EESA06H3 Chapter Notes - Chapter 4: Seismic Wave, Oceanic Crust, Continental Crust
Document Summary
Geophysics: applicaion of physical laws and principles to a study of the earth. Includes study of seismic waves and earth"s magneic ield, gravity and heat. Seismic reflection: return of some of the energy of seismic waves to the earth"s surface ater the waves bounce of a rock boundary. Relected waves recorded on seismogram show amnt. of ime for it to travel calculate depth of boundary. Seismic refraction: the bending of seismic waves as they pass from one material to another. Occurs only if velocity of seismic waves is diferent in each layer. Seismograph staion 1 receives seismic waves that pass directly through upper layer a. Seismic shot (seismographs set up in a line away from explosion) Finds distance btwn. point of transformaion and epicentre of earthquake: used to calculate depth to boundary. Advancing waves give of energy in all direcions and small part of it leaks upward into layer a.
