Vertical crustal movement around the southeastern Tibetan Plateau constrained by GPS and GRACE data

Hao, Ming; Freymueller, J. T.; Wang, Qingliang; Cui, Duxin; Qin, Shanlan

doi:10.1016/j.epsl.2015.12.038

Cited by 77 publications

(46 citation statements)

References 34 publications

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“…We estimated this daily frame alignment transformation using a set of reliable ITRF stations (∼ 10 stations each day). In the GPS processing, corrections for solid Earth tides were undertaken, and ocean tide loading effects were corrected using ocean tide model FES2004 with Greens Functions modelled in the reference frame of CM (centre of the mass of the total Earth system) to maintain theoretical consistency and adherence to current IERS conventions (Hao et al, 2016;, but atmospheric pressure loading or any other loading variations (non-tidal ocean loading) with periods > 1 day were not removed. In order to focus on the seasonal and trend feature over the entire observation time, we first smoothed the data to reduce large scatter before using a 3-month-wide moving window filter to remove the short-period terms.…”

Section: Gps Datamentioning

confidence: 99%

Detecting seasonal and long-term vertical displacement in the North China Plain using GRACE and GPS

Wang

Chen

et al. 2017

Hydrol. Earth Syst. Sci.

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Abstract. In total, 29 continuous Global Positioning System (GPS) time series data together with data from Gravity Recovery and Climate Experiment (GRACE) are analysed to determine the seasonal displacements of surface loadings in the North China Plain (NCP). Results show significant seasonal variations and a strong correlation between GPS and GRACE results in the vertical displacement component; the average correlation and weighted root-meansquares (WRMS) reduction between GPS and GRACE are 75.6 and 28.9 % respectively, when atmospheric and nontidal ocean effects were removed, but the annual peak-topeak amplitude of GPS (1.2-6.3 mm) is greater than the data (1.0-2.2 mm) derived from GRACE. We also calculate the trend rate as well as the seasonal signal caused by the mass load change from GRACE data; the rate of GRACEderived terrestrial water storage (TWS) loss (after multiplying by the scaling factor) in the NCP was 3.39 cm yr −1 (equivalent to 12.42 km 3 yr −1 ) from 2003 to 2009. For a 10-year time span (2003 to 2012), the rate loss of TWS was 2.57 cm yr −1 (equivalent to 9.41 km 3 yr −1 ), which is consistent with the groundwater storage (GWS) depletion rate (the rate losses of GWS were 2.49 and 2.72 cm yr −1 during 2003-2009 and 2003-2012 respectively) estimated from GRACE-derived results after removing simulated soil moisture (SM) data from the Global Land Data Assimilation System (GLDAS)/Noah model. We also found that GRACEderived GWS changes are in disagreement with the groundwater level changes from observations of shallow aquifers from 2003 to 2009, especially between 2010 and 2013. Although the shallow groundwater can be recharged from the annual climate-driven rainfall, the important facts indicate that GWS depletion is more serious in deep aquifers. The GRACE-derived result shows an overall uplift in the whole region at the 0.37-0.95 mm yr −1 level from 2004 to 2009, but the rate of change direction is inconsistent in different GPS stations at the −0.40-0.51 mm yr −1 level from 2010 to 2013. Then we removed the vertical rates, which are induced by TWS from GPS-derived data, to obtain the corrected vertical velocities caused by tectonic movement and human activities. The results show that there are uplift areas and subsidence areas in NCP. Almost the whole central and eastern region of NCP suffers serious ground subsidence caused by the anthropogenic-induced groundwater exploitation in the deep confined aquifers. In addition, the slight ground uplifts in the western region of NCP are mainly controlled by tectonic movement (e.g. Moho uplifting or mantle upwelling).

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Section: Gps Datamentioning

confidence: 99%

Detecting seasonal and long-term vertical displacement in the North China Plain using GRACE and GPS

Wang

Chen

et al. 2017

Hydrol. Earth Syst. Sci.

