DOI: 10.1016/j.earscirev.2020.103179
论文题名: Tidal modulation of plate motions
作者: Zaccagnino D. ; Vespe F. ; Doglioni C.
刊名: Earth Science Reviews
ISSN: 00128252
出版年: 2020
卷: 205 语种: 英语
中文关键词: Body tide horizontal component
; Driving forces
; Plate tectonics
英文关键词: accuracy assessment
; anisotropy
; GPS
; low velocity zone
; mantle convection
; plate motion
; plate tectonics
; satellite data
; satellite imagery
英文摘要: While mantle convection is a fundamental ingredient of geodynamics, the driving mechanism of plate tectonics remains elusive. Are plates driven only from the thermal cooling of the mantle or are there further astronomical forces acting on them? GPS measurements are now accurate enough that, on long baselines, both secular plate motions and periodic tidal displacements are visible. The now >20 year-long space geodesy record of plate motions allows a more accurate analysis of the contribution of the horizontal component of the body tide in shifting the lithosphere. We review the data and show that lithospheric plates retain a non-zero horizontal component of the solid Earth tidal waves and their speed correlates with tidal harmonics. High-frequency semidiurnal Earth's tides are likely contributing to plate motions, but their residuals are still within the error of the present accuracy of GNSS data. The low-frequency body tides rather show horizontal residuals equal to the relative motion among plates, proving the astronomical input on plate dynamics. Plates move faster with nutation cyclicities of 8.8 and 18.6 years that correlate to lunar apsides migration and nodal precession. The high-frequency body tides are mostly buffered by the high viscosity of the lithosphere and the underlying mantle, whereas low-frequency horizontal tidal oscillations are compatible with the relaxation time of the low-velocity zone and can westerly drag the lithosphere over the asthenospheric mantle. Variable angular velocities among plates are controlled by the viscosity anisotropies in the decoupling layer within the low-velocity zone. Tidal oscillations also correlate with the seismic release. © 2020 The Authors Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/166316
Appears in Collections: 气候变化与战略
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作者单位: Dipartimento di Fisica, Università Sapienza di Roma, Italy; Agenzia Spaziale Italiana, Matera, Italy; Dipartimento di Scienze della Terra, Università Sapienza di Roma, Italy; Istituto Nazionale di Geofisica e Vulcanologia, Roma, Italy
Recommended Citation:
Zaccagnino D.,Vespe F.,Doglioni C.. Tidal modulation of plate motions[J]. Earth Science Reviews,2020-01-01,205