Preliminary spectral analysis of near-real-time radon data

Journal Article · Fri May 01 04:00:00 EDT 1981 · Geophys. Res. Lett.; (United States)

DOI:https://doi.org/10.1029/GL008i005p00449· OSTI ID:6361788

Mendenhall, M H; Shapiro, M H; Melvin, J D; Tombrello, T A

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.

• Research Organization: W. K. Kellogg Radiation Laboratory, Caltech, Pasadena, California 91125
• OSTI ID: 6361788
• Journal Information: Geophys. Res. Lett.; (United States), Journal Name: Geophys. Res. Lett.; (United States) Vol. 8:5; ISSN GPRLA
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
580201* -- Geophysics-- Seismology & Tectonics-- (1980-1989)
ATMOSPHERIC PRECIPITATIONS
CALIFORNIA
EARTHQUAKES
ELEMENTS
FLUIDS
FORECASTING
FOURIER ANALYSIS
FREQUENCY ANALYSIS
GASES
NATURAL RADIOACTIVITY
NOISE
NONMETALS
NORTH AMERICA
PRECURSOR
RADIOACTIVITY
RADON
RAIN
RARE GASES
SEISMIC EVENTS
SEISMICITY
USA
VARIATIONS
WESTERN REGION