The accumulation of material on the north wall, where the river begins Pénjamo, with the consequent possibility of a flow of sediment along the bed of the river, is the main risk identified in the Rincon de la Vieja volcano. So detailed volcanologists Research Center in Geological Sciences at the University of Costa Rica (UCR), in a report submitted to the National Emergency Commission (CNE).
Specialists detailed in the document that the lake’s temperature rose to 17 ° C (increased from 28 ° C to 45 ° C), the water level of the lake dropped by two meters (both changes occurred during the last month) and solid material was located 100 meters away from the crater. These findings were made by Gino Gonzalez Segura Ilama and Yemerith Alpizar, the report also delivered to the Guanacaste Conservation Area, which is responsible for overseeing the National Park Rincon de la Vieja.This volcano is located between the cantons of Liberia, Bagaces and Upala. The Pénjamo river, by which in the past have fallen lahars (sediment flows), passing through Buenos Aires, Aguas Claras Armenia and Upala, where they can live about 4,000 people.
Eruptions. Gino Gonzalez, one of volcanologists who made the inspection, said that during the stay of two hours in the crater, observed 10 phreatic eruptions, reaching between 10 and 20 meters high. The specialist added that no such eruptions of magma supply, because what was observed gas, mud, stones and hot water. »We found sulfur blocks. It means that under the lake are forming sulfur seals, being transferred by hot fluids, increase the pressure and burst, generating eruptions, which eject these blocks. We found about 100 meters from the crater. That means that the eruptions were up to 300 meters, « he said.Mora Raul Amador, the National Seismological Network (RSN), said that the Rincon de la Vieja shows fluctuations in activity since September 2011. « It seems that is at a peak high activity, » he said.
November 08, 2015. Rincón de la Vieja , Costa Rica :
Source : nacion.com