Costa Rica. Unrest at Turrialba Volcano, Costa Rica. Turrialba Volcano, located in central Costa Rica, emits a translucent plume of volcanic gases in this natural-color satellite image from January 21, 2010. According to the RED Sismológica Nacional (Costa Rican National Seismological Network), activity at the volcano increased markedly on January 4, 2010. Strong, long-lasting volcanic tremors were accompanied by gas plumes over the volcano, and emissions of ash began on January 5th. The “jet-type noise” of gas and ash rushing out of fumaroles was heard several kilometers away. On January 21, Nacion.com reported that potato and carrot farmers were asked to leave fields near the volcano’s summit due to further increases in gas emissions. [NASA]