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Seismic Waves.docx

3 Pages

Course Code
ASTR 1101

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Seismic Waves  two types of seismic waves : 1. P-waves o longitudinal pressure waves  can spread into both solids and liquids. o have their direction of motion refracted by interior density 2. S-waves o transverse waves  can spread into solids but not into liquids Structure of the Interior  The crust of the earth is approx. 10 kilometers wide  region between the core and the crust : mantle  upper part of the mantle and the crust together : thelithosphere.  underneath the lithosphere (crust and upper mantle ) is a plastic region consistency : aesthenosphere approx. 1 billion years ago the Earth was melted by heat arising from
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