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Coseismic fault model of the 2017 M_(W)6.5 Jiuzhaigou earthquake and implications for the regional fault slip pattern

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geodesy and Geodynamics 2022年第2期13卷 104-113页

作者： Yang Liu Yangmao Wen Zhicai Li Ying Peng Caijun Xu School of geodesy and Geomatics Wuhan UniversityWuhan 430079China Key Laboratory of Geospace Environment and geodesy Ministry of EducationWuhan UniversityWuhan 430079China Key Laboratory of Geophysical geodesy Ministry of Natural ResourcesWuhan UniversityWuhan 430079China department of geodesy National Geomatics Center of ChinaBeijing 100830China School of Geoscience and surveying Engineering China University of Mining and Technology-BeijingBeijing 100083China Changguang Satellite Technology Co. LtdChangchun 130102China

On August 8,2017,an M_(W)6.5 earthquake occurred in Jiuzhaigou County,Sichuan Province,China,on the eastern margin of the Qinghai-Tibet *** study investigates the coseismic deformation field and fault model with ascending and descending Sentinel-1 synthetic aperture radar(SAR)images,aftershock distribution,and elastic half-space dislocation *** regional fault slip pattern is then quantita-tively examined using the boundary element *** results show that the ascending and descending interferometric synthetic aperture radar(InSAR)coseismic deformation fields display an overall NNW-SSE trend,with more significant deformation on the southwest side of the *** coseismic fault geometry is divided into NW and SE sub-faults with strikes of 162.1°and 149.3°,*** coseismic fault slip is dominated by a left-lateral strike-slip movement with an average rake of-2.31°,mainly occurring at a depth of 0-13.04 km with a shape of an approximately inverted *** fault slip features two peak slip zones,with a maximum of 1.39 *** total seismic moment is 6.34×10^(18) N·m(M_(W)6.47).The boundary element calculation quantitatively indicates that the regional fault slip pattern may be mainly attributable to the changing strike and *** strike changes from NNWeSSE to nearly NS direction,and the dip gradually decreases from the Jiuzhaigou earthquake fault in the north to the Huya fault in the *** these characteristics,the Huya and the Jiuzhaigou earthquake faults form the eastern boundary of the Minshan uplift zone and accommodate the accumulated deformation.

关键词： 2017 M_(W)6.5 Jiuzhaigou earthquake InSAR Fault model Boundary element method Regional fault slip pattern

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Precise orbit determination for LEO satellites:single-receiver ambiguity resolution using GREAT products

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Geo-Spatial Information Science 2022年第1期25卷 63-73页

作者： Xingxing Li Yujie Qin Keke Zhang Jiaqi Wu Wei Zhang Qian Zhang Hongmin Zhang School of geodesy and Geomatics Wuhan UniversityWuhanHubeiChina department of geodesy and Remote Sensing of the German Research Centre for Geosciences(GFZ) PotsdamGermany

In recent years,the large Low Earth Orbit(LEO)constellations have become a hot topic due to their great potential to improve the Global Navigation Satellite Systems(GNSS)positioning *** of the important focus is how to obtain the accurate and reliable orbits for these constellations with dozens of LEO *** GNSS-based Precise Orbit Determination(POD)will be exclusively performed to achieve this goal,where the Integer Ambiguity Resolution(IAR)plays a key role in acquiring high-quality *** this study,we present a comprehensive analysis of the benefit of the single-receiver IAR in LEO POD and discuss its implication for the future LEO *** perform ambiguity-fixed LEO POD for four typical missions,including Gravity Recovery and Climate Experiment(GRACE)Follow-On(GRACE-FO),Swarm,Jason-3 and Sentinel-3,using the Uncalibrated Phase Delay(UPD)products generated by our GREAT(GNSS+REsearch,Application and Teaching)*** results show that the ambiguity fixing processing can significantly improve the accuracy of LEO *** are negligible differences between our UPD-based ambiguity-fixed orbits and those based on the Observable Signal Bias(OSB)and Integer Recovery Clock(IRC)products,indicating the good-quality of UPD products we *** to the float solution,the fixed solution presents a better consistency with the external precise science orbits and the largest accuracy improvement of 5 mm is achieved for GRACE-FO ***,the benefit can be observed in laser ranging residuals as well,with a Standard Deviation(STD)reduction of 3–4 mm on average for the fixed *** from the absolute orbits,the relative accuracy of the space baseline is also improved by 20–30%in the fixed *** result demonstrates the superior performance of the ambiguity-fixed LEO POD,which appears as a particularly promising technique for POD of future LEO constellations.

