Earth Sciences 1022A/B Lecture Notes - Lecture 11: Wave Power, Refraction, Seismic Wave
16 Apr 2020
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Document Summary
When body waves encounter a boundary (change in density or velocity), some of the wave energy will be reflected (bounce off) and refracted (bends as it transmits through) Seismic waves split into reflected and refracted phases at layer boundaries. The velocity of the wave propagation inside the blue area is slower. When earthquake happens, it will be recorded at different locations around the world. When we stack data records from many earthquakes and many stations, we observe many. Seismic waves (phases) arrive at different times consistent global seismic wave phases, which are generated by many layers" boundaries inside the earth (internal structure) Body (p- and s-) waves refract and reflect as they encounter boundaries inside the earth. There are many(!) global seismic phases that have bounced off or refracted from many boundaries inside the earth -> seismic waves image earth"s internal structure.
