1. Introduction to Seismograms

How many seismograms are recorded at a station?

• 2

• 1

• 3

During a real earthquake, how can a station move? In which direction?

• vertical only

• All three types of motion occur

• east /west only

• North / south only

What type of wave is a P wave if it has a compressive motion?

• Push and Pull (longitudinal)

• Side to Side (Transverse)

If S waves travel in a perpendicular motion, what type of wave is an S wave?

• Side to Side (Transverse)

• Push and Pull (Longitudinal)

Which wave is recorded FIRST on a seismogram? 

• S wave

• Surface wave

• P wave

Which wave appeared to have the strongest impact on the recording station?

• Surface wave

• S wave

• P wave