Spurious velocity changes caused by temporal variations in ambient noise frequency content

  title={Spurious velocity changes caused by temporal variations in ambient noise frequency content},
  author={Zhongwen Zhan and Victor C. Tsai and Robert W. Clayton},
S U M M A R Y Ambient seismic noise cross-correlations are now being used to detect temporal variations of seismic velocity, which are typically on the order of 0.1 per cent. At this small level, temporal variations in the properties of noise sources can cause apparent velocity changes. For example, the spatial distribution and frequency content of ambient noise have seasonal variations due to the seasonal hemispherical shift of storms. Here, we show that if the stretching method is used to… CONTINUE READING


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