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Comparative Measurements of Local Seismic Rotations by Three Independent Methods
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SYSNO ASEP 0534817 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Comparative Measurements of Local Seismic Rotations by Three Independent Methods Author(s) Brokešová, J. (CZ)
Málek, Jiří (USMH-B) RID, ORCID, SAIArticle number 5679 Source Title Sensors. - : MDPI
Roč. 20, č. 19 (2020)Number of pages 23 s. Publication form Online - E Language eng - English Country CH - Switzerland Keywords seismic rotation ; rotational seismometer ; Rotaphone ; seismic array Subject RIV DB - Geology ; Mineralogy OECD category Geology R&D Projects LTAUSA19083 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Open access Institutional support USMH-B - RVO:67985891 UT WOS 000586718000001 EID SCOPUS 85092217091 DOI 10.3390/s20195679 Annotation A comparative active experiment that is aimed at collocated measurement of seismic rotation rates along three orthogonal axes by means of three different methods is described. The rotation rates in a short-period range of 6-20 Hz were obtained using three different methods: the 6C Rotaphone sensor system developed by the authors, the commercial R-1 rotational sensor by Eentec, and a small-aperture array of twelve standard velocigraphs in a rectangular arrangement. Those three methods are compared and discussed in detail. A medium-size quarry blast was used as a seismic source. At a distance of approximately 240 m, the rotation rates reached an amplitude of the order of magnitude of 10(-4)-10(-5) rad/s. The array derived rotation rates displayed serious limitations, as clearly documented. The R-1 instruments have shown certain technical problems that partly limit their applicability. The measured rotation rates were compared to the relevant acceleration components according to rotation-to-translation relations. Out of all the three methods, the records best matching the acceleration components were made by Rotaphone. The experiment also revealed that rotation rates in the given short-period range noticeably changed over a distance as short as 2 m. Workplace Institute of Rock Structure and Mechanics Contact Iva Švihálková, svihalkova@irsm.cas.cz, Tel.: 266 009 216 Year of Publishing 2022 Electronic address https://www.mdpi.com/1424-8220/20/19/5679
Number of the records: 1