关键词： Precise orbit determination single-receiver ambiguity resolution onboard GPS observation LEO

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Geopotential difference determination using optic-atomic clocks via coaxial cable time transfer technique and a synthetic test

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geodesy and Geodynamics 2015年第5期6卷 344-350页

作者： Shen Ziyu Shen Wenbin School of geodesy and Geomatics/Key Laboratory of the Geospace Environment and geodesy Wuhan University State Key Laboratory for Information Engineering in surveying Mapping and Remote SensingWuhan University

According to the general theory of relativity, two clocks placed at two different positions with different geopotentials run at different rates. Thus one can determine the geopotential difference between these two points by comparing the running rates of the two clocks. Using the most precise optic-atomic clocks whose stability achieves 10 is level and the time transfer technique with comparison accuracy higher than 10ps level by 100 m coaxial cable, the relativistic geodesy method for determining the geopotential may be realizable in the near future. In this paper, we propose, design and describe in detail an approach for determining the geopotential difference between two points based upon a simulation experiment. We select two stations A and B whose ground distance is within 100 m, height difference being about 30 m. Each station is equipped with an atomic clock whose instability is 3.2 × 10-16/√τ （where τis time in second）. And the two stations are connected with a coaxial cable for time transfer. Our simulation experiment results show that the accuracy could reach 0.16 m2/s2 （equivalent to 1.6 cm in height） level after a fourhour period of observation.

关键词： Geopotential differenceAtomic clockTime transferCoaxial cableSynthetic

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Co-seismic deformation derived from GPS observations during April 20th,2013 Lushan Earthquake,Sichuan,China

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Earthquake Science 2013年第3期26卷 153-160页

作者： Yujun Du Zemin Wang Shujiang Yang Jiachun An Qiang Liu Guowei Che School of geodesy and Geomatics Wuhan University Chinese Antarctic Center of surveying and Mapping Wuhan University Research Center of GNSS Wuhan University Tianjin Institute of surveying and Mapping

We process the standard 30 s, static GPS data and the 1 s, high-rate GPS （HRGPS） data provided by the Crustal Movement Observation Network of China with GAMIT/GLOBK software package, and obtain the co- seismic displacements of near field and far field, and the epoch-by-epoch time series of HRGPS during Lushan earthquake. GPS data from about 20 sites in Sichuan province, which located between 40 and 450 km from the epicenter, are analyzed so as to study the characteristics of the static displacements and the dynamic crustal defor- mations, with periods ranging from several minutes to over a month. The result shows that： the static displacements caused by Lushan earthquake are limited to several centi- meters; the nearest station SCTQ at 43 km from the epi- center has the largest static displacement of about 2 cm, while the other stations generally have insignificant dis- placements of less than 5 mm. the stations in the east ofSichuan-Yunnan region shifts 5-10 mm toward the southwest, and the stations in the middle-west of Sichuan Basin moves indistinctively 1-2 mm toward the northwest; station SCTQ has the largest kinematic displacement of about 4 and 3 cm peak-to-peak on the north and east component, respectively, and is much greater than the static permanent displacement; for the stations located at a distance greater than 150 km from the epicenter, the kinematic motions are generally insignificant; exception- ally, station SCNC and station SCSN in central Sichuan Basin have significant kinematic motions although they are more than 200 km away from the epicenter.

