EOSC 114 Lecture Notes - Lecture 12: Lateral Eruption, Debris Flow, Landslide
3 Feb 2018
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Hazard: any event or situation that could cause human or economic harm. Risk: probability that any given hazardous event might occur. Violently as pyroclastic material: lava flows. Easy to predict flow path (usually) mafic + low viscosity. La(cid:448)a flo(cid:449)s (cid:373)o(cid:448)e slo(cid:449)ly a(cid:374)d usually do(cid:374)"t kill people but they are hard to stop. As some of the liquid drops fall back to the ground, they may coalesce to. Small explosive eruptions form fire fountains form a lava flow: pyroclastic falls (ash fall) Breathing in ash can be deadly. Roofs collapse most dangerous problem, most fatalities are people trying to shelter. Avalanche of pyroclastic material, air, and gas. Next most common: explosive collapse of lava domes. Dome collapse: can be followed by pyroclastic flows racing downslope. The flow has a dense core of boulders which is hidden by the billows of ash. Pyroclastic flows usually stop in valleys but if big enough can flow over ridges.
