Significant improvements in the performance of short-period seismograph recordings are sometimes obtained in shallow holes (<300 m). Wind noise attenuates rapidly with depth and becomes insignificant at depths of 60 m or less. In the presence of low-velocity weathered layers, the normal background noise decays rapidly with depth and significant improvements in signal-to-noise ratios are obtained. In the absence of a low-velocity zone, only a small attenuation in the background noise level is obtained. Little or no wind noise is converted into traveling seismic waves.

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