Thermo-elastic deformations due to the annual temperature variation at the tidal station in Vyhne

Hvoždara, M.; Brimich, Ladislav; Skalský, Lumír

doi:10.1007/bf01637575

Cited by 9 publications

(11 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Table 1 also includes two special parameters, namely the "shifted" temperature and the value of displacement amplitudes of microseisms expressed in the logarithmic scale. The "shifted" temperature expresses the temperature, which was on the surface 5 -6 months ago due to delay in the spreading of thermoelastic waves as explained by Hvoždara et al (1988). Considering that microseism amplitudes demonstrably do not present any linear response to external effects as documented in Table 1 and Fig.…”

Section: Analysis Of the Interaction Between Meteorological Conditionmentioning

confidence: 99%

“…According to our measurement of microseisms (Holub et al 2008(Holub et al , 2009) and massif deformations (Kalenda and Neumann 2010;Kalenda et al 2009), we deduced that there are at least three other mechanisms capable of microseism generation in addition to the widely accepted mechanism of generation by ocean waves. The first mechanism can be connected with atmospheric pressure variations; the second is associated with thermoelastic waves in rock mass (Hvoždara and Brimich 1988;Brimich 2006); and, third the relationship is associated with large earthquakes (Kalenda et al 2011(Kalenda et al , 2013. All of the proposed mechanisms are coupled with stress/pressure variations during the year and not with the water shoaling.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Mutual Coupling Between Meteorological Parameters and Secondary Microseisms

Holub¹,

Kalenda²,

Rušajová³

2013

Terr. Atmos. Ocean. Sci.

View full text Add to dashboard Cite

The basic scientific question of this study was: do other mechanisms exist for excitation of secondary microseisms aside from the widely accepted mechanism by non-linear interactions of respective ocean waves. Here we use continuous broadband data from secondary microseisms recorded at the Ostrava-Krásné Pole, Czech Republic (OKC) seismic station to create a massive seismological database. Except for seismological data, various meteorological features and their mutual relations were analysed: temperature, the so called "shifted" temperature, air density, changes of atmospheric pressure, and synoptic situations. These analyses prove that maximum amplitudes of microseisms were observed during winter, while minimum amplitudes occured in summer months. The annual variations of microseisms amplitudes could not be explained by annual variations of storm activity above the North Atlantic. In addition, current analyses also aim at quantitative and quantitative evaluation of synoptic situations for triggering individual microseismic anomalies. Some of the meteorological features, namely the distribution of low pressures above northern Europe and high-pressure areas in Central Europe make it easy to explain most of the microseismic extremes. Here we pay special attention to the influence of large earthquakes, which usually induce slow deformation waves. We conclude that at least three mechanisms of microseism generation are possible: (1) the function of atmospheric pressure at sea level in the North Atlantic, (2) the effects of spreading of thermoelastic waves in the rock mass and (3) deformation waves induced by large earthquakes.

show abstract

Section: Analysis Of the Interaction Between Meteorological Conditionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mutual Coupling Between Meteorological Parameters and Secondary Microseisms

Holub¹,

Kalenda²,

Rušajová³

2013

Terr. Atmos. Ocean. Sci.

View full text Add to dashboard Cite

show abstract

“…Such quick changes can´t be explained by the penetration of the thermal wave into the depth of the concrete, which is very slow (the thermal wave can penetrate to the depth of 0.15 m during half a day [5], but it must be explained by a different mechanism. This mechanism was probably described by Hvožďara et al [6] using data from the strainmeter at Vyhne (Slovakia) as the excitation of the thermoelastic wave. In this case the only near-surface portion of the material is heated and expanded and only this thin layer of material deforms elastically its surroundings.…”

Section: Discussionmentioning

confidence: 93%

The Tilt of the Elevator Shaft of Bunker Skutina

Kalenda¹,

Neumann²

2014

TransVSBms

View full text Add to dashboard Cite

The measurement of deformations of the elevator shaft in the Skutina fortress between the 2nd floor and the depth of 33 m below the surface took place in 2009. These measurements showed that, in addition to the tides, the diurnal thermoelastic wave deforms the body of the bunker, particularly in the NS direction. The amplitude of this deformation depends mainly on the cloudiness (opposite to the irradiance). Morning and evening deformation curves depend mainly on the time of sunrise and the geometry of the body of the bunker (irradiance of the bunker walls) and less of the outside temperature. AbstraktV roce 2009 probíhalo v bunkru Skutina měření deformace výtahové šachty od druhého nadzemního podlaží bunkru do hloubky cca 33 m pod povrch. Tato měření ukázala, že kromě slapů se na deformaci tělesa bunkru podílí celodenní termoelastická vlna, zejména ve směru S-J. Amplituda této deformace závisí zejména na oblačnosti (protiklad osvitu). Ranní a večerní obraty deformační křivky jsou závislé zejména na době východu Slunce a na geometrii tělesa bunkru (osvitu stěn bunkru) a méně na venkovní teplotě.

