http://hdl.handle.net/2122/591 Search the Channel search http://www.earth-prints.org/simple-search http://hdl.handle.net/2122/3871 Title: Radon and its decay product activities in the magmatic area and the adjacent volcano-sedimentary Intrasudetic Basin <br/> <br/>Authors: Solecki, A. T.; Institute of Geological Sciences Wrocl⁄aw Univeristy, Wrocl⁄aw, Poland; Puchala, R.; Institute of Geological Sciences Wrocl⁄aw Univeristy, Wroclaw, Poland; Tchorz, D.; Institute of Geological Sciences Wrocl⁄aw Univeristy, Wroclaw, Poland <br/> <br/>Abstract: In the magmatic area of Sudetes covering the Karkonosze granite and adjacent volcano-sedimentary Intrasudetic Basin a study of atmospheric radon activity was performed by means of SSNTD Kodak LR-115. The study was completed by gamma spectrometric survey of eU and eTh determined by gamma activity of radon decay products 214Bi and 208Tl respectively. In the case of the western part of the Karkonosze granite area the radon decay products activity in the granitic basement was found to be as high as 343 Bq/kg for 214Bi and 496 Bq/kg for 208Tl respectively. Atmospheric radon content measured by means of Kodak LR115 track detector at the height of 1.5 m was found as high as 70 Bq/m3 in the regions, where no mining activities took place. However in the eastern part of the granitic massif in the proximity of abandoned uranium mine atmospheric radon content was found to be 6000 Bq/m3. In the case of sedimentary basin where sedimentary sequence of Carboniferous rocks has been penetrated by younger gases and fluids of volcanic origin uranium mineralization developed. The region known from its CO2 outburst during coal mining activity is characterized by good ventilation of the uranium enriched geological basement resulting in increased atmospheric radon activity being in average 72 Bq/m3. In the vicinity of coal mine tailing an increase up to 125 Bq/m3 can be observed. Seasonal variations of atmospheric radon content are influenced in agricultural areas by cyclic cultivation works (plough) on soils of increased uranium content and in the case of post-industrial brownfields varying rates of radon exhalation from tailings due to different meteorological conditions. http://hdl.handle.net/2122/3870 Title: Measuring radon in soil gas and groundwaters: a review <br/> <br/>Authors: Papastefanou, C.; Aristotle University of Thessaloniki, Atomic and Nuclear Physics Laboratory, Thessaloniki, Greece <br/> <br/>Abstract: Instruments for the measurements of radon and its decay products in earthquake research are based mostly on the detection of alpha particles. The devices and methods used depend on whether the techniques measure radon or radon decay products, and the duration of the measurements, of which there are three types: i) grab or instantaneous, ii) integrating and iii) continuous. Other criteria used in the design of these instruments are field measurements applicability, portability, convenience and reliability. With the recent increased demand for radon and radon decay products measurements, instruments development has focused on the design of appropriate devices for short-term measurements, as well as on more complex and sophisticated instruments for long-term measurements used in radon research for geophysical, geochemical and hydrological studies. http://hdl.handle.net/2122/3869 Title: Hydrological influences on long-term gas flow trends at locations in the Vogtland/NW Bohemian seismic region (German-Czech border) <br/> <br/>Authors: Koch, U.; Saxon Academy of Sciences (SAW) at Leipzig, Research Group Bad Brambach/Freiberg, Germany; Heinicke, J.; Saxon Academy of Sciences (SAW) at Leipzig, Research Group Bad Brambach/Freiberg, Germany <br/> <br/>Abstract: One of the typical methods for the identification of seismo-hydrological effects is to monitor changes in the free gas flow throughout springs or mofettes. For several years, the gas flow regime of mineral springs at Bad Brambach (Germany) and mofettes in the Nature Park Soos (Czech Republic) and its dependence on hydro-/meteorological parameters have been studied. The mineral spring ‘Wettinquelle’, Bad Brambach, is a well-known seismo- hydrologically sensitive location for swarmquakes at a special epicentral area of NW Bohemia. Since 2000, a slight upward trend in the gas flow of three Bad Brambach mineral springs has been observed, which became stronger after the ‘Eisenquelle’ spring capture reconstruction (winter 2003/2004). Similar behaviour could be detected at a mofette in Soos. The results correspond to a 3He/4He mantle ratio increase in gases at mofettes in the Cheb Basin (CZ) traced by other authors for more than 12 years, and could give hints for a higher degassing activity of the magma body below that area. Common and special properties in the degassing regimes of the Bad Brambach and Soos locations are discussed. It is demonstrated that the long-term gas flow trend was interrupted in 2003 because of very low groundwater levels. This effect was amplified by the artificial groundwater lowering during the ‘Eisenquelle’ spring capture reconstruction. http://hdl.handle.net/2122/3868 Title: The nexus of soil radon and hydrogen dynamics and seismicity of the northern flank of the Kuril-Kamchatka subduction zone <br/> <br/>Authors: Firstov, P. P.; Institute of Volcanology and Seismology FEB RAS, Petropavlovsk-Kamchatsky, Russia; Yakovleva, V. S.; Tomsk Polytechnic University, Tomsk, Russia; Shirokov, V. A.; Institute of Volcanology and Seismology FEB RAS, Petropavlovsk-Kamchatsky, Russia; Malysheva, O. P.; Institute of Volcanology and Seismology FEB RAS, Petropavlovsk-Kamchatsky, Russia <br/> <br/>Abstract: The comparison of kinematics and dynamic parameters of radon and molecular hydrogen concentration in subsoil 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 calculated 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 proving 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 conditioned by processes of «quasi-viscous» flow of the lithosphere during rearrangement of tectonic stress fields of the subduction zone. The short-term (predicted time Τ <14 days) precursor of the earthquakes swarm was revealed in hydrogen dynamics on August, 4-5 (four earthquakes had M≥5.3 and epicentral distance about 130 km from the Paratunka base station).