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Iskalni niz: "avtor" (Miloš Briestenský) .

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1.
Radon concentration variability and microclimate controls in two Slovene show caves
Stanka Šebela, Miloš Briestenský, Uroš Novak, 2026, izvirni znanstveni članek

Povzetek: The study presents 8-years long dataset (2017–2025) of high-resolution radon concentration measurements in Županova Jama and 2-years long dataset (2022–2024) in Postojnska Jama. Radon concentrations from two show caves were compared with outside and cave air temperature as well as atmospheric pressure to assess diurnal and seasonal variability. Županova Jama showed consistently higher radon levels with a 2023 mean of 4030 Bq/m³, compared to 2278 Bq/m³ in Postojnska Jama. Diurnal variations occurred in both caves, with night values typically higher in Županova Jama, while Postojnska Jama displayed day and night concentrations more balanced depending on ventilation regimes. In Postojnska Jama, summer radon maxima followed outside air temperature peaks with a 12–18 h lag. Seasonally, both caves showed higher radon concentrations in summer and lower in winter. Long-term monitoring near Županova Jama revealed an increase in mean outside air temperature (+0.86 °C from 2018 to 2024) and a parallel rise in radon, particularly in 2023–2024. The influence of atmospheric pressure was found to be seasonally dependent at both sites, with higher radon concentrations during periods of stable summer pressure and lower values during higher winter oscillations. Exposure limits indicate safe annual times of 512 h for Postojnska Jama and 284–289 h for Županova Jama, values not hazardous for visitors but important for cave guides. The findings underline the importance of continuous monitoring and cave-specific ventilation management to mitigate long-term health risks.
Ključne besede: radon concentration, air temperature, atmospheric pressure, radiation exposure levels, Postojnska jama, Županova Jama, Slovenia
Objavljeno v DiRROS: 24.05.2026; Ogledov: 183; Prenosov: 209
.pdf Celotno besedilo (10,50 MB)
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2.
Central Europe tectonic hiatus 2015–2019
Miloš Briestenský, Stanka Šebela, Petar Stefanov, Uroš Novak, 2026, izvirni znanstveni članek

Povzetek: Long-term extensometric monitoring across Central Europe reveals a pronounced tectonic hiatus between 2015 and 2019. Using high-resolution data from the EU TecNet network of optical – mechanical TM-71 and TM-72 extensometers installed along major fault zones, we document a widespread attenuation or cessation of fault-related micro-displacements that coincided with a marked decrease in regional seismicity. The hiatus was most prominent in the Western Carpathians, where fault movements were arrested at nearly half of the monitored sites, preferentially affecting major NNE – SSW-striking fault systems that represent the principal structural grain of the region. Despite the overall quiescence, extensional fault opening developed at several sites since 2015, followed by significant vertical subsidence recorded across much of the Western Carpathians in 2018. Similar patterns of tectonic quiescence were observed in the Bohemian Massif, Slovenia, and Bulgaria, indicating that the phenomenon extended over large parts of Central and Southeastern Europe. The temporal evolution of deformation and its correspondence with seismicity suggest that the 2015–2019 hiatus reflects a transient regional-scale reorganisation of the stress field, likely linked to variations in plate-boundary forcing, rather than a response to climatic effects or local processes.
Ključne besede: faulty activity, extensometric monitoring, seismic quiescence, Central Europe, adriatic microplatee
Objavljeno v DiRROS: 23.03.2026; Ogledov: 325; Prenosov: 354
.pdf Celotno besedilo (13,39 MB)
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