scholarly journals Three-Dimensional Surface Displacement Field Associated with the 25 April 2015 Gorkha, Nepal, Earthquake: Solution from Integrated InSAR and GPS Measurements with an Extended SISTEM Approach

2016 ◽  
Vol 8 (7) ◽  
pp. 559 ◽  
Author(s):  
Haipeng Luo ◽  
Ting Chen
Keyword(s):  
Displacement Field ◽  
Three Dimensional ◽  
Surface Displacement ◽  
Gps Measurements ◽  
Nepal Earthquake ◽  
2015 Gorkha Nepal Earthquake ◽  
Dimensional Surface

Research on the method of three-dimensional surface displacements of Tianjin area based on combined multi-source measurements

2020 ◽  
Vol 14 (1) ◽  
pp. 83-94
Author(s):  
Nannan Guo ◽  
Wei Zhan
Keyword(s):  
Velocity Field ◽  
Spatial Resolution ◽  
Displacement Field ◽  
High Spatial Resolution ◽  
Weighted Least Squares ◽  
Three Dimensional ◽  
Large Displacement ◽  
Gps Measurements ◽  
Large Spatial Scale ◽  
Surface Time

AbstractCombining multi-source measurements can improve the accuracy and the spatial resolution of the three-dimensional (3-D) displacements field. Few researches have been conducted to integrate InSAR, GPS and leveling data of Tianjin in the recent three years to get the 3-D large displacement velocity field. How to effectively combine multi-source measurements and obtain the accurate 3-D large displacement field in high spatial resolution is worth studying. In this paper, the optimal method for acquiring 3-D displacement field by combining InSAR, leveling and GPS measurements is obtained by comparing the different methods. Then we realize the combining InSAR, leveling and GPS measurements to obtain the high-precision 3-D displacement field in Tianjin (China) from 2016 to 2018. Compared with different methods, we integrate InSAR, GPS and leveling measurements and use the weighted least squares method to estimate the 3-D displacement field with the highest accuracy. Although the accuracy of the horizontal displacement field obtained by this method has not been greatly improved, the vertical accuracy is obviously better than the other methods. The introduction of leveling measurements is beneficial to improve the accuracy of the vertical displacement field. Compared with independent GPS measurements, the standard deviations of 3-D displacements velocity field estimated by optimal solution method is 2.6 mm/yr, 2.1 mm/yr and 2.7 mm/yr in the vertical, eastern and northern directions, respectively. These results indicate that this method effectively utilizes the advantages of GPS, InSAR and leveling measurements, and extends the limitations of a single technical in describing surface-time scale applications. And the 3-D displacements information with a large spatial scale and high spatial resolution provides a reliable data basis for studying the crustal movement and its dynamic mechanism in China.

Rupture model of Mw 7.8 2015 Gorkha, Nepal earthquake: Constraints from GPS measurements of coseismic offsets

2017 ◽  
Vol 133 ◽  
pp. 56-61 ◽  
Author(s):  
Rajeev Kumar Yadav ◽  
P.N.S. Roy ◽  
Sandeep Kumar Gupta ◽  
P.K. Khan ◽  
J.K. Catherine ◽  
...  
Keyword(s):  
Gps Measurements ◽  
Nepal Earthquake ◽  
Rupture Model ◽  
2015 Gorkha Nepal Earthquake

Surface displacement field at Terceira island deduced from repeated GPS measurements

2012 ◽  
Vol 217-218 ◽  
pp. 1-7 ◽  
Author(s):  
J.M. Miranda ◽  
A. Navarro ◽  
J. Catalão ◽  
R.M.S. Fernandes
Keyword(s):  
Displacement Field ◽  
Surface Displacement ◽  
Gps Measurements

Enhancement of Heat Transfer Performance in Nuclear Fuel Rod Using Nanofluids and Surface Roughness Technique

2015 ◽  
Author(s):  
Kang Liu ◽  
Titan C. Paul ◽  
Leo A. Carrilho ◽  
Jamil A. Khan
Keyword(s):  
Heat Transfer ◽  
Surface Roughness ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Nuclear Fuel ◽  
Three Dimensional ◽  
Pressurized Water ◽  
Bulk Fluid ◽  
Fuel Rod ◽  
Dimensional Surface

The experimental investigations were carried out of a pressurized water nuclear reactor (PWR) with enhanced surface using different concentration (0.5 and 2.0 vol%) of ZnO/DI-water based nanofluids as a coolant. The experimental setup consisted of a flow loop with a nuclear fuel rod section that was heated by electrical current. The fuel rod surfaces were termed as two-dimensional surface roughness (square transverse ribbed surface) and three-dimensional surface roughness (diamond shaped blocks). The variation in temperature of nuclear fuel rod was measured along the length of a specified section. Heat transfer coefficient was calculated by measuring heat flux and temperature differences between surface and bulk fluid. The experimental results of nanofluids were compared with the coolant as a DI-water data. The maximum heat transfer coefficient enhancement was achieved 33% at Re = 1.15 × 105 for fuel rod with three-dimensional surface roughness using 2.0 vol% nanofluids compared to DI-water.

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