Colombia's Mount Machin and the snow-capped volcanoes Galeras, Huila, and Ruiz have been put on yellow alert after elevated activity, reports La Patria. Authorities recorded small earthquakes in the Tomila district late last week. The most significant of these was a earthquake that measured 2.3 on the Richter scale and occurred at 5:22 pm on January 1, 2011. The earthquake was felt by residents of Cajamarca, near the Mount Machin. Read more