Results 61 to 70 of about 61,254 (215)
Revisiting the Excitation of Free Core Nutation
Journal of Geophysical Research: Solid Earth, Volume 129, Issue 9, September 2024.Abstract Earth possesses a Poincaré mode called Free Core Nutation (FCN) due to the misalignment of the rotation axes of the mantle and fluid outer core. FCN is the primary signal in the observations of Celestial Pole Offsets (CPO) and maintained by geophysical mechanisms that are yet to be understood. Earlier studies suggested an origin in Atmospheric
Mostafa Kiani Shahvandi +4 more
wiley +1 more source
“Escargot Effect” and the Chandler Wobble Excitation
, 2018 We study the Chandler wobble (CW) of the pole from 1846 to 2017 extracted by the Panteleev filtering. The CW has period of 433 days, average amplitude of 0.13 milliarcseconds (mas) which is changing, and phase jump by ϕ in 1930-th.
L. Zotov, C. Bizouard
semanticscholar +1 more source
The Period of the Chandler Wobble [PDF]
Symposium - International Astronomical Union, 1980 Realistic models of the Earth are known to possess a solid anelastic inner core, mantle and crust, and a fluid core and oceans. How might we go about calculating the theoretical free period of the Chandler wobble of such an Earth model? Let xi be a set of Cartesian axes with an origin at the center of mass, and let ωi be the instantaneous angular ...
openaire +1 more source
Dissipation and Ellipticity of the Chandler Wobble [PDF]
International Astronomical Union Colloquium, 2000 AbstractThe Chandler wobble, one of the main feature of the Earth’s polar motion, is related to the properties of the mantle and liquid core as well as the mobility of the oceans. The equilibrium pole tide and mantle anelasticity both lengthen the Chandler period, moreover, the former imposes a slight ellipticity on the pole path, and the latter is ...
Yaozhong Zhu, Buxi Gao
openaire +1 more source
Seismic excitation of the Chandler wobble revisited [PDF]
Geophysical Journal International, 1979 Summary. An overview is taken of the last decade of studies of the effect of earthquakes on the polar motion. The treatment of the liquid outer core in static deformation is reviewed and some misconceptions in a number of papers are pointed out. Volterra’s formula is generalized to the case of a liquid core which does not obey the highly idealized ...
L. Mansinha, D. E. Smylie, C. H. Chapman
openaire +1 more source
Journal of Geophysical Research: Planets, Volume 129, Issue 6, June 2024.Abstract The mass transport of volatiles on Mars represents a seasonally changing load on the surface of the planet. Like on Earth, as mass is redistributed across the planet, the surface responds in a complex manner becoming displaced downwards or upwards.
N. L. Wagner +3 more
wiley +1 more source
On the nonlinear and Solar-forced nature of the Chandler wobble in the Earth's pole motion
, 2019 . About 250 years ago L. Euler has derived a system of three quadratic-nonlinear differential equations to depict the rotation of the Earth as a rigid body.
D. Sonechkin
semanticscholar +1 more source
Medical Anthropology Quarterly, Volume 38, Issue 2, Page 149-163, June 2024.Abstract The COVID‐19 pandemic prompted critical attention to the performative power of metrics. We suggest that the existential capacities of metrics as a means of pandemic living warrant further consideration. We describe how the COVID‐19 pandemic that came into existence as a public health and political event could only have occurred because of the ...
Vincanne Adams +3 more
wiley +1 more source
Journal of Geophysical Research: Solid Earth, Volume 129, Issue 5, May 2024.Abstract In a previous study (Okamoto & Hiraga, 2022, https://doi.org/10.1029/2022jb024638), we concluded that diffusion creep and grain growth in polymineralic rocks proceed by a common diffusional mechanism. Here, we built on that finding and estimated lower mantle grain size and viscosity during a single mantle convection cycle dominated by ...
A. Okamoto, T. Hiraga
wiley +1 more source
Earthquake source mechanisms and plate tectonics [PDF]
, 1979 This review and the accompanying references will be concerned mainly with earthquake source studies pertinent to plate tectonics. Studies on geological problems, lithospheric flexure and mantle convection are discussed in other reviews in this volume.
Kanamori, Hiroo
core +1 more source