Portal de Periódicos da CAPES

INVESTIGATION OF INFORMATIVE VALUE OF VOLUME RADON ACTIVITY IN SOIL DURING BOTH THE STRESS BUILD UP AND TECTONIC EARTHQUAKES IN THE SOUTH KURIL REGION

2019; Issue: 4(44) Linguagem: Inglês

10.31431/1816-5524-2019-4-44-73-83

1816-5532

S.V. Biryulin, И. А. Козлова, A. K. Yurkov,

earthquake and tectonic studies

The authors analyzed monitoring data of VRA (volume radon activity) from the stations Yuzhno-Kurilsk and Kurilsk collected since 2011. The data allowed us to analyze the dependence of seismic events in the variations of the VRA. In the analysis we used only events that answer the relationship between earthquake magnitude and the logarithm of the distances greater than 2.5. In order to characterize the position of the moment of the seismic event on the VRA curve, the duration of the anomaly, the time from the beginning of the anomaly to the tectonic event, the time from the extremum to the event, and the time from the end of the anomaly to the event were determined. The analysis showed that the distinctive variations in the volume activity of soil radon for the setting of the South Kuril region begin a few days prior to the event that causes them, i.e. relate to the short-term precursor effects; tectonic events on the curve of the change of the VRA are not observed on the ascending branch of the anomaly; tectonic events with different distances from a recording station are observed on different parts of the VRA curve; the radius of the near field is 50-70 kilometres.