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Published May 1981 | Published
Journal Article Open

Preliminary spectral analysis of near-real-time radon data

Abstract

Fast Fourier analysis of the near-real-time radon data collected since 1977 by the Caltech automated radon-thoron monitoring system has been carried out in order to determine if any characteristic frequency components are present that can be associated either with precursors to seismicity or with environmental factors. Preliminary results indicate that during "quiet" periods with low seismicity and no rainfall the spectral power is distributed as 1/f. Before four local earthquakes a departure from this 1/f behavior was observed at low frequency. During periods of heavy rainfall an increase in both low and high frequency power was observed. The spectral power of the large radon anomaly observed prior to the October 15, 1979 Imperial Valley earthquake was found to have a 1/f distribution but with power at all frequencies about four times greater than that of data from "quiet" periods.

Additional Information

Copyright 1981 by the American Geophysical Union. (Received February 12, 1981; accepted April 21, 1981.) Paper number 1L0700. The work in this paper was supported in part by U. S. Geological Survey Contracts 14-08-0001-17734 and 14-08-001-19752 at Caltech.

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August 19, 2023
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