Scientists are arriving to the field, and evacuation efforts are being made by the local autorities, some 300 families have been relocated. 10 Kilometer beim Vulkan. Die jetzige Ausbruchspghase begann am 6. The area is remote making volcano monitoring difficult, and very few population centers are located within a distance of 10 Km from the volcano. Since its last magmatic eruption in 1966-67, this volcano has been having moderate to very vigorous fumarolic activity, with periods of increased activity in which phreatic eruptions are emitted from the active crater lake.
Eruptions consist mainly of cypresoidal jets of hot water, wet ash and water vapor.
The largest eruptions fall outside of the active crater. The muddy hot water issued by the eruption normally descends along the streams, that drain the steep area located north of the active crater, producing hot mudflows or lahars. The drainages under lahar hazard are the Penjamo and the Azul rivers. Both rivers merge to flow north under the name of Pizote river. Rincon de la Vieja volcano started a period of increased activity which had its highest peak during November 8, 1995.