In this lesson, students learn about different types of seismic waves ... to the direction of the waves. 4. Ask your students where they think the seismic waves of an earthquake originate.

They travel through the Earth in curved paths, but they change direction suddenly when they pass through the boundary between substances in different ... types of seismic wave. Surface waves ...

They detect the seismic waves ... There are four major types of seismograms: tectonic-like earthquakes; shallow, volcanic earthquakes; surface events; and harmonic tremors. Seismic instruments such as ...