article: Nevado del Ruiz
links: Mount St. Helens San Diego State University Earthquake Stratovolcano Landslide BBC Nature (journal) Fox News Lava Nazca plate Mount Rainier NOAA United States Geological Survey Analysis Pacific Ring of Fire New York Times Fumarole Mudflow Eruption Colombia Pyroclastic flow Hydrothermal vent USGS Pacific Ocean Dome Dormant volcano South American plate Magma Ice cap University of Wisconsin-Madison Plinian eruption Smithsonian Institution Pleistocene Italy CNN South America Bogotá Valley Volcanic Explosivity Index