Provide short paragraph answers with description of the figures (what is shown) and explanation of your results / observations.
Utilze Matlab script seismic_filter.m to examine seismic traces and filter unwanted noise. Matlab reads seismic in file “data.mat” and calls the script “plotseismic.m” to plot the data.
Take a look at the time-domain traces (figure 1). Do you know what is the dominant frequency of the data?
What data frequencies can you see in the frequency spectrum (figure 2)? Comparing them to the dominant frequencies found in the time domain data, how do they compare?
Decide on an appropriate cutoff frequency for removing high frequency noise. Use a cutoff frequency of 100 Hz to view the data, despite the fact that we know it is excessive. Then, re-run the test with the cutoff frequency you want. What was your pick of the cutoff and in what way do the filtered data compare to the original data (figure 3)?
Giving an average seismic velocity of 2200 m/s, what is the dominant of the S data?