Increasing Volcanic Unrest Observed at Nevado del Ruiz in Colombia
Most people are familiar with Nevado del Ruiz due to the eruption in 1985 that killed over 23,000 people. That disaster was caused by a lahar (volcanic mudflow) generated by a small eruption from the summit crater melting the abundance ice and snow at the summit. The most recent pictures of the summit area show that there is plenty of snow to make lahars a very real hazard if Ruiz where to begin to enter a new period of eruption.
Read more here.