************************************************************************************ Poás Volcano: Widespread rockslides triggered by 6.2 earthquake. From: Eliecer Duarte <eduarte@xxxxxxxxx> ************************************************************************************ Fieldwork was carried out yesterday (Feb. 11, 2009) to assess and document impact of rockslides within and around Poás Volcano active crater. Hundreds of rockslides (all sizes) were drawn and explained in a field report, one month after the Cinchona earthquake shook the summit and surroundings. Previously unstable areas (subject to gravity) were the most affected 360 degrees around the intracrater area. Many other rockslides occurred along walls supposedly stable. Although no augmented activity is related to massive falling of material, eventually fine sediments will end up at the bottom of the hot, acidic lake. A previous unstable area, east and near the lake, fell almost completely, burying a fumarolic axis that acted as a subaerial release for some 9 years. It seems that the vigorous degassing activity returned entirely to the dome and the hot lake. Hence the lake shows heavy curtains of gas and vapor. Fumarolic activity from the dome looks stronger and sustained, compared to recent years. More details (Spanish) available in the field report, at: http://www.ovsicori.una.ac.cr/informes_prensa/2009/deslizampoas12022009.pdf ============================================================== To unsubscribe from the volcano list, send the message: signoff volcano to: listserv@xxxxxxx, or write to: volcano-request@xxxxxxxx To contribute to the volcano list, send your message to: volcano@xxxxxxxx Please do not send attachments. ==============================================================
