At Unzen, a strato volcano in Japan, one of its flanks fell off into a small sea. This disaster caused another. There was a huge tsunami that killed 15,000 people. Rhyolite caldera complexes are what is left of extremely explosive volcanoes that collapsed on top of themselves. They are in Yellowstone, La Primavera, Rabaul, Taupo, Toba and elsewhere.
Flood basalts are much like mudflows.
Flood basalts slowly ooze down the volcanoes and can be 50 ft. thick. MORB is the most commonly found rock type on the Earth s surface. Mid-Ocean Ridges are the locations of thousands of earthquakes. The eruptions of Mid-Ocean Ridges have never been witnessed, although they can be found all over the world. Location Volcanoes can be found on every continent.