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Figure 2 – Wave-test data recorded for the purpose of analyzing signal frequency
bandwidth, identifying coherent and ambient noise modes and quantifying
signal-to-noise character of seismic data across a prospect area. In this
example, closely spaced test-data traces have been summed to represent data
acquired with a geophone array length of 110 feet (33.5 meters). The apparent
velocities of several modes embedded in the test data are labeled in units of