Radon and tilt measurements in a seismic area: Temperature effects |
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| Institution: | 1. Key Laboratory of Cloud Precipitation Physics and Severe Storms (LACS), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China;2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China;1. Johns Hopkins Applied Physics Laboratory, Laurel, MD 20723, USA;2. Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA;1. State Key Laboratory of Earth Surface Processes and Resource Ecology/Academy of Disaster Reduction and Emergency Management, Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China;2. Key Laboratory of Environmental Change and Natural Disasters, Ministry of Education, Beijing Normal University, Beijing 100875, China |
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| Abstract: | Since 1977 five tilt-strainmeter stations have been installed in the Friuli seismic area for the detection of tectonic deformations and pre co and post-seismic effects. In 1994 a station for Radon concentration measurements was installed with the aim to detect possible precursors. The noise effect due to rainfalls and atmospheric pressure variations was already stressed in previous papers. In this work the effect of temperature on both tilt measurements and Radon emanation is examined. A significant correlation between tilt and temperature is present on the annual behaviour, mainly due to thermoelastic effects although annual water table level variations can greatly influence the done results. On shorter periods (10–20 days) significant correlations also exist. Regarding the Radon measurements, an interpretative model has been reported. It relates the variation of the correlation coefficient sign with the temperature. Indeed Radon and temperature are positively correlated in winter and inversely correlated during the summer. |
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