Oooo big quake in El Salvador and now volcanic eruption in Costa Rica. Hope no one was hurt. A strong phreatic eruption occurred at the crater lake of Poas volcano on October 14, 2014. The explosion ejected mud and water more than 200 m into the air. According to first news articles, nobody was hurt, but the visiting areas have been evacuated. Todays eruption was similar to the one on October 8, 2014, the strongest eruption of the year so far. Poas began the current cycle of phreatic activity in March 2006 and the same has been characterized by the sporadic occurrence of numerous small scale eruptions. From mid-2009 until the present Observatorio Vulcanologico y Sismologico de Costa Rica-Universidad Nacional (OVSICORI-UNA) observed a general increase in the occurrence of phreatic eruptions. Some had enough energy to generate columns that exceed height of 200 - 300 meters. Poas last appeared in GVPs weekly volcano report during the week of September 3 - 9, 2014: OVSICORI-UNA reported that three consecutive phreatic eruptions occurred within the crater lake of Poás on August 27, each within 2 minutes of the previous one. One explosion generated a plume up to 200 m above the surface of the lake. Based on seismic energy released, this event was similar to the eruption on June 1, one of the largest of the year which partially destroyed a gas-measuring station. OVSICORI-UNA noted that phreatic eruptions from Poás tended to occur impulsively, have short durations (within 5-10 seconds), and frequently lack precursory activity.
Posted on: Wed, 15 Oct 2014 01:51:54 +0000
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