1887

Abstract

In Nuporanga locality (SP) occurred many induced earthquakes along 1970 decade, owing to drilling and<br>exploitation activities of pipe wells that crossed basaltic layers of Parana Basin. Since that, seismographs were<br>installed to detect earthquakes and feasible cause of phenomenon. At this work, the objective of radon (222Rn)<br>gas emanometry was detection and measurement of fractures azimuths near these wells. Emanometry profiles<br>near four wells were made to test the method. In each point of these profiles, were buried accumulation tubes,<br>separated by 5 meters, that accumulated Rn gas exhaled from soil, during 3 days. Using a Lucas alpha<br>scintillation cells, was possible to delineate, surely anomaly regions of Rn gas exhalation, considering counting<br>statistic errors and the noise of measurements systems. The content of U and Th in basaltic layers are<br>negligible and,therefore the emanation rate of Rn from soil should be low. Meanwhile, in some collecting point,<br>the observed value was relativelly high, that allowed to infer an probably fracture alignments in directions NE or<br>NW

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/content/papers/10.3997/2214-4609-pdb.215.sbgf231
1999-08-15
2021-10-19
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