GEOG 1350 Lecture Notes - Lecture 1: Stony-Iron Meteorite, Blast Wave, Infrasound
30 Nov 2017
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Document Summary
Infrasound sound waves that are too low to hear. Deep base tones reflecting huge amounts of energy. Clues - can travel for a long time. Low frequency waves circled the world a few times from this blast. The stations with sensitive sensors that detected this were larger waves than ever seen before: describe the composition of a stony iron meteorite. They have so much metal in them so they weigh more than other meteorites. So dense, the type of damage is incredible. The chelyabinsk meteor fragments were found to be 90% rock and 10% metal. Composition of asteroid is important for effects. (strength and density is important: a denser stronger one will fragment lower in the atmosphere where a weak one will fragment high in the atmosphere). Revealed: interior untouched by the atmosphere pressure can exceed the strength of the asteroid. Meteorite fragments have internal cracks (when hit atmosphere it was like hitting a brick wall and therefore exploded).
