Geography 2144A/B Lecture Notes - Lecture 10: Blast Wave, Infrasound, Low Frequency
6 Nov 2017
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Document Summary
Sound waves that are too low for us to hear. As explanations get bigger the tone of the sound gets lower until it is below the level that human ear can detect. Can travel a long distance it atmosphere without being absorbed. As hurdling through atmosphere gets vertices of air that scour the rock. The chelyabinsk meteor fragments were found to be 90% rock and 10% metal. What matters most is strength and density. Low density will break up and explode further from earth. Denser and strong asteroid will break up at a lower altitude meaning it is closer to the earth. Asteroids like this are much less resilient. May have met its demise early in its entry. Meteorite fragments have many internal cracks sudden and explosive break up of rock. When hit atmosphere, it is like hitting a brick wall.
