about seismic (geophysic)
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Geophys 4231: Homework 1 (Due 9/15/2014)
1. a. A common compressional wave velocity for saturated, unconsolidated materials is 1400 m/s. If a seismic wave with a frequency of 10 Hz is traveling through this material, what is the wavelength of the wave? What is the wavelength of a wave with a frequency of 100 Hz.
b. If the wave propagates through bedrock with a velocity of 4500 mis, what is the wavelength? What is the wavelength of a wave with a frequency of 100 Hz?
c. Compare the above results and explain what determine the wavelength of a wave?
2. A P-wave is traveling through a rock unit (Vp=1200 m/s). This rock unit is in contact with another unit that has greater seismic wave velocities (Vp=3800 m/s; Vs=1900 m/s). At what angle must a ray strike the contact between these two units to produce a compressional head wave? A shear head wave?