Next Article in Journal
Short-Term Foreshocks as Key Information for Mainshock Timing and Rupture: The Mw6.8 25 October 2018 Zakynthos Earthquake, Hellenic Subduction Zone
Next Article in Special Issue
Measurements of Rotational Events Generated by Artificial Explosions and External Excitations Using the Optical Fiber Sensors Network
Previous Article in Journal
Premature Atrial and Ventricular Contraction Detection Using Photoplethysmographic Data from a Smartwatch
Previous Article in Special Issue
Noise Analysis of a Passive Resonant Laser Gyroscope
Article

Comparative Measurements of Local Seismic Rotations by Three Independent Methods

1
Department of Geophysics, Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, 180 00 Prague, Czech Republic
2
Department of Seismotectonics, Institute of Rock Structure and Mechanics, Academy of Sciences of the Czech Republic, V Holešovičkách 41, 182 09 Prague, Czech Republic
*
Author to whom correspondence should be addressed.
Sensors 2020, 20(19), 5679; https://doi.org/10.3390/s20195679
Received: 3 August 2020 / Revised: 25 September 2020 / Accepted: 29 September 2020 / Published: 5 October 2020
(This article belongs to the Special Issue Rotation Rate Sensors and Their Applications)
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 104–105 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. View Full-Text
Keywords: seismic rotation; rotational seismometer; Rotaphone; seismic array seismic rotation; rotational seismometer; Rotaphone; seismic array
Show Figures

Figure 1

MDPI and ACS Style

Brokešová, J.; Málek, J. Comparative Measurements of Local Seismic Rotations by Three Independent Methods. Sensors 2020, 20, 5679. https://doi.org/10.3390/s20195679

AMA Style

Brokešová J, Málek J. Comparative Measurements of Local Seismic Rotations by Three Independent Methods. Sensors. 2020; 20(19):5679. https://doi.org/10.3390/s20195679

Chicago/Turabian Style

Brokešová, Johana, and Jiří Málek. 2020. "Comparative Measurements of Local Seismic Rotations by Three Independent Methods" Sensors 20, no. 19: 5679. https://doi.org/10.3390/s20195679

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop