scholarly journals Pre-seismic gravity anomalies before Linkou M s6.4 earthquake by continuous gravity observation of Crustal Movement Observation Network of China

2017 ◽  
Vol 8 (2) ◽  
pp. 120-124 ◽  
Author(s):  
Xinsheng Wang ◽  
Honglei Li ◽  
Yufei Han
Keyword(s):  
Gravity Anomalies ◽  
Crustal Movement ◽  
Movement Observation ◽  
Observation Network ◽  
Gravity Observation

Spatiotemporal noise in GPS position time-series from Crustal Movement Observation Network of China

2018 ◽  
Vol 216 (3) ◽  
pp. 1560-1577 ◽  
Author(s):  
Wei Wang ◽  
Xuejun Qiao ◽  
Dijin Wang ◽  
Zhengsong Chen ◽  
Pengfei Yu ◽  
...  
Keyword(s):  
Time Series ◽  
Crustal Movement ◽  
Movement Observation ◽  
Observation Network ◽  
Position Time Series ◽  
Spatiotemporal Noise

The Investigations on Crustal Deformation in China under ITRF97 Plate Model using Data of “Crustal Movement Observation Network in China”

2002 ◽  
Vol 45 (3) ◽  
pp. 337-344 ◽  
Author(s):  
Yang FU ◽  
Wen-Yao ZHU ◽  
Xiao-Ya WANG ◽  
Wu-Xing DUAN ◽  
Xian-Bing WU ◽  
...  
Keyword(s):  
Crustal Deformation ◽  
Crustal Movement ◽  
Plate Model ◽  
Movement Observation ◽  
Observation Network ◽  
Using Data

scholarly journals Variations of the ionospheric TEC using simultaneous measurements from the China Crustal Movement Observation Network

2012 ◽  
Vol 30 (10) ◽  
pp. 1423-1433 ◽  
Author(s):  
Y. W. Wu ◽  
R. Y. Liu ◽  
B. C. Zhang ◽  
Z. S. Wu ◽  
J. S. Ping ◽  
...  
Keyword(s):  
Crustal Movement ◽  
Topside Ionosphere ◽  
Electron Content ◽  
Equatorial Anomaly ◽  
Total Electron ◽  
Movement Observation ◽  
The North ◽  
Ionospheric Total Electron Content ◽  
Observation Network ◽  
Two Peaks

Abstract. Variations of the ionospheric Total Electron Content (TEC) over China are investigated using the TEC data obtained from China Crustal Movement Observation Network in the year 2004. The results show a single-peak occurred in post-noon for the diurnal variation and two peaks exit around two equinox points, respectively, for the seasonal variation. Overall, the values of TEC increased from the north to the south of China. There were small but clear longitudinal differences in both sides of the longitudes with zero magnetic declination. The intensity of the day-to-day variation of TEC was not a monotonic change along the latitudes. It was usually weaker in the middle of China than that in the north or south. Comparing with the maximum F-layer electron density (NmF2) derived from the ionosonde stations in China, it is found that the day-to-day variation of TEC was less significant than that of NmF2, and that the northern crest of the equatorial anomaly identified from the NmF2 data can reach Guangzhou-region. While, the TEC crest was hardly observed in the same location. This is probably caused by the tilt of topside ionosphere near the northern anomaly crest region at lower latitudes.

scholarly journals Positioning Performance of BDS Observation of the Crustal Movement Observation Network of China and Its Potential Application on Crustal Deformation

Sensors ◽  
2018 ◽  
Vol 18 (10) ◽  
pp. 3353 ◽  
Author(s):  
Xiaoning Su ◽  
Guojie Meng ◽  
Haili Sun ◽  
Weiwei Wu
Keyword(s):  
Time Series ◽  
Crustal Deformation ◽  
Potential Application ◽  
Flicker Noise ◽  
Crustal Movement ◽  
Movement Observation ◽  
North East ◽  
Noise Characteristics ◽  
Observation Network ◽  
Position Time Series

