Rotaphone-CY: The Newest Rotaphone Model Design and Preliminary Results from Performance Tests with Active Seismic Sources

Brokešová, Johana; Málek, Jiří; Vackář, Jiří; Bernauer, Felix; Wassermann, Joachim; Igel, Heiner

doi:10.3390/s21020562

Cited by 8 publications

(3 citation statements)

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“…Further, the recognition of rotations as an additional observable in seismology (W. H. K. Lee, 2009;Zembaty, 2009) is expected to result in significantly more recorded data in the near future. Recently many studies (Bernauer et al, 2020;Brokešová et al, 2021;Chiu et al, 2013;Igel et al, 2005Igel et al, , 2021 have reported the surface rotations measured due to earthquakes using improved instrumentation technology.…”

Section: Plain Language Summarymentioning

confidence: 99%

Seismic Wave Propagation Through Layered Reduced Micropolar Medium

2021

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The ground motions recorded in the near‐field regions of earthquakes reveal that, along with translational motions the rotational motions can severely damage structures. To capture these ground rotations more realistically, the present study makes a novel attempt to model the Earth medium as a horizontally layered reduced micropolar half‐space. Layers in this medium are characterized by five material constants: Lame's constant (λ), Eringen's shear modulus (μ), density (ρ), rotational moment of inertia (j), and an additional material constant (κ). Cylindrical coordinate system is used to analytically derive the Green's functions and obtain the response of the layered Earth medium subjected to a point earthquake force. The analytically obtained surface translations and rotations involve integrations over the wavenumber and frequency parameters and hence, are evaluated numerically. These solutions converge to corresponding classical elastic medium when the micropolar medium parameters obey the relations κ≪μ and 2κρj≫ω2, where ω is the maximum frequency considered in the simulation. Thereafter, ground motions are simulated for several combinations of earthquake magnitudes and epicenter distances by modeling the Earth medium as an eight layered reduced micropolar half‐space. Further, ground motions for the 2012 Wutai earthquake were simulated using the proposed model and compared with the response of classical elastic medium. The comparisons indicate that the surface rotations are significantly higher in the case of reduced micropolar medium. The proposed formulation can be extended to simulate ground motions for finite‐fault seismic sources.

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Section: Plain Language Summarymentioning

confidence: 99%

Seismic Wave Propagation Through Layered Reduced Micropolar Medium

2021

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“…The first published results cannot be regarded as a fully satisfactory comparison of data from different sensors, as it can be concluded from the fundamental Bernauer et al paper [14]. However, the separate data from different kind of rotational devices, including Rothaphone-CY [15] or FOS5 [16], show a "light at the end of the tunnel" regarding future harmonization of data collected by such devices.…”

Section: Introductionmentioning

confidence: 99%

Opto-Electronics Review

Kurzych,

Jaroszewicz,

Dudek

et al. 2020

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Rotational seismology is one of the fastest developing fields of science nowadays with strongly recognized significance. Capability of monitoring rotational ground motions represents a crucial aspect of improving civil safety and efficiency of seismological data gathering. The correct sensing network selection is very important for reliable data acquisition. This paper presents initial data obtained during the international research study which has involved more than 40 various rotational sensors collected in one place. The key novelty of this experiment was the possibility to compare data gathered by completely different rotational sensors during artificially generated ground vibrations. Authors collected data by four interferometric optical fiber sensors, Fiber-Optic System for Rotational Events & Phenomena Monitoring (FOSREM), which are mobile rotational seismographs with a wide measuring range from 10 -7 rad/s up to even few rad/s, sensitive only to the rotational component of the ground movement. Presented experimental results show that FOSREMs are competitive in rotational events recording compared with the state-of-the-art rotational sensors but their operation still should be improved.

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“…Bernauer et al [ 10 ] describe a field experiment, which took place in Fürstenfeldbruck in November 2019, that was devoted to the comparison of 24 rotation rate sensors under artificially induced seismic excitations. The other three papers are devoted to more detailed field tests of particular devices during the Fürstenfeldbruck experiment: Kurzych et al [ 11 ], Izgi et al [ 12 ], and Brokešová et al [ 13 ]. The paper by Cao et al [ 5 ] focuses on the performance characteristics of specific seismic rotational motion sensors.…”

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confidence: 99%