Ch.4: Monitoring Earthquakes

seismogram

record of earthquake’s seismic waves produced by seismograph

Ring of Fire

vast geological area of activity

how a seismograph works

seismic waves cause a simple seismograph drum to vibrate, which in turn cause the pen to record the drum’s vibrations

how seismogram shows earthquake waves

it records vibrations from an earthquake

how seismographs record earthquakes

seismic waves cause seismograph’s drum to vibrate, which causes the pen to record the vibrations

earthquake data seismograph reveals

earthquakes often occur along plate boundaries

earthquake risk

depends on how close a location is to a plate boundary

subduction of fault

one plate is forced under another

with plate tectonics

earthquakes are closely linked