Disasters & Survival - 83 free documentaries about earthquakes, volcanoes & tsunamis.
Start with 2004: Terror in Thailand (44 min, National Geographic), then Tsunami: Race Against Time (44 min, National Geographic). All 83 documentaries here are free to watch from their makers' official uploads. To read deeper, the top-rated book on earthquakes, volcanoes & tsunamis is Krakatoa by Simon Winchester.