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Three seismograph recordings of vertical earth motion from the KCK collapse event are shown above. They were recorded near Leonard, OK (green), near Vivian, OK (blue), and near Slick, OK (black). The three seismographs are 368 km/229 miles (Leonard), 400 km/249 miles (Slick), and 429 km/267 miles (Vivian) from the KCK event. The frequencies of seismic waves from this collapse event were noticably lower than those from an earthquake. The above seismograms were filtered through a 0.5 Hz. to 3.0 Hz. bandpass. The seismograms and spectrograms below are from a Texas earthquake and the Kansas city collapse. The seismograms are unfiltered. The left hand 0 to 100 axis indicates energy in hertz. The two events were about the same distance from Leonard, Oklahoma where they were recorded at 200 samples per second. The differences are noticable on the seismograms (labelled "Vertical Ground Velocity"). The spectrogram of the Texas earthquake resembles a fountain, with the fountain reaching almost to 90 Hertz. Most of the KCK collapse energy is low frequency, three Hertz and below. The yellow layer around 50 Hertz is machinery vibration. Note that this layer does not fountain upward from low to high frequency.