关键词： Lushan earthquake GPS seismology Co-seismic displacement Time series

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Far-zone contributions of airborne gravity anomalies' upward/downward continuation

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geodesy and Geodynamics 2016年第6期7卷 444-450页

作者： Boyang Zhou Zhicai Luo Yihao Wu Yuqiao Cen department of surveying and Mapping Guangdong University of Technology School of geodesy and Geomatics Wuhan University Center for Urban Science and Progress New York University

Airborne gravimetry has become a vital technique in local gravity field approximation, and upward/downward continuation of gravity data is a key process of airborne gravimetry. In these procedures, the integral domain is divided into two parts, namely the near-zone and the far-zone. The far-zone contributions are approximated by the truncation coefficients and a global geo-potential model, and their values are controlled by several issues. This paper investigates the effects of flight height, the size of near-zone cap, and Remove- Compute-Restore （RCR） technique upon far-zone contributions. Results show that at mountainous area the far-zone contributions can be ignored when EIGEN-6C of 360 degree is removed from the gravity data, together with a near-zone cap of 1°and a flight height less than 10 km, while at flat area EIGEN-6C of 180 degree is feasible.

关键词： Airborne gravimetryPoisson integralUpward/downward continuationFat-zone contdbutionsRemove -Compute -Restoretechnique

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Application of Inertia Ellipse in Code Marker Matching

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Geo-Spatial Information Science 2010年第3期13卷 226-229页

作者： XU Fang JIANG Weiwei HE Qing HU Xiaobin School of geodesy and Geomatics Wuhan University 129 Luoyu Road Wuhan 430079 China Key Laboratory of Precise Engineer &lndustry surveying State Bureau of Surveying and Mapping 129 Luoyu RoadWuhan 430079 China

In close-range photogrammetry, 3D information acquisition is based on image matching. The application of code marker helps to improve the level of automatic matching and the matching accuracy. This paper inyestigates the application of inertia ellipse algorithm to code marker matching. We can calculate the inertia ellipse of a target with a certain boundary. First, the method is applied to a single code marker; the angle and scaling are valid. Then, the paper introduces the multi code markers matching method by the inertia ellipse. Rotation and scaling changes of homonymy images can be calculated by inertia ellipse algorithm. These parameters can be used for code marker matching in arbitrary attitude close-range photogrammetry.

关键词： close-range photogrammetry inertia ellipse code marker matching

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A graph-based representation of knowledge for managing land administration data from distributed agencies–A case study of Colombia

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Geo-Spatial Information Science 2022年第2期25卷 259-277页

作者： Luis M.Vilches-Blázquez Jhonny Saavedra Investigación en Computación Instituto Politécnico NacionalMexico CityMexico School of Land surveying Geodesy and Mapping EngineeringUniversidad Politécnica de MadridMadridSpain

Multiple efforts have been performed worldwide around diverse aspects of land ***,land administration data and systems’notorious heterogeneity remains a longstanding challenge to develop a harmonized *** this sense,the traditional Spatial Data Infrastructures adoption is not enough to overcome this challenge since data sources’heterogeneity implies needs related to harmonization interoperability,sharing,and integration in land administration *** paper proposes a graph-based represen-tation of knowledge for integrating multiple and heterogeneous data sources(tables,shape-files,geodatabases,and WFS services)belonging to two Colombian agencies within a decentralized land administration *** knowledge graphs are developed on an ontology-based knowledge representation using national and international standards for land *** approach aims to prevent data isolation,enable cross-datasets integration,accomplish machine-processable data,and facilitate the reuse and exploitation of multi-jurisdictional datasets in a single approach.A real case study demonstrates the applicability of the land administration data cycle deployed.

关键词： Land administration knowledge graph ontology heterogeneity data integration

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Fault Slip Model of 2013 Lushan Earthquake Retrieved Based on GPS Coseismic Displacements

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Journal of Earth Science 2015年第4期26卷 537-547页

作者： Mengkui Li Shuangxi Zhang Chaoyu Zhang Yu Zhang department of Geophysics School of Geodesy and GeomaticsWuhan University Key Laboratory of Geospace Environment and geodesy of Ministry of Education Wuhan University

Lushan Earthquake （-Mw 6.6） occurred in Sichuan Province of China on 20 April 2013, was the largest earthquake in Longmenshan fault belt since 2008 Wenchuan Earthquake. To better understand its rupture pattern, we focused on the influences of fault parameters on fault slips and performed fault slip inversion using Akaike＇s Bayesian Information Criterion （ABIC） method. Based on GPS coseismic data, our inverted results showed that the fault slip was mainly confined at depths. The maximum slip amplitude is about 0.7 m, and the scalar seismic moment is about 9.47x10TM N.m. Slip pattern reveals that the earthquake occurred on the thrust fault with large dip-slip and small strike-slip, such a simple fault slip represents no second sub-event occurred. The Coulomb stress changes （ACFF） matched the most aftershocks with negative anomalies. The in- verted results demonstrated that the source parameters have significant impacts on fault slip distri- bution, especially on the slip direction and maximum displacement.

