Estimates of ocean tide loading displacements and its impact on position time series in Hong Kong using a dense continuous GPS network

2009 ◽  
Vol 83 (11) ◽  
pp. 999-1015 ◽  
Author(s):  
L. G. Yuan ◽  
X. L. Ding ◽  
P. Zhong ◽  
W. Chen ◽  
D. F. Huang
Keyword(s):  
Time Series ◽  
Hong Kong ◽  
Ocean Tide ◽  
Ocean Tide Loading ◽  
Gps Network ◽  
Position Time Series ◽  
Continuous Gps

scholarly journals Estimates of Minor Ocean Tide Loading Displacement and Its Impact on Continuous GPS Coordinate Time Series

Sensors ◽  
2014 ◽  
Vol 14 (3) ◽  
pp. 5552-5572 ◽  
Author(s):  
Zhao Li ◽  
Weiping Jiang ◽  
Wenwu Ding ◽  
Liansheng Deng ◽  
Lifeng Peng
Keyword(s):  
Time Series ◽  
Ocean Tide ◽  
Coordinate Time ◽  
Ocean Tide Loading ◽  
Coordinate Time Series ◽  
Continuous Gps ◽  
Gps Coordinate Time Series

scholarly journals GPS measurements on pre-, co- and post-seismic surface deformation at first multi-parametric geophysical observatory, Ghuttu in Garhwal Himalaya, India

2020 ◽  
Vol 10 (1) ◽  
pp. 136-144
Author(s):  
P.K. Gautam ◽  
S. Rajesh ◽  
N. Kumar ◽  
C.P. Dabral
Keyword(s):  
Time Series ◽  
Surface Deformation ◽  
Translational Motion ◽  
Anomalous Behavior ◽  
Deformation Pattern ◽  
Local Earthquakes ◽  
Position Time Series ◽  
Continuous Gps ◽  
Gps Time Series ◽  
Gps Station

Abstract We investigate the surface deformation pattern of GPS station at MPGO Ghuttu (GHUT) to find out the cause of anomalous behavior in the continuous GPS time series. Seven years (2007-2013) of GPS data has been analyzed using GAMIT/GLOBK software and generated the daily position time series. The horizontal translational motion at GHUT is 43.7 ± 1 mm/yr at an angle of 41°± 3° towards NE, while for the IGS station at LHAZ, the motion is 49.4 ±1 mm/yr at 18 ± 2.5° towards NEE. The estimated velocity at GHUT station with respect to IISC is 12 ± 1 mm/yr towards SW. Besides, we have also examined anomalous changes in the time series of GHUT before, after and during the occurrences of local earthquakes by considering the empirical strain radius; such that, a possible relationship between the strain radius and the occurrences of earthquakes have been explored. We considered seven local earthquakes on the basis of Dobrovolsky strain radius condition having magnitude from 4.5 to 5.7, which occurred from 2007 to 2011. Results show irrespective of the station strain radius, pre-seismic surface deformational anomalies are observed roughly 70 to 80 days before the occurrence of a Moderate or higher magnitude events. This has been observed for the cases of those events originated from the Uttarakashi and the Chamoli seismic zones in the Garhwal and Kumaun Himalaya. Occurrences of short (< 100 days) and long (two years) inter-seismic events in the Garhwal region plausibly regulating and diffusing the regional strain accumulation.

scholarly journals Precision of continuous GPS velocities from statistical analysis of synthetic time series

2018 ◽  
Author(s):  
Christine Masson ◽  
Stephane Mazzotti ◽  
Philippe Vernant
Keyword(s):  
Time Series ◽  
Extreme Values ◽  
Regression Tree ◽  
Simple Method ◽  
Position Time Series ◽  
Gps Velocities ◽  
Synthetic Time Series ◽  
Continuous Gps ◽  
Automatic Treatment ◽  
Gps Noise

Abstract. We use statistical analyses of synthetic position time series to estimate the potential precision of GPS velocities. The synthetic series represent the standard range of noise, seasonal, and position offset characteristics, leaving aside extreme values. This analysis is combined with a new simple method for automatic offset detection that allows an automatic treatment of the massive dataset. Colored noise and the presence of offsets are the primary contributor to velocity variability. However, regression tree analyses show that the main factors controlling the velocity precision are first the duration of the series, followed by the presence of offsets and the noise (dispersion and spectral index). Our analysis allows us to propose guidelines, which can be applied to actual GPS data, that constrain the velocity accuracies (expressed as 95 % confidence limits) based on simple parameters: (1) Series durations over 8.0 years result in high velocity accuracies in the horizontal (0.2 mm yr−1) and vertical (0.5 mm yr−1); (2) Series durations of less than 4.5 years cannot be used for high-precision studies since the horizontal accuracy is insufficient (over 1.0 mm yr−1); (3) Series of intermediate durations (4.5–8.0 years) are associated with an intermediate horizontal accuracy (0.6 mm yr-1) and a poor vertical one (1.3 mm yr−1), unless they comprise no offset. Our results suggest that very long series durations (over 15–20 years) do not ensure a better accuracy compare to series of 8–10 years, due to the noise amplitude following a power-law dependency on the frequency. Thus, better characterizations of long-period GPS noise and pluri-annual environmental loads are critical to further improve GPS velocity precisions.

Determination of ocean tide loading displacements in Hong Kong using GPS technique

2010 ◽  
Vol 53 (7) ◽  
pp. 993-1007 ◽  
Author(s):  
LinGuo Yuan ◽  
XiaoLi Ding ◽  
HePing Sun ◽  
Ping Zhong ◽  
Wu Chen
Keyword(s):  
Hong Kong ◽  
Ocean Tide ◽  
Ocean Tide Loading

Characteristics of Daily Position Time Series from the Hong Kong Gps Fiducial Network

2008 ◽  
Vol 51 (5) ◽  
pp. 976-990 ◽  
Author(s):  
Lin-Guo YUAN ◽  
Xiao-Li DING ◽  
Wu CHEN ◽  
Simon KWOK ◽  
Siu-Bun CHAN ◽  
...  
Keyword(s):  
Time Series ◽  
Hong Kong ◽  
Position Time Series

Comprehensive Analysis of the Effects of Common Mode Error on the Position Time Series of a Regional GPS Network

2018 ◽  
Vol 176 (6) ◽  
pp. 2565-2579 ◽  
Author(s):  
Zhen Li ◽  
Jianping Yue ◽  
Wang Li ◽  
Dekai Lu ◽  
Jiyuan Hu
Keyword(s):  
Time Series ◽  
Comprehensive Analysis ◽  
Common Mode ◽  
Common Mode Error ◽  
Gps Network ◽  
Position Time Series
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