SIO15-10: Lecture 7 EQ Seismology and Hazard Mitigation!
• primary waves/arrive first at a station!
• compressional!
• particle motion in propagation direction!
• like sound waves!
P Waves!
Fig. 4.18
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Seismology Lecture: P, S, and Surface Waves in Earthquakes, Slides of Geology
An overview of different types of seismic waves, including primary (p) and secondary (s) body waves, and surface waves such as love and rayleigh waves. The particle motion and propagation characteristics of each wave type, as well as their depth decay and relative magnitudes.
Typology: Slides
2012/2013
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SIO15-10: Lecture 7 EQ Seismology and Hazard Mitigation
- primary waves/arrive first at a station
- compressional
- particle motion in propagation direction
- like sound waves
P Waves
Fig. 4.
SIO15-10: Lecture 7 EQ Seismology and Hazard Mitigation
- secondary waves/arrive second
- shear waves
- particle motion perpendicular to propagation direction
- like waves on a rope
S Waves
Fig. 4.
SIO15-10: Lecture 7 EQ Seismology and Hazard Mitigation
- arrive just after body waves
- combination of reflected S waves
- particle motion perpendicular to propagation
- motion decreases exponentially with depth
- like spikes in a wheat field
Surface Waves: Love Waves
Image: S. Marshak “Earth, Portrait of a Planet”
SIO15-10: Lecture 7 EQ Seismology and Hazard Mitigation
- arrive last
- combination of reflected P and S waves
- retrograde elliptical particle motion
- motion decreases exponentially with depth
- like water waves
Surface Waves: Rayleigh Waves
Fig. 4. largest signal most damaging wave retrograde R. waves prograde water waves