Figure 8.15 shows a surface wave from the 2002 MW 7.9 Denali earthquake in Alaska recorded near Sao Paulo in Brazil on a vertical-component station. ˜ (a) Is this most likely a Rayleigh or a Love...

Figure 8.15 shows a surface wave from the 2002 MW 7.9 Denali earthquake in

Alaska recorded near Sao Paulo in Brazil on a vertical-component station. ˜

(a) Is this most likely a Rayleigh or a Love wave? Why?

(b) Measure the average time and the time separation between successive waveform troughs over the interval from 3200 s to 3600 s. Use your results to make

a table of velocity as a function of the wave period (Hint: 1◦ = 111.19 km).

Is this a measure of group or phase velocity? How do your results compare

to the PREM predictions in Figure 8.6?