GLY 2010C Lecture Notes - Lecture 21: Seismometer, Epicenter, Seismogram
Document Summary
R waves are p waves that intersect the land surface. They cause the ground to ripple up and down like water. What is a seismograph? an instrument that records seismic motion. How do seismographs work? a weighted pen on a string traces movement of the frame. vertical motion records up and down movement. horizontal motion records back and forth motion. What do modern seismographs use? a magnet and an electric coil. They record data digitally and allow us to detect ground motion that people cannot see. Seismographs measure __________ and the magnitude of ___________ wave arrivals motion. What is a seismogram? data recording earthquake wave behavior. What is the order in which earthquake waves arrive at the station. Data from 3 or more stations pinpoints the _________ epicenter. What is this time delay used to establish distance from the epicenter. time delay is used to establish the distance. Can p wave and s wave arrival times be graphed? yes.
