Unformatted text preview: What was worrisome about the spatial pattern of earthquakes below Mt. Pinatubo? • Because it only erupted a few times the explosions that usually follow are huge explosions • Location of volcano was spread apart by kilometers (5), a big footprint. • Wide distribution of earthquakes determinted a lot of magma under Mt. Pinatubo What is a lahar, and why are lahar a potential hazard after a large eruption of pyroclastic ejecta? • Hot mud flow that is added by rainfall • On composite volcanoes that erupted recently there is an abundant supply of unconsolidated sediments on steep slopes If a volcano is showing signs of imminent eruption, why is a sudden decrease in gaseous emissions worrisome? • System no degassing, an explosion may occur soon • When pressure builds up, gasses are trapped and when it gets too much it explodes...
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- Fall '11
- Geology, Volcano, pyroclastic flow deposits, Hot mud flow, volcano showing