LECTURE 7 OUTLINE - ELASTIC WAVES (updated 11/10/97)
Instructor: Professor Barbara Romanowicz
Director of Seismological Laboratory
Office Hours: Thursday 2-4 pm , upon appointment only
475 Mc Cone Hall
ELASTIC WAVES
References:
Bolt, Earthquakes, Chapter 1.
Bolt, Earthquakes and geological discovery, Chapter 2
Richter, Elementary Seismology, Chapter 6, 22
1. Elastic waves
Elastic behavior of rocks, Hooke's law
Example: the motion of a spring
P and S waves
2. Properties of waves
Frequency, period, wavelength
Harmonic Motion
Phase, amplitude
3. Surface waves
Rayleigh, Love
4. Speeds and propagation of seismic waves
Rigidity, incompressibility
Anisotropy
Reflection,refraction, diffraction
geometrical spreading
resonance and free oscillations
5. Earthquake Waves in Succession
Three component seismograms: examples
Def.: short distances, large distances: local and teleseismic observations
units for epicentral distance
Ray Paths
Travel Time curves