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Recurrence quantification analysis of borehole temperatures: evidence of fluid convection
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SYSNO ASEP 0330791 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Recurrence quantification analysis of borehole temperatures: evidence of fluid convection Author(s) Čermák, Vladimír (GFU-E) ORCID, RID Source Title International Journal of Bifurcation and Chaos. - : World Scientific Publishing - ISSN 0218-1274
Roč. 19, č. 3 (2009), s. 889-902Number of pages 14 s. Language eng - English Country SG - Singapore Keywords borehole temperatures ; recurrence quantification analysis ; fluid intermittency ; periodic-chaotic transition Subject RIV DC - Siesmology, Volcanology, Earth Structure CEZ AV0Z30120515 - GFU-E (2005-2011) UT WOS 000266507100008 DOI 10.1142/S0218127409023366 Annotation To describe intra-hole fluid convection, fine-scale temperature-time variations were monitored at 25 depth levels within a 50 m long interval (80–130 m depth) in a slim experimental borehole in Sporilov (the Czech Republic). High-resolution temperature data were sampled with a 15 sec time interval for 1.6 up to 2.7 days. The time series obtained were from 10 000 to 16 000 data points. In the upper part of the investigated depth interval, the temperature time series showed a complex oscillation pattern with amplitudes of up to 45 mK (milliKelvin). This variation pattern is alternated with a "quiet" regime below 110 m depth, where temperature oscillations fall within 4–10 mK range. Workplace Geophysical Institute Contact Hana Krejzlíková, kniha@ig.cas.cz, Tel.: 267 103 028 Year of Publishing 2010
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