EESA06H3 Chapter 4: Chapter 4 Notes
Document Summary
seismic reflection-return of some of the energy of seismic waves to the earth"s surface after the waves bounce off a rock boundary. waves reflect off of the boundary between two layers of rocks and reflects back to a recording device called a seismogram. The seismogram measures the amount of time it took the waves to reflect and come back to it to measure the depth of the boundary. seismic refraction- the bending of seismic waves as they pass from one material to another. As the seismic wave strikes a rock boundary, a lot of the wave travels through i, and changes direction. seismograph stations receive the direct wave before the refracted one. many different seismographs can be set up in a row to record the velocities and depths of the waves. In a thick layer of rock, the increasing pressure with depth changes the wave velocity, making the waves curve.
