abstract

A vertical array of four, three-component sets of seismometers was operated in a well at Grapevine, Texas. Comparison of the amplitude-depth behavior of noise with theoretical Rayleigh and Love wave amplitude-depth curves for the site showed that one has to assume the presence of various Love modes to explain the observations adequately. No such interpretation of the data was attempted for periods below 1 second because at these periods, the multiple coherences are small, which is an indication of the presence of numerous independent surface wave modes in the noise.

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