How are earthquakes detected?

Seismic waves

When and earthquake occurs it generates seismic waves which radiate away from the rupture point like waves in a pond, but also travelling downwards through the earth. Scientists can detect and measure these vibrational waves at great distances.

Background science

p-wave Seismic waves

P-, S- and surface waves, how seismic waves travel, looking at seismograms.

Earthquake triangulation Locating earthquakes

Arrival times and velocity models.

Seismometers

Slinky seismometers Seismometers for use in schools

Earthquake sensors for schools. Some ideas for inexpensive seismometers.

Pendulum seismoscopes trace History of seismometer design

Historical development of seismometers.