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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