The Crustal Movement Observation Network of China (CMONOC) has begun receiving BeiDou Navigation Satellite System (BDS) observations since 2015, and accumulated more than 2.5 years of data. BDS observations has been widely applied in many fields, and long-term continuous data provide a new strategy for the study of crustal deformation in China. This paper focuses on the evaluation of BDS positioning performance and its potential application on crustal deformation in CMONOC. According to the comparative analysis on multipath delay (MPD) and signal to noise ratio (SNR) between BDS and GPS data, the data quality of BDS is at the same level with GPS measurements in COMONC. The spatial distribution of BDS positioning accuracy evaluated as the root mean square (RMS) of daily residual position time series on horizontal component is latitude-dependent, declining with the increasing of station latitude, while the vertical one is randomly distributed in China. The mean RMS of BDS position residual time series is 7 mm and 22 mm on horizontal and vertical components, respectively, and annual periodicity in position time series can be identified by BDS data. In view of the accuracy of BDS positioning, there are no systematic differences between GPS and BDS results. Based on time series analysis with data volume being 2.5 years, the noise characteristics of BDS daily position time series is time-correlated and corresponding noise is white plus flicker noise model, and the derived mean RMS of the BDS velocities is 1.2, 1.5, and 4.1 mm/year on north, east, and up components, respectively. The imperfect performance of BDS positioning relative to GPS is likely attributed to the relatively low accuracy of BDS ephemeris, and the sparse amount of MEO satellites distribution in the BDS constellation. It is expectable to study crustal deformation in CMONOC by BDS with the gradual maturity of its constellation and the accumulation of observations.

scholarly journals Monitoring the ionosphere based on the Crustal Movement Observation Network of China

2015 ◽  
Vol 6 (2) ◽  
pp. 73-80 ◽  
Author(s):  
Yunbin Yuan ◽  
Zishen Li ◽  
Ningbo Wang ◽  
Baocheng Zhang ◽  
Hui Li ◽  
...  
Keyword(s):  
Crustal Movement ◽  
Movement Observation ◽  
Observation Network

Analysis of deterministic and stochastic models of GPS stations in the crustal movement observation network of China

2019 ◽  
Vol 64 (2) ◽  
pp. 335-351 ◽  
Author(s):  
Shuguang Wu ◽  
Guigen Nie ◽  
Jingnan Liu ◽  
Changhu Xue ◽  
Jing Wang ◽  
...  
Keyword(s):  
Stochastic Models ◽  
Crustal Movement ◽  
Movement Observation ◽  
Observation Network

scholarly journals Evaluating temporal stability of the New Zealand quasigeoid following the 2016 Kaikōura earthquake using satellite radar remote sensing

2019 ◽  
Vol 220 (3) ◽  
pp. 1917-1927
Author(s):  
J C McCubbine ◽  
V Stagpoole ◽  
F Caratori Tontini ◽  
W E Featherstone ◽  
M C Garthwaite ◽  
...  
Keyword(s):  
New Zealand ◽  
Temporal Stability ◽  
Gravity Anomalies ◽  
Field Measurements ◽  
Observation Data ◽  
Land Uplift ◽  
Synthetic Aperture Radar Data ◽  
Gravity Observation ◽  
Kaikoura Earthquake ◽  
The Impact

SUMMARY Quasigeoid models can be determined from surface gravity anomalies, so are sensitive to changes in the shape of the topography as well as changes in gravity. Here we present results of forward modelling gravity/quasigeoid changes from synthetic aperture radar data following the 2016 Mw 7.8 Kaikōura earthquake with land uplift of up to 10 m. We assess the impact of the topographic deformation on the reference surface of the New Zealand vertical datum in lieu of costly field gravity field measurements. The most significant modelled gravity and quasigeoid changes are—2.9 mGal and 5–7 mm, respectively. We compare our forward modelled gravity signal to terrestrial gravity observation data and show that differences between the data sets have a standard deviation of ±0.1 mGal. The largest modelled change in the quasigeoid is an order of magnitude smaller than the 57.7 mm estimated precision of the most recently computed NZGeoid model over the Kaikōura region. Modelled quasigeoid changes implied by this particular deformation event are not statistically significant with respect to estimated precision of the New Zealand quasigeoid model.

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