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Recognition of environmentally caused variations in radon time series

Shapiro, M. H. and Rice, A. and Mendenhall, M. H. and Melvin, J. D. and Tombrello, T. A. (1984) Recognition of environmentally caused variations in radon time series. Pure and Applied Geophysics, 122 (2-4). pp. 309-326. ISSN 0033-4553. doi:10.1007/bf00874601 .

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Four techniques (pattern recognition, Fourier transformation, cross-correlation, and multiple linear regression) have been used to recognize nontectonic environmental factors affecting groundwater radon data collected by the Caltech automated geochemical network. Several factors, including air temperature, rainfall, water level, carbon dioxide concentration in the water, and barometric pressure, were found to correlate with radon level at some stations in the network. For example, approximately 60% of the variance in radon signal at one site studied (Pacoima) could be accounted for by nontectonic influences. However, it was not possible to correlate all the observed changes in radon concentration with nontectonic environmental variables. Some of the observed radon ‘anomalies’ did appear to be related to either regional changes in tectonic strain or some individual earthquakes. A model is developed to account for spike-like increases in radon caused by carbon dioxide emission.

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Additional Information:© 1985 Birkhäuser Verlag, Basel. Received 24th February 1984, revised 27th April 1984, accepted 21st May 1984. This work was supported by the United States Geological Survey through contract No. 14-08-0001-21268.
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Subject Keywords:Radon anomalies; Environmental effects; Time series; Fourier transform; Correlation with environmental factors; Earthquakes
Issue or Number:2-4
Record Number:CaltechAUTHORS:20141029-110618204
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:51001
Deposited By: Tony Diaz
Deposited On:29 Oct 2014 19:35
Last Modified:03 Oct 2019 07:28

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