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Part of book or chapter of book . 2012 . Peer-reviewed
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Fibre-Optic Sagnac Interferometer as Seismograph for Direct Monitoring of Rotational Events

Authors: Leszek R.; Zbigniew Krajewski; Krzysztof P.;

Fibre-Optic Sagnac Interferometer as Seismograph for Direct Monitoring of Rotational Events

Abstract

The possibility of a direct monitoring of rotational events has an important role in the seismological sciences as well as in the applied physics regarding large engineering structures. According to the first aspect, a possibility of existence of the rotational phenomena in the seismic field has been discussed from the beginning of the earthquakes investigations. The interest in these phenomena has been stimulated by strange, rotary and even screw-like deformations that occur after earthquakes, often appearing on parts of tombs and monuments (Ferrari, 2006; Kozak 2006). The classical textbooks on seismology deny the possibility that the rotational phenomena, especially in form of seismic rotational waves – SRW, could pass through a rock, so the earthquake rotational phenomena were explained by an interaction of standard seismic waves with a compound structure of objects they penetrate, which, in fact, might be the case (Teisseyre & Kozak, 2003). Nevertheless, it was theoretically proved that even the SRW could propagate through grained rocks; later on, this possibility was extended on rocks with microstructure or defects (Eringen, 1999; Teisseyre & Boratynski, 2002) or even without any internal structure (Teisseyre, 2005; Teisseyre et al., 2005; Teisseyre & Gorski, 2009), due to the asymmetric stresses in the medium. It should be noticed that the SRW were for the first time effectively recorded in Poland in 1976 (Droste & Teisseyre, 1976). From this time, waves of this type have been studied in a few centers over the world. Taking into consideration large engineering structures, the rotational events monitoring is connected to the torsional effects in structures as well as to the interstory drift. Since the application of new materials and technologies for building constructions, they have irregular structures in-plane which causes difficulties in designing of the horizontal rotations of these structures especially during earthquakes (Schreiber et al., 2009). Recently in the above areas, the first monographs have been published (Teisseyre et al., 2006, 2008; Lee et al., 2009), covering the theoretical aspects of the rotation motion generation and propagation, as well as the examples of the field experiments. A further experimental verification of the existing rotational phenomena in seismic events needs a new approach to the construction of the measuring devices, because the

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
1
Average
Average
Average
hybrid