Combinations of Strain and Pendulum Seismographs to Enhance Long Period P and Rayleigh Waves at Queen Creek, Arizona
TELEDYNE GEOTECH ALEXANDRIA VA SEISMIC DATA LAB
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Analog analysis techniques have been applied to the long-period peak response at 25 seconds period strain and pendulum system at QCAZ Queen Creek, Arizona. The purpose is to determine the effectiveness period P wave and Rayleigh wave signals from earthquakes. The long-period pendulum instruments at QCAZ are used as a standard for comparison. Outputs of the strain and pendulum seismographs are combined using an analog computer. The resultant output is then compared for a sample of forty-four earthquakes to the appropriate pendulum to establish signal-to-noise ratio gain or loss. The lack of reduction of the rms noise amplitude is principally a result of strain system noise at periods greater than 16 seconds.
- Seismic Detection and Detectors