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Laboratory of Surveying and Mapping Science and Geospatial Information Technology of MNR, CASM","award":["AR2101"],"award-info":[{"award-number":["AR2101"]}]},{"name":"Scientific Research Project of Chinese Academy of Surveying and Mapping","award":["41874042"],"award-info":[{"award-number":["41874042"]}]},{"name":"Scientific Research Project of Chinese Academy of Surveying and Mapping","award":["2021WHZZB1000"],"award-info":[{"award-number":["2021WHZZB1000"]}]},{"name":"Scientific Research Project of Chinese Academy of Surveying and Mapping","award":["2021WHZZB1005"],"award-info":[{"award-number":["2021WHZZB1005"]}]},{"name":"Scientific Research Project of Chinese Academy of Surveying and Mapping","award":["2021-01-01"],"award-info":[{"award-number":["2021-01-01"]}]},{"name":"Scientific Research Project of Chinese Academy of Surveying and Mapping","award":["2021-01-08"],"award-info":[{"award-number":["2021-01-08"]}]},{"name":"Scientific Research Project of Chinese Academy of Surveying and Mapping","award":["AR2101"],"award-info":[{"award-number":["AR2101"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>Extensive observation collection, unified and rigorous data processing, and accurate construction of the station motion model are the three essential elements for the accuracy and reliability of the Global Navigation Satellite System (GNSS) velocity field. GNSS data reprocessing not only can weaken the influence of untrue nonlinear site signals caused by imperfect models but also can eliminate the displacement offset caused by frame transformation, solution strategy, and model change. Based on the new repro3 criteria of the International GNSS Service (IGS), we process rigorously GNSS observations of continental China from the period 2000 to 2020 to refine GNSS station secular velocities and analyze the present-day crustal deformation in continental China. The main contributions of this work included the followings. Firstly, the repro3 algorithm and model are used to uniformly and rigorously process the two-decade GNSS historical observations to obtain more reliable GNSS coordinate time series with mm-level precision. Combined with the historical records of major earthquakes in continental China, we build a GNSS time series model considering nonlinear factors (velocity, offset, period, co-seismic\/post-seismic deformation) to extract GNSS horizontal velocity field whose root mean square (RMS) mean is 0.1 mm\/a. Secondly, the GNSS horizontal grid velocity field in continental China is interpolated using the gpsgridder method (the minimum radius is set to 16, and the Poisson\u2019s ratio is set to 0.5). Estimation and analysis of the crustal strain rate solution lead to the conclusion that the strain degree in West China (the high strain region is mainly located in the Qinghai Tibet Plateau and Tianshan Mountains) is much more intense than that in the east (the main strain rate is less than 5 nstrain\/year). In addition, most strong earthquakes in the Chinese mainland occurred on active blocks and their boundary faults with large changes in the GNSS velocity field and strain field. Then, an improved K-means++ clustering analysis method is proposed to divide active blocks using GNSS horizontal velocity field. Furthermore, different relative motion models of different blocks are constructed using the block division results. Among them, the Eurasian block has the lowest accuracy (the RMS of residual velocity in the east and north directions are 5.60 and 9.65 mm\/a, respectively), and the China block 7 has the highest accuracy (the RMS mean of relative velocity in the east and north directions are 2.60 and 2.65 mm\/a, respectively). More observations (2260+ sites), longer time (20 years), and updated criteria (Repro3) are to finely obtain the GNSS velocity field in continental China, and depict crustal deformation and active block with the gpsgridder and improved K-means++ methods.<\/jats:p>","DOI":"10.3390\/rs14153719","type":"journal-article","created":{"date-parts":[[2022,8,3]],"date-time":"2022-08-03T23:33:01Z","timestamp":1659569581000},"page":"3719","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Two-Decade GNSS Observation Processing and Analysis with the New IGS Repro3 Criteria: Implications for the Refinement of Velocity Field and Deformation Field in Continental China"],"prefix":"10.3390","volume":"14","author":[{"given":"Hu","family":"Wang","sequence":"first","affiliation":[{"name":"Chinese Academy of Surveying and Mapping, Beijing 100036, China"}]},{"given":"Yingying","family":"Ren","sequence":"additional","affiliation":[{"name":"College of Surveying and Geo-Informatics, Tongji University, Shanghai 200092, China"}]},{"given":"Ahao","family":"Wang","sequence":"additional","affiliation":[{"name":"College of Geoscience and Surveying Engineering, China University of Mining and Technology-Beijing, Beijing 100083, China"}]},{"given":"Jiexian","family":"Wang","sequence":"additional","affiliation":[{"name":"College of Surveying and Geo-Informatics, Tongji University, Shanghai 200092, China"}]},{"given":"Yingyan","family":"Cheng","sequence":"additional","affiliation":[{"name":"Chinese Academy of Surveying and Mapping, Beijing 100036, China"}]},{"given":"Shushan","family":"Fang","sequence":"additional","affiliation":[{"name":"Chinese Academy of Surveying and Mapping, Beijing 100036, China"},{"name":"Key Laboratory of Surveying and Mapping Science and Geospatial Information Technology of MNR, CASM, Beijing 100830, China"},{"name":"Beijing Fangshan Human Satellite Laser National Field Scientific Observation and Research Station, Beijing 102406, China"}]},{"given":"Qiang","family":"Yang","sequence":"additional","affiliation":[{"name":"Chinese Academy of Surveying and Mapping, Beijing 100036, China"},{"name":"Key Laboratory of Surveying and Mapping Science and Geospatial Information Technology of MNR, CASM, Beijing 100830, China"},{"name":"Beijing Fangshan Human Satellite Laser National Field Scientific Observation and Research Station, Beijing 102406, China"}]}],"member":"1968","published-online":{"date-parts":[[2022,8,3]]},"reference":[{"key":"ref_1","first-page":"660","article-title":"Present-day tectonic deformation in continental China: Thirty years of GPS observation and research","volume":"36","author":"Wang","year":"2020","journal-title":"Earthq. 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