气候变化领域集成服务门户(CCPortal): Tidal modulation of plate motions

CCPortal

DOI	10.1016/j.earscirev.2020.103179
	Tidal modulation of plate motions
	Zaccagnino D.; Vespe F.; Doglioni C.
发表日期	2020
ISSN	0012-8691
卷号	205
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
英文关键词	Body tide horizontal component; Driving forces; Plate tectonics
语种	英语
scopus关键词	accuracy assessment; anisotropy; GPS; low velocity zone; mantle convection; plate motion; plate tectonics; satellite data; satellite imagery
来源期刊	EARTH-SCIENCE REVIEWS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/209620
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
推荐引用方式 GB/T 7714	Zaccagnino D.,Vespe F.,Doglioni C.. Tidal modulation of plate motions[J],2020,205.
APA	Zaccagnino D.,Vespe F.,&Doglioni C..(2020).Tidal modulation of plate motions.EARTH-SCIENCE REVIEWS,205.
MLA	Zaccagnino D.,et al."Tidal modulation of plate motions".EARTH-SCIENCE REVIEWS 205(2020).