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A SOLUTION TO THE PROBLEM OF INTERPRETING VERY LONG TIME SERIES OF AMBIENT NOISE AS MEASURED AT VERY SPARSE NETWORKS

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Figure

Figure 1.1: The IRIS database has expanded exponentially over time as assorted projectsinvolving long- and short-term installations of seismometers are completed or underway.
Figure 2.1: The full spectrum for a twenty-minute long signal recorded at station AKUT onan Streckeisen STS-2 broadband seismometer with sampling interval of 0.02 s
Figure 2.3: A spectral peak is evident at approximately 0.036 Hz (period of approximately27.8 s) in the spectral amplitude
Figure 2.4: The single and double frequency microseisms are evident in the plot of thespectrum for the recording at AKUT at approximately 0.06 Hz and 0.12 Hz, respectively.The SF amplitude is less than that of the DF
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