Abstract
The comparison of kinematics and dynamic parameters of radon and molecular hydrogen concentration in sub- soil air on the stations network at the Petropavlovsk-Kamchatsky geodynamic proving ground with seismicity of the northern flank of the Kuril-Kamchatka subduction zone was fulfilled in the period from July till August 2004. On the basis of correlation analysis of the regional seismicity and variations of radon flux density calcu- lated using the data of gas-discharge counters of STS-6 type and SSNTDs it was shown that the radon mass transfer abnormal variations are conditioned by both regional seismicity in total and the subduction zone of prov- ing ground. The azimuths of «geodeformation waves» coming to the registration points are calculated during clearly expressed anomaly beginnings, which coincide with directions to earthquake epicenters taking place at the same time. The geochemical anomalies recorded are presumptively deformative by nature and can be condi- tioned by processes of «quasi-viscous» flow of the lithosphere during rearrangement of tectonic stress fields of the subduction zone. The short-term (predicted time T <14 days) precursor of the earthquakes swarm was re- vealed in hydrogen dynamics on August, 4-5 (four earthquakes had M≥ 5.3 and epicentral distance about 130 km from the Paratunka base station).
Highlights
Increasing seismotectonic deformations preceded this swarm in the Avachinskaja «key» area which triggered an appropriate decrease of radon flux density at the Paratunka graben area and an 8 day anomaly in a hydrogen concentration at the PRT station
We will presumably consider the anomaly as a reaction of a soil radon field on the rock deformation resulting from quasi-viscous flow of geological material
This assumption is supported by the fact that the azimuth of the anomaly incoming to the radon monitoring stations is close to the direction towards the epicenter area of the earthquakes swarm of August 4
Summary
For half a century work on soil radon recording was carried out in different geological structures using different equipment and showed the benefits of the seismic-emanation method (Dubinchuk, 1991; King, 1991; Rudakov, 2003). At the PRT station the Rn concentration was measured in alluvial-sandy sediments at a depth of one meter from the surface at two points: aeration zone Radon concentration measured by REVAR radiometers at the stations a) PRT and b) IKR, INS, LVCh; c) by SSNTDs at different depths (i) and calculated radon flux density (ii); d) meteorological parameters. To reveal the common tendencies in behavior of radon concentration within Paratunka graben the aggregated signals were constructed on the basis of a four-dimensional data sequence (2 measure points of Stations PRT and IKR) with the use of Ljubushin’s methods (Ljubushin, 1998).
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