Go To SeismoTools and the MichSeis Homepage for more information. This is the location of the seismograph station which records the earthquake. Its location is usually specified in terms of its latitude and longitude or in terms of distance and azimuth from the earthquake epicentral location. Surface Waves Surface waves are seismic waves which travel along the surface of the earth. Both travel at velocities which are much slower than that of body waves.
Surface waves are easy to see on seismograms as they have large amplitudes.
See also Body Waves . Go to What are Seismic Waves by UPSeis to learn more about Surface Waves.