²²²Rn activity in soil gas across selected fault segments in the Cantabrian Mountains, NW Spain

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• 作者：N. Kü ; nze ; ^{nadine.kuenze@uni-hamburg.de} ; M. Koroleva ; C.-D. Reuther
• 关键词：222Rn ; Aseismic fault ; Seismic fault ; Cantabrian Mountains
• 刊名：Radiation Measurements
• 出版年：2012
• 期刊代码：71_13504487
• 类别：ce
• 出版时间：May, 2012
• 卷：47
• 期：5
• 页码：389-399
• 文件大小：1147 K

摘要

²²²Rn activity in soil gas was measured across fault segments of the seismic active Ventaniella Fault and the seismic inactive Sabero-Gord贸n Fault in the Cantabrian Mountains, NW Spain, in order to investigate the variability of the ²²²Rn concentration. The sampling took place in summer and autumn 2010. During the autumn measurement program, an additional ²²²Rn soil gas mapping was carried out in the Sabero-Gord贸n research area. Zones of elevated ²²²Rn activity in the soil gas were identified by background ²²²Rn values of the geological formations used for mapping and local background values from ²²²Rn values outside the elevated ²²²Rn activity zones. Unexpectedly, the Sabero-Gord贸n Fault showed higher ²²²Rn activity, up to 441 kBqm^鈭?, compared to the ²²²Rn activity of the Ventaniella Fault which had a maximum of 106 kBqm^鈭?. Comparison of the results shows that the values measured in summer are about 5 times higher than the autumn values. This difference is not reflected in petrophysical soil parameters or meteorological conditions documented during the field measurements. Based on the results of our work we conclude that the magnitude of ²²²Rn concentration in soil gas is not an indicator of local seismic activity of the investigated faults. For the studied segment of the aseismic Sabero-Gord贸n Fault we suggest active genesis of pathways for gas migration driven by aseismic fault slip causing the elevated ²²²Rn activity in soil gas.