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“…Meanwhile, the vertical crustal deformation throughout Tibet at different spatial and temporal scales (e.g. surface short-term and long-term crustal deformation) brings us new insights on the dynamics of contemporary tectonic processes202122232425. However, how the crustal three-dimensional (3D) deformation varies and the dynamics mechanism of underlying material changes in and around Tibet remains controversy81418.…”

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confidence: 99%

Contemporary crustal movement of southeastern Tibet: Constraints from dense GPS measurements

Pan

Shen

2017

Sci Rep

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The ongoing collision between the Indian plate and the Eurasian plate brings up N-S crustal shortening and thickening of the Tibet Plateau, but its dynamic mechanisms remain controversial yet. As one of the most tectonically active regions of the world, South-Eastern Tibet (SET) has been greatly paid attention to by many geoscientists. Here we present the latest three-dimensional GPS velocity field to constrain the present-day tectonic process of SET, which may highlight the complex vertical crustal deformation. Improved data processing strategies are adopted to enhance the strain patterns throughout SET. The crustal uplifting and subsidence are dominated by regional deep tectonic dynamic processes. Results show that the Gongga Shan is uplifting with 1–1.5 mm/yr. Nevertheless, an anomalous crustal uplifting of ~8.7 mm/yr and negative horizontal dilation rates of 40–50 nstrain/yr throughout the Longmenshan structure reveal that this structure is caused by the intracontinental subduction of the Yangtze Craton. The Xianshuihe-Xiaojiang fault is a major active sinistral strike-slip fault which strikes essentially and consistently with the maximum shear strain rates. These observations suggest that the upper crustal deformation is closely related with the regulation and coupling of deep material.

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“…The crustal vertical deformation obtained by GRACE can be used to exclude the non-tectonic impact caused by land water storage in the GPS results. SLMs can not only remove the corresponding seasonal effect of surface loadings in the GPS results, but also provide smaller scale change information that cannot be resolved by GRACE [12][13][14]. The combination of GRACE and SLMs is used to remove the effect of non-tectonic seasonal signals in the GPS data, which is helpful for obtaining accurate tectonic deformation field information and other geophysical phenomena we are interested in within the target area [15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Characterizing the Seasonal Crustal Motion in Tianshan Area Using GPS, GRACE and Surface Loading Models

Zhao

Bao

et al. 2017

Remote Sensing

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Abstract:Complex tectonic and non-tectonic movements exist in the Tianshan area. However, we have not acquired good knowledge of such movements yet. In this study, we combine Global Positioning System (GPS), the Gravity Recovery and Climate Experiment (GRACE) and Surface Loading Models (SLMs) data to study the seasonal vertical crustal displacements in the Tianshan area. The results show that all three datasets exhibit significant annual variations at all 26 local GPS stations. Correlation coefficients higher than 0.8 between the GRACE and GPS data were observed at 85% of the stations, and it became 92% when comparing GPS and SLMs. The Weighted Root Mean Squares (WRMS) reductions were 41% and 47% after removing the annual displacements of GRACE and SLMs from the GPS time series, respectively. The consistency between the GPS and SLMs data was higher than that between the GPS and GRACE data, which is mainly due to the dominant position of atmospheric loading in the study area. For the abnormal station XJYN (43 • N, 81 • E), the GPS time series showed an abnormal uplift from early 2013 to early 2015, but this not shown in the GRACE and SLMs results. We attribute this discrepancy to groundwater variations, which are not resolvable by GRACE and SLMs for small-scale regions.

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Vertical crustal movement around the southeastern Tibetan Plateau constrained by GPS and GRACE data

Cited by 77 publications

References 34 publications

Detecting seasonal and long-term vertical displacement in the North China Plain using GRACE and GPS

Detecting seasonal and long-term vertical displacement in the North China Plain using GRACE and GPS

Contemporary crustal movement of southeastern Tibet: Constraints from dense GPS measurements

Characterizing the Seasonal Crustal Motion in Tianshan Area Using GPS, GRACE and Surface Loading Models

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