Fig. 2From: Response of a hydrothermal system to escalating phreatic unrest: the case of Turrialba and Irazú in Costa Rica (2007–2012)View of the summit crater lake within the “Cráter Activo” of Irazú in April 2007 (a from the south), December 2009 (b from the north), March 2010 (c from the north), and May 2010 (d, from the north), showing a progressive reduction of the lake level. Pictures by D. Rouwet (a, b, c) and R. Mora-Amador (d)Back to article page