Radon in soil anomaly observed at Los Azufres geothermal field,Michoacan: a possible precursor of the 1985 Mexico earthquake (Ms = 8.1) |
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| Authors: | N Segovia S de la Cruz-Reyna M Mena E Ramos M Monnin J L Seidel |
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| Institution: | (1) ININ, Ap. Post. 18-1027, 11801 Mexico, D.F.;(2) IGFUNAM, Ciudad Universitaria, 04510 México, D.F.;(3) CNRS, IN2P3, BP 45/F, 63170 Aubiere, France |
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| Abstract: | A radon anomaly in a nuclear track detector placed on a fault was detected prior to the destructive (Ms = 8.1) Mexican earthquake of 19 September 1985. The fault is a structural feature of the geothermal field  Los Azufres , 260 km NE of the epicentral area. Since no other phenomenon can be found as a possible cause for the radon anomaly, it is proposed that preseismic regional stress perturbations may produce changes in the fluid transport patterns at the fault, suggesting that radon measurements in similar conditions could provide a good precursor in high seismic risk areas. |
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| Keywords: | Earthquake precursors radon anomaly  track detectors" target="_blank">gif" alt="agr" align="BASELINE" BORDER="0"> track detectors |
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