show abstract

“…5 The Chinese team 1 used a high-accuracy LaCoste-Romberg gravimeter, with overall precision of 2-3 lGal. Observations were automatically recorded every minute during seven days (5)(6)(7)(8)(9)(10)(11)(12), thus providing a reliable background for the identification of perturbations of local gravity.…”

Section: Solar Eclipses and Two-valley Curvesmentioning

confidence: 99%

“…Duif also discussed periodic gravity anomalies under noneclipse conditions and found that conventional explanations are not sufficient, with the possible exception of a differential heating of the laboratory roof due to asymmetric cloud cover. 6 Other possible explanations of the observed anomalies during eclipses are based on thermoelastic deformations of earth's surface 7 and in the scattering of solar wind or some other particles coming from the sun. 8 Such explanations, however, are not applicable to Majorana's laboratory experiments, to which we turn our attention now.…”

Section: Introductionmentioning

confidence: 98%

Gravity attenuation and consistency with observed solar eclipse gravitational anomalies

Múnera¹

2011

Physics Essays

View full text Add to dashboard Cite

During the solar eclipse of March 9, 1997, a Chinese group carried out an experiment specifically designed to detect possible gravity variations. They identified two significant anomalous lateral valleys, interpreted by them as a possible shielding effect of the Moon on the gravitational force of the Sun. This interpretation was criticized because only one central valley centered at maximum eclipse is conventionally expected. In April of 1918, Quirino Majorana started his work on gravity absorption at the Polytechnic Institute of Turin (Italy); experimentally he found that the value of his universal gravity quenching coefficient was h % 10 À12 cm 2 =g. In 1922, Majorana moved to the University of Bologna where he repeated the experiments obtaining h-values of the same order of magnitude. Estimates for h from the shielding of solar gravity by the Moon during solar eclipses typically are 2-3 orders of magnitude smaller, down to h % 10 À21 cm 2 =g from fluctuations of Moon's orbit. Then, some theoreticians discount the higher empirical laboratory values as being wrong. By analogy with photon attenuation in matter, an extension of Majorana's hypothesis is proposed here, where h represents both absorption and scattering, and becomes a variable parameter, dependent on the baryonic mix (Z, N) of the substance interacting with gravity. When attenuation is dominated by scattering, the residual gravity curve may exhibit two lateral valleys, as effectively observed in at least six solar eclipses from 1954 to 1999, described in the text. Therefore, gravity attenuation during solar eclipses is dominated by scattering instead of absorption as conventionally believed.Résumé: Au cours de l'éclipse solaire du 9 mars, 1997, un groupe chinois a réalisé une expérience spécifiquement conçu pour détecter de possibles variations de la gravité. Ils ont identifié deux importantes anomalies en forme de vallées latérales, interprétées par eux comme possiblement reliées à un effet d'écran de la Lune sur la force gravitationnelle du Soleil. Cette interprétation a été critiquée car une seule vallée centrée au maximum de l'éclipse est normalement prévue. La possibilité d'une absorption de la gravité, suggérée en 1920 par Quirino Majorana en Italie, est définie par le coefficient universel h % 10 À12 cm 2 =g qu'il a déterminé à partir de mesures en laboratoire. Les évaluations de h pour l'effet d'écran de la Lune sur l'attraction solaire pendant les éclipses solaires sont généralement inférieures de 2 à 3 ordres de grandeur, et même jusqu'à h % 10 À21 cm 2 =g en se basant sur les fluctuations de l'orbite de la Lune. Certains théoriciens considèrent alors que ces valeurs empiriques élevées sont fausses. Par analogie avec l'atténuation des photons par la matière, une extension de l'hypothèse de Majorana est proposé ici, où h représente à la fois l'absorption et la dispersion, et devient un paramètre variable qui dépend du mélange baryonique (Z, N) de la substance interagissant avec gravité. Lorsque l'atténuation est dominée par la dispersion et l...

show abstract

Thermo-elastic deformations due to the annual temperature variation at the tidal station in Vyhne

Cited by 9 publications

References 0 publications

Mutual Coupling Between Meteorological Parameters and Secondary Microseisms

Mutual Coupling Between Meteorological Parameters and Secondary Microseisms

The Tilt of the Elevator Shaft of Bunker Skutina

Gravity attenuation and consistency with observed solar eclipse gravitational anomalies

Contact Info

Product

Resources

About