Remains of the Iwasa checkpoint on the Noneyama-kaido as an ancient road located in ridge-top area formed by gravitational deformation, the Muroto Peninsula, Japan

2020 ◽  
Vol 57 (1) ◽  
pp. 19-23
Author(s):  
Go SATO ◽  
Hiroshi YAGI ◽  
Hitoshi KITANI ◽  
Yoshimichi SENDA ◽  
Kiyoharu HIROTA
Keyword(s):  
Gravitational Deformation

High-resolution geological model of the gravitational deformation affecting the western slope of Mt. Epomeo (Ischia)

2015 ◽  
Vol 35 ◽  
pp. 104-108
Author(s):  
Marta Della Seta ◽  
Carlo Esposito ◽  
Gian Marco Marmoni ◽  
Salvatore Martino ◽  
Antonella Paciello ◽  
...  
Keyword(s):  
High Resolution ◽  
Western Slope ◽  
Geological Model ◽  
Gravitational Deformation

Correcting Gravitational Deformation at the Tianma Radio Telescope

2018 ◽  
Vol 66 (4) ◽  
pp. 2044-2048 ◽  
Author(s):  
Jian Dong ◽  
Weiye Zhong ◽  
Jinqing Wang ◽  
Qinghui Liu ◽  
Zhiqiang Shen
Keyword(s):  
Radio Telescope ◽  
Gravitational Deformation

Gravitational Deformation in Shaping Asteroids and Small Satellites

Icarus ◽  
1997 ◽  
Vol 129 (2) ◽  
pp. 401-414 ◽  
Author(s):  
Evgeniy N. Slyuta ◽  
Sergey A. Voropaev
Keyword(s):  
Small Satellites ◽  
Gravitational Deformation

scholarly journals Gravitational deformation of ring-focus antennas for VGOS: first investigations at the Onsala twin telescopes project

2019 ◽  
Vol 93 (10) ◽  
pp. 2069-2087 ◽  
Author(s):  
Michael Lösler ◽  
Rüdiger Haas ◽  
Cornelia Eschelbach ◽  
Ansgar Greiwe
Keyword(s):  
Path Length ◽  
Deformation Pattern ◽  
Radio Telescopes ◽  
Close Range Photogrammetry ◽  
Geodetic Vlbi ◽  
Gravitational Deformation ◽  
Close Range ◽  
Main Reflector ◽  
Ray Path ◽  
First Time

Abstract The receiving properties of radio telescopes used in geodetic and astrometric very long baseline interferometry (VLBI) depend on the surface quality and stability of the main reflector. Deformations of the main reflector as well as changes in the sub-reflector position affect the geometrical ray path length significantly. The deformation pattern and its impact on the VLBI results of conventional radio telescopes have been studied by several research groups using holography, laser tracker, close-range photogrammetry and laser scanner methods. Signal path variations (SPV) of up to 1 cm were reported, which cause, when unaccounted for, systematic biases of the estimated vertical positions of the radio telescopes in the geodetic VLBI analysis and potentially even affect the estimated scale of derived global geodetic reference frames. As a result of the realization of the VLBI 2010 agenda, the geodetic VLBI network is currently extended by several new radio telescopes, which are of a more compact and stiffer design and are able to move faster than conventional radio telescopes. These new telescopes will form the backbone of the next generation geodetic VLBI system, often referred to as VGOS (VLBI Global Observing System). In this investigation, for the first time the deformation pattern of this new generation of radio telescopes for VGOS is studied. ONSA13NE, one of the Onsala twin telescopes at the Onsala Space Observatory, was observed in several elevation angles using close-range photogrammetry. In general, these methods require a crane for preparing the reflector as well as for the data collection. To reduce the observation time and the technical effort during the measurement process, an unmanned aircraft system (UAS) was used for the first time. Using this system, the measurement campaign per elevation angle took less than 30 min. The collected data were used to model the geometrical ray path and its variations. Depending on the distance from the optical axis, the ray path length varies in a range of about $$\pm \,1\,\hbox {mm}$$±1mm. To combine the ray path variations, an illumination function was introduced as weighting function. The resulting total SPV is about $$- \,0.5$$-0.5 mm. A simple elevation-dependent SPV model is presented that can easily be used and implemented in VLBI data analysis software packages to correct for gravitational deformation in VGOS radio telescopes. The uncertainty is almost $$200\,\upmu \hbox {m}$$200μm ($$2\sigma $$2σ) and is derived by Monte Carlo simulations applied to the entire analysis process.

scholarly journals 3D imaging of volcano gravitational deformation by computerized X-ray micro-tomography

Geosphere ◽  
2010 ◽  
Vol 6 (5) ◽  
pp. 482-498 ◽  
Author(s):  
M. Kervyn ◽  
M.N. Boone ◽  
B. van Wyk de Vries ◽  
E. Lebas ◽  
V. Cnudde ◽  
...  
Keyword(s):  
3D Imaging ◽  
X Ray ◽  
Gravitational Deformation ◽  
Micro Tomography

scholarly journals Gravitational deformation and inherited structural control on slope morphology in the subduction zone of north-central Chile (ca. 29-33°S)

2016 ◽  
Vol 29 (6) ◽  
pp. 798-815 ◽  
Author(s):  
Juan Becerra ◽  
César Arriagada ◽  
Eduardo Contreras-Reyes ◽  
Sebastián Bascuñan ◽  
Gregory P. De Pascale ◽  
...  
Keyword(s):  
Subduction Zone ◽  
Structural Control ◽  
North Central ◽  
Central Chile ◽  
Gravitational Deformation
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