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AGU: Geophysical Research Letters

 

Keywords

  • radon

Index Terms

  • Seismology: General or miscellaneous
  • Mathematical Geophysics: Time series analysis
  • Nonlinear Geophysics: General or miscellaneous
  • Exploration Geophysics: Radioactivity methods

Abstract

GEOPHYSICAL RESEARCH LETTERS, VOL. 34, L15309, 6 PP., 2007
doi:10.1029/2007GL030065

Radon variability at the Elat granite, Israel: Heteroscedasticity and nonlinearity

S. M. Barbosa

Departamento de Matematica Aplicada, Faculdade de Ciências, Universidade do Porto, Portugal

G. Steinitz

Geological Survey of Israel, Jerusalem, Israel

O. Piatibratova

Geological Survey of Israel, Jerusalem, Israel

M. E. Silva

Departamento de Matematica Aplicada, Faculdade de Ciências, Universidade do Porto, Portugal

P. Lago

Departamento de Matematica Aplicada, Faculdade de Ciências, Universidade do Porto, Portugal

The basic statistical features of radon time series from continuous radon monitoring at the Elat granite, Israel are analysed. A similar analysis is carried out for ancillary and possibly related geophysical parameters for the Elat area. The results show that air temperature, precipitable water and long-wave radiation time series exhibit constant variance over the analyzed period, while radon time series, atmospheric pressure, short-wave radiation and total electron content exhibit heteroscedasticity. Furthermore, for radon and short-wave radiation the variability is associated with the overall mean level, while for atmospheric pressure such an association is not present. The analyzed radon time series not only are non-stationary but also nonlinear, reflecting the complex dynamics of radon emanation and transport in natural subsurface systems.

Received 18 March 2007; accepted 16 July 2007; published 15 August 2007.

Citation: Barbosa, S. M., G. Steinitz, O. Piatibratova, M. E. Silva, and P. Lago (2007), Radon variability at the Elat granite, Israel: Heteroscedasticity and nonlinearity, Geophys. Res. Lett., 34, L15309, doi:10.1029/2007GL030065.

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