No deformation was detected at Turrialba between 1982 and 1996, after which there was a cumulative inflation of 2.3 μrad from October 1996 to January 1999 (Martini et al., 2010). Between 2001 and 2002 the flank EDM network detected 5 cm extension from the summit to a station 2.9 km distant (Martini et al., 2010). The flank EDM network recorded shortening from 2006-2007, followed by extension in 2008. In comparison, the summit EDM network recorded extension from 2006-mid 2007, followed by shortening from late 2007-2008, suggesting inflation of the volcano followed by deflation (Martini et al., 2010). Due to the proximity of the network to the summit, the authors were unable to constrain the source of the deformation.
No deformation was observed at Volcán Turrialba, due to low coherence in an ALOS survey of Central American volcanoes (Ebmeier et al., 2013).