Secular tidal and nontidal variations in the Earth's rotation

Burša, Milan; Pick, Miloš

doi:10.1007/bf01624753

Cited by 12 publications

(5 citation statements)

References 3 publications

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“…The torque exerted by tidal friction is relatively small 10 16 N m (Burša 1987) and considering the mantle viscosity 10 19 Pa s (Cathles 1975) only two orders of magnitude lower than the viscosity of lithosphere, this force is considered as insufficient for the plate movement. Today's mantle viscosity estimation following from the post glacial uplift, relative sea level changes and GRACE secular changes in gravity give relatively high values of upper mantle viscosity 5.3 × 10 20 Pa s (Paulson et al 2007), which do not witness about easy movement of plates in mantle.…”

Section: Calculation Of Forces Driving Platesmentioning

confidence: 99%

Tides as drivers of plates and criticism of mantle convection

Ostrihansky

2015

Acta Geod Geophys

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Forces moving plates are of two kinds: Force moving plates to the north and force moving plates to the west. They are both, by their origin, related to tidal forces but they act in quite different way. The northward force acts by its center in meridian, the westward force acts in direction of geographic parallels. Tidal forces of semidiurnal and diurnal periods cannot move plates because triggering of earthquakes by the stress of these amplitudes gives statistically insignificant results confirmed by many reports for more than 100 years. However the tidal forces acting on 10 km Earth's rotation bulges and the periodic Earth's deformations resulting in Earth's rotation variations give strong forces energetically equivalent to energy of large earthquakes. Oceanic lithosphere older than 180 M.Y. drops down to the mantle by gravity or is liquidated being overridden beneath continent. At that movement the released space facilitates the plate movement by tides. Hotspots firmly anchored in mantle show by tracks an exact movement of plates. Mantle convection is disregarded because it contradicts to existence of mid-ocean ridges triple junctions. Not Polfluchtkraft but Äquatorkraft force the tides create, which can move the large continent (for example Gondwana) far from equator as far as the pole, where after decay the Antarctica remains being out of tidal forces actions.

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Section: Calculation Of Forces Driving Platesmentioning

confidence: 99%

Tides as drivers of plates and criticism of mantle convection

Ostrihansky

2015

Acta Geod Geophys

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“…2. The torques of tidal friction were calculated by Burša (1987aBurša ( ), (1987b on the basis of angular momentum balance in the Earth -Moon -Sun system. Nm = 4.2 × 10 35 kg m 2 cy -2 = 4.2 ×10 16 kg m 2 s -2 = 4.2 × 10 16 Nm Ns = 8.9 × 10 34 kg m 2 cy -2 = 8.9 × 10 15 kg m 2 s -2 = 8.9 × 10 15 Nm…”

mentioning

confidence: 99%

“…The tidal fiction decelerates the Earth's rotation (Lambeck, 1977) and therefore it can be also considered as the force causing the westward movement of plates (Ostřihanský 2012a(Ostřihanský , 2012b. The torque exerted by the tidal friction is relative low 10 16 N m. (Burša 1987a) and considering the mantle viscosity only 2 orders of magnitude lower than the lithosphere (Cathles 1975), this force is considered as insufficient for the plate movement. But considering variable force (ad 1), acting on Earth's flattening, and tidal friction (ad 2) acting semidiurnally, then the westward movement is possible, owing to the north-south varying force ad 1, acting on it perpendicularly.…”

mentioning

confidence: 99%

Precursors of Pazarcik and Elbistan earthquakes 2023

Ostrihansky¹

2023

Preprint

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The paper explains origin of Pazarcik-Elbistan earthquake 2023 and seeks for precursors which could be helpful for earthquake prediction. Detailed tectonic study and correct direction of plates movement by tides revealed that the extreme quick Earth's rotation speed, after last 60 years, triggered this earthquake. Group of 5 low magnitude earthquakes before Pazarcik-Elbistan 2023 and 2 before Elazig 2020 earthquakes can be used as indicator preceding large earthquake. Maximum Moon and Sun declinations and coincidence with Full Moon indicated large tidal torques responsible for earthquake triggering. Nevertheless, there is following consequence: maximum Moon declination, Full or New Moon and then earthquake. Similar consequence has low magnitude precursors, occurring 2 or 3 days after ±minimum time deviation from 86400 s day standard.

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“…The torques of tidal friction were calculated by Burša (1987aBurša ( ), ( 1987b on the basis of angular momentum balance in the Earth -Moon -Sun system.…”

mentioning

confidence: 99%

“…The torque exerted by the tidal friction is relative low 10 16 N m. (Burša 1987a) and considering the mantle viscosity only 2 orders of magnitude lower than the lithosphere (Cathles 1975), this force is considered as insufficient for the plate movement. But considering variable force (ad 2), acting on Earth's flattening, and tidal friction (ad 3) acting semidiurnally, then the westward movement is possible, owing to the north-south varying force ad 2, acting on it perpendicularly.…”

mentioning

confidence: 99%

Tides as triggers of earthquakes in Hindu Kush II

Ostrihansky¹

2022

Preprint

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The intermediate-depth earthquakes (˜200 km) in Hindu Kush, Afghanistan were investigated to prove their origin by tides. An untraditional astronomical method has been used to prove how astronomical parameters influence triggering of earthquakes. In contrast to previous issues, where Moon hour angles were used, Moons declinations were used successfully to prove tidal origin of earthquakes. Maximum earthquakes have been recognized during minor lunar standstills, i.e.

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Secular tidal and nontidal variations in the Earth's rotation

Cited by 12 publications

References 3 publications

Tides as drivers of plates and criticism of mantle convection

Tides as drivers of plates and criticism of mantle convection

Precursors of Pazarcik and Elbistan earthquakes 2023

Tides as triggers of earthquakes in Hindu Kush II

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