At the seismicity level, the PVMBG reports:
- 4 earthquakes linked to avalanches, with an amplitude of 2 to 10 mm and an earthquake duration of 13.5 to 43.16 seconds. The sliding distance and the direction of fall are not observed.
- 1 blast earthquake, with an amplitude of 4 mm and an earthquake duration of 15.7 seconds.
- 1 low frequency earthquake with an amplitude of 3 mm and an earthquake duration of 18 seconds.
- 16 hybrid earthquakes, with an amplitude of 2 to 10 mm, S-P 0.3 to 1.3 seconds and an earthquake duration of 5.6 to 10.4 seconds. (the increase in the number of hybrid earthquakes often announces a more important next activity)
- 1 distant tectonic earthquake with an amplitude of 6 mm, S-P 38.4 seconds and 99.4 seconds of duration of the earthquake.