Cerro Machin

Cerro Machin is a rhyolitic volcano with a Holocene record of several Plinian eruptions and extensive pyroclastic flows. In the last few years earthquake swarms beneath the main crater have suggested shallow magma intrusion. Tens of thousands of people would be directly threatened by a major eruption, hundreds of thousands would likely be affected by lahars and ash fall and a major transport route from Bogota to the Pacific coast that goes though this area could be cut off.