Results 11 to 20 of about 89,813 (296)
Seismic excitation of the polar motion, 1977–1993 [PDF]
pure and applied geophysics, 1996 The mass redistribution in the earth as a result of an earthquake faulting changes the earth’s inertia tensor, and hence its rotation. Using the complete formulae developed by CHao and GRoss (1987) based on the normal mode theory, we calculated the earthquake-induced polar motion excitation for the largest 11,015 earthquakes that occurred during 1977.0–
Benjamin Fong Chao +2 more
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Coseismic Excitation of the Earth’s Polar Motion [PDF]
International Astronomical Union Colloquium, 2000 AbstractApart from the “shaking” near the epicenter that is the earthquake, a seismic event creates a permanent field of dislocation in the entire Earth. This redistribution of mass changes (slightly) the Earth’s inertia tensor; and the Earth’s rotation will change in accordance with the conservation of angular momentum.
B.F. Chao, R.S. Gross
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Excitation of Polar Motion [PDF]
International Astronomical Union Colloquium, 2000 AbstractConceptual models of polar motion have evolved over the past century, as improved data revealed signals over progressively wider frequency bands. In the 1890s, Chandler represented polar motion as a sum of discrete components, 14 month and annual terms, and this component model effectively summarized the observations, but did not provide a ...
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The atmospheric excitation of rapid polar motions [PDF]
Symposium - International Astronomical Union, 1988 Analysis of data from new, highly accurate, geodetic techniques reveals rapid polar motions. Comparison of the new geodetic data and meteorological excitation estimates shows that the observed rapid polar motions are correlated with atmospheric pressure changes, and that these changes are related to atmospheric normal modes.
T. M. Eubanks +2 more
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Validation of GRACE and GRACE-FO Mascon Data for the Study of Polar Motion Excitation
Remote Sensing, 2021 In this study, we calculate the hydrological plus cryospheric excitation of polar motion (hydrological plus cryospheric angular momentum, HAM/CAM) using mascon solutions based on observations from the Gravity Recovery and Climate Experiment (GRACE) and ...
Justyna Śliwińska +2 more
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Atmospheric excitation of polar motion
Geo-spatial Information Science, 2010 The polar motion excited by the fluctuation of global atmospheric angular momentum (AAM) is investigated. Based on the global AAM data, numerical results demonstrate that the fluctuation of AAM can excite the seasonal wobbles (e.g., the 18-month wobble) and the Chandler wobble, which agree well with previous studies.
Wei Chen, Wenbin Shen, Xiaowei Dong
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Seasonal excitation of polar motion
Journal of Geodynamics, 2012 We estimate geophysical excitations (chi(1) and chi(2)) of polar motion using multiple sources of data, including recent atmospheric, oceanic, and hydrological models, satellite gravity measurements from the Gravity Recovery and Climate Experiment (GRACE), and compare geophysical excitations with observed polar motion excitations from space geodetic ...
Chen, J., Wilson, C., Zhou, Y.
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Hydrological excitations of polar motion, 1993-2002 [PDF]
Geophysical Journal International, 2005 SUMMARY Changes in continental water storage obtained from an advanced land data assimilation system (LDAS) are employed to compute hydrological excitations of polar motion for the 10-yr period of 1993‐2002. The results are compared with observed excitations of polar motion and contributions from the atmosphere and ocean, and with results from previous
J. L. Chen, C. R. Wilson
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Research on Earth rotation and geodynamics in Poland in 2015–2018 [PDF]
Geodesy and Cartography, 2019 This paper summarizes the activity of the chosen Polish geodetic research teams in 2015–2018 in the fields of Earth: rotation, dynamics as well as magnetic field.
Janusz Bogusz +2 more
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Earth, Planets and Space, 2021 In geodesy, a key application of data from the Gravity Recovery and Climate Experiment (GRACE), GRACE Follow-On (GRACE-FO), and Satellite Laser Ranging (SLR) is an interpretation of changes in polar motion excitation due to variations in the Earth’s ...
Justyna Śliwińska +2 more
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