Deb Argha, Gazi Mahasin, Ghosh Jayita, Chowdhury Saheli, Barman Chiranjib
School of Studies on Environmental Radioactivity and Archaeological Sciences, Jadavpur University, Kolkata 700032, India.
Centre for Astroparticle Physics and Space Science, Bose Institute, Block-EN, Sector-V, Bidhannagar, Kolkata 700091, India.
J Environ Radioact. 2018 Apr;184-185:63-70. doi: 10.1016/j.jenvrad.2018.01.009. Epub 2018 Jan 30.
The present paper deals with monitoring soil radon-222 concentration at two different locations, designated Site A and Site B, 200 m apart at Jadavpur University campus, Kolkata, India, with a view to find possible precursors for the earthquakes that occurred within a few hundred kilometers from the monitoring site. The solid state nuclear track detector CR-39 has been used for detection of radon gas coming out from soil. Radon-222 time series at both locations during the period August 2012-December 2013 have been analysed. Distinct anomalies in the soil radon time series have been observed for seven earthquakes of magnitude greater than 4.0 M that occurred during this time. Of these, radon anomalies for two earthquakes have been observed at both locations A and B. Absence of anomalies for some other earthquakes has been discussed, and the observations have been compared with some earthquake precursor models.
本文论述了在印度加尔各答贾达普大学园区相距200米的两个不同地点（分别指定为A点和B点）监测土壤中氡-222浓度，目的是寻找在距监测点几百公里范围内发生的地震可能的前兆。固态核径迹探测器CR-39已被用于探测从土壤中逸出的氡气。对2012年8月至2013年12月期间两个地点的氡-222时间序列进行了分析。在此期间发生的7次震级大于4.0 M的地震中，在土壤氡时间序列中观测到了明显的异常。其中，在A点和B点都观测到了两次地震的氡异常。讨论了其他一些地震没有异常的情况，并将这些观测结果与一些地震前兆模型进行了比较。
