A SEISMIC EXPERIMENT This coming Saturday and Sunday (September 23 and 24 you will be conducting a high resolution land seismic survey over flat terrain in Godlen Meadow in order to image sub-surface geology at a depth of no more than 500 m. It is imperative that you be able to resolve layers 1m thick amongst shales and sandstones whose average velocities are about 2000 m/s. Your equipment is as follows: * 24-channel seismograph * 24 sets of 40 Hz geophones at 3-m spacing (plus cables and whatever else you need for proper recording). N.B. 40-Hz phones can pick up frequencies from 40 Hz to as high as 200 Hz. (a) Will these geophones serve the purpose or will you need geophones that can pick up higher frequencies or will you have to decrease your resolution (Please explain)i (b) What sampling interval do you need? ( Justify) (c) What will you Nyquist frequency be? ( Justify) (d) What will be the shotpoint and receiver spacing in order to produce a maximum fold of twelve CMP/CDP every 3 m. ( Justify) (For graduate students only) (e) As in real life I want you to determine a "What If" situation, which happened to me: What if you had to decrease your receiver spacing to 1.5m but kept your shotpoint spacing at 3m? What will this do to the fold, and your vertical and horizontal resolution. Please explain and justify with calculation results if necessary. Please show your work. (Due 9/25/2000 at 3.30 p.m.)