A New Tool for Seismologythe Cumulative Spectral Power
Abstract
The power spectral density (PSD) function is commonly used to specify seismometer performance. It is derived from the FFT of acceleration and correction is made for the transfer function of the instrument that generated the data. As with any such spectrum of density (`per Hz') type, the noise inherent to a PSD is large. This article illustrates the value of a function that is derived from the PSD and for which the influence of noise is significantly reduced. Called the cumulative spectral power (CSP), it is obtained from the PSD through the noisereducing process of integration. The maximum of the CSP (corresponding to the longest graphed value of the period) provides a means for estimating the total vibrational power of the earth. The present author has significantly simplified the process of PSD generation. Thus routine graphing is straightforwaredof first the FFT, followed by the generation of both a PSD and its associated CSP. The unique properties of the CSP make it valuable for the study of a variety of earth dynamics. For example, the strking simplicity of a CSP graph generated from a record containing a strong teleseismic earthquake is undoubtedly important to the development and refinement of any viable theory of earthquake dynamics.
 Publication:

arXiv eprints
 Pub Date:
 May 2007
 DOI:
 10.48550/arXiv.0705.1100
 arXiv:
 arXiv:0705.1100
 Bibcode:
 2007arXiv0705.1100P
 Keywords:

 Physics  Geophysics
 EPrint:
 14 pages, 9 figures