关键词： Lushan Earthquake slip distribution GPS coseismic data source parameter.

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A global empirical model for estimating zenith tropospheric delay

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Science China Earth Sciences 2016年第1期59卷 118-128页

作者： YAO Yi Bin ZHANG Bao XU Chao Qian HE Chang Yong YU Chen YAN Feng School of geodesy and Geomatics Wuhan University Key Laboratory of Geospace Environment and geodesy Ministry of Education

Tropospheric delay acts as a systematic error source in the Global Navigation Satellite Systems(GNSS) positioning. Empirical models UNB3, UNB3 m, UNB4 and EGNOS have been developed for use in Satellite-Based Augmentation Systems(SBAS). Model performance, however, is limited due to the low spatial resolution of the look-up tables for meteorological parameters. A new design has been established in this study for improving performance of the tropospheric delay model by more effectively eliminating the error produced by tropospheric delay. The spatiotemporal characteristics of the Zenith Tropospheric Delay(ZTD) were analyzed with findings that ZTD exhibits different annual variations at different locations and decreases exponentially with height increasing. Spherical harmonics are utilized based on the findings to fit the annual mean and amplitude of the ZTD on a global scale and the exponential function is utilized for height corrections, yielding the ZTrop model. On a global scale, the ZTrop features an average deviation of ?1.0 cm and Root Mean Square(RMS) of 4.7 cm compared with the International GNSS Service(IGS) ZTD products, an average deviation of 0.0 cm and RMS of 4.5 cm compared with the Global Geodetic Observing System(GGOS) ZTD data, and an average deviation of ?1.3 cm and RMS of 5.2 cm compared with the ZTD data from the Constellation Observing System of Meteorology, Ionosphere, and Climate(COSMIC). The RMS of the ZTrop model is 14.5% smaller than that of UNB3, 6.0% smaller than that of UNB3 m, 16% smaller than that of UNB4, 14.5% smaller than that of EGNOS and equivalent to the sophisticated GPT2+Saas model in comparison with the IGS ZTD products. The ZTrop, UNB3 m and GPT2+Saas models are finally evaluated in GPS-based Precise Point Positioning(PPP), as the models act to aid in obtaining PPP position error less than 1.5 cm in north and east components and relative large error(>5 cm) in up component with respect to the random walk approach.

关键词： Zenith tropospheric delay Spherical harmonics Exponential function ZTrop model

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Detection of the special grav-ity signals in sub-tidal band by using wavelet technique

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Chinese Science Bulletin 2006年第6期51卷 713-722页

作者： SUN Heping ZHENG Dawei DING Xiaoli CHEN Wu CHEN Xiaodong Key Laboratory of Dynamic geodesy Institute of Geodesy and Geophysics Chinese Academy of Sciences Wuhan 430077 China Center for Astrogeodynamics Research Shanghai Astronomical Observatory Chinese Academy of Sciences Shanghai 200030 China department of Land surveying and Geo-Informatics Hong Kong Polytechnic University Hong Kong China

Based on the 5-year length of tidal gravity observations recorded with a superconducting gravimeter at Wuhan International Tidal Gravity Ref-erence Station, the special gravity signals associated with the possible Earth’s solid inner core translational oscillations in sub-tidal bands are detected and studied by using for the first time a wavelet transfor-mation technique. The analysis is conducted on gravity residuals after removing the synthetic tidal gravity signals and air pressure perturbation from original observations, demonstrating that there exist gravity oscillation signals at 4―6 h bands with am-plitude of nGal level. However, it is found that the frequency and amplitude of such kind of oscillation signals change with time, and the analysis shows that these oscillation signals are provoked probably by some non-continuous source with very low ampli-tude.

关键词：潮汐重力信号小波时频光谱分析超导重力仪

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