Activity at a low level has continued at Galeras. Small explosions occasionally cause ash to fall on nearby villages and towns. The volcano has continued to be well-studied, and predictions of eruptions at the volcano have improved. One phenomenon, which seems to be a reliable precursor to eruptive activity, is a low-frequency seismic event known as a "tornillo event". These have occurred before about eighty percent (80%) of the explosions at Galeras, and the number of tornillo events recorded before an eruption is also correlated with the size of the eruption that followed.