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First acceptance testing of multiple A10 absolute gravimeters in China and analysis of the comparison results

Geodesy and Geodynamics 2023年第4期14卷 401-410页

作者： Xiaotong Zhang Hao Zhou Ying Jiang Dulin Zhai Gongzhe Wei Hui Li Ziwei Liu Institute of Seismology China Earthquake AdministrationWuhan 430071China Institute of Disaster Prevention Hebei Langfang 065201China gravitation and earth tides national observation and research station Wuhan 430071China Hubei earthquake Administration Wuhan 430071China

Three A10 absolute gravimeters(AGs) were first acquired in China by the Hubei earthquake Agency under the Belt and Road Seismic Monitoring Network Project. Although AG measuring and testing technique is not new, the purchase and simultaneous testing of 3 A10 absolute gravimeters is unprecedented in China. This study conducted the first acceptance testing of the AGs at 3 locations(the Jiufengshan Gravity observation station, the Global Navigation Satellite System observation station in Wuhan, and the Jiugongshan observation station in Xianning). The results were compared using a method based on expert validation, and the acceptance testing scheme was formulated by referring to the Technical Regulations for Tectonic Environment Monitoring Networks in China and Specifications for Gravimetry Control. Based on the repeatability, precision, and consistency of the measured g values, the results from each instrument were evaluated using the air pressure precision test. Comparing the instrument reference values, the final test results can identify the indicator parameters for 3 A10 AGs, the effects of the surrounding environment, and the related parameters on measurement precision. The precision of A10-059, A10-058, and A10-057 exceeded 0.78 μGal, 0.79 μGal, and 0.42 μGal, *** testing scheme can be used as a reference for conducting acceptance testing of AGs in the future and obtaining absolute gravimetric measurements.

关键词： gravitational acceleration Comparison of absolute gravimeters A10 absolute gravimeters Instrument precision

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Moho depth inversion in the Tibetan Plateau from high-precision gravity data

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earth and Planetary Physics 2023年第4期7卷 487-498页

作者： HuiYou He Jian Fang HePing Sun DongMei Guo ZhiXin Xue Jing Hou State Key Laboratory of Geodesy and earth’s Dynamics Innovation Academy for Precision Measurement Science and TechnologyChinese Academy of SciencesWuhan 430077China Wuhan gravitation and Solid earth tides national observation and research station Wuhan 430071China University of Chinese Academy of Sciences Beijing 100049China

The Tibetan Plateau(TP)is the youngest orogenic belt resulting from a continental collision on the *** is a natural laboratory for studying continental dynamics,such as continental convergence,plate subduction,and plateau *** the deep structure of the TP has always been a popular issue in geological *** Moho is the boundary between the crust and the mantle and therefore plays a crucial role in the earth’s *** such as depth and lateral variation,as well as the fine structure of the crust-mantle interface,reveal the lithospheric dynamics in the *** methods are generally employed to study the Moho surface:seismic detection and gravity *** detection has the characteristic of high precision,but it is limited to a few cross-sectional lines and is quite *** is not suitable for and cannot be carried out over a large area of the *** Moho depth over a large area can be obtained through gravity inversion,but this method is affected by the nature of gravity data,and the accuracy of the inversion method is lower than that of seismic *** this work,a high-precision gravity field model was *** Parker-Oldenburg interface inversion method was used,within the constraints of seismic observations,and the Bott iteration method was introduced to enhance the inversion *** Moho depth in the TP was obtained with high precision,consistent with the seismic detection *** research results showed that the shape of the Moho in the TP is complex and the variation range is large,reaching 60−80 *** contrast with the adjacent area,a clear zone of sharp variation appears at the edge of the *** the interior of the TP,the buried depth of the Moho is characterized by two depressions and two *** the south of the Yarlung Zangbo River,the Moho inclines to the north,and to the north,the Moho depresses downward,which was interpreted as the Indian plate subducting to the north below Tib

关键词： gravity Moho Tibetan Plateau SGG-UGM-2(2159-order high-precision gravity field model)

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Coseismic deformation and fault slip distribution of the 2023 M_(W)7.8 and M_(W)7.6 earthquakes in Türkiye

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earthquake Science 2024年第3期37卷 263-276页

作者： Weikang Li Lijiang Zhao Kai Tan Xiaofei Lu Caihong Zhang Chengtao Li Shuaishuai Han Institute of Seismology China Earthquake AdministrationWuhan 430071China Wuhan gravitation and Solid earth tides national observation and research station Wuhan 430071China School of Geological Engineering and Geomatics Chang'an UniversityXi'an 710054China

On February 6,2023,a devastating earthquake with a moment magnitude of M_(W)7.8 struck the town of Pazarcik in south-central Türkiye,followed by another powerful earthquake with a moment magnitude of M_(W)7.6 that struck the nearby city of Elbistan 9 h *** study the characteristics of surface deformation caused by this event and the influence of fault rupture,this study calculated the static coseismic deformation of 56 stations and dynamic displacement waveforms of 15 stations using data from the Turkish national fixed global navigation satellite system(GNSS)network.A maximum static coseismic displacement of 0.38 m for the M_(W)7.8 Kahramanmaras earthquake was observed at station ANTE,36 km from the epicenter,and a maximum dynamic coseismic displacement of 4.4 m for the M_(W)7.6 Elbistan earthquake was observed at station EKZ1,5 km from the *** rupture-slip distributions of the two earthquakes were inverted using GNSS coseismic deformation as a *** results showed that the Kahramanmaras earthquake rupture segment was distinct and exposed on the ground,resulting in significant rupture slip along the Amanos and Pazarcik fault segments of the East Anatolian *** maximum slip in the Pazarcik fault segment was 10.7 m,and rupture occurred at depths of 0–15 *** the Cardak fault region,the Elbistan earthquake caused significant ruptures at depths of 0–12 km,with the largest amount of slip reaching 11.6 *** Coulomb stress change caused by the Kahramanmaras earthquake rupture along the Cardak fault segment was approximately 2 bars,and the area of increased Coulomb stress corresponded to the subsequent rupture region of the M_(W)7.6 ***,it is likely that the M_(W)7.8 earthquake triggered or promoted the M_(W)7.6 *** on the cumulative stress impact of the M_(W)7.8 and M_(W)7.6 events,the southwestern segment of the East Anatolian Fault,specifically the Amanos fault segment,experienced a Coulomb rupture stress change exc

关键词： 2023 Türkiye earthquake GNSS observation coseismic deformation field slip distribution

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A data-adaptive network design for the regional gravity field modelling using spherical radial basis functions

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Geodesy and Geodynamics 2024年第6期15卷 627-634页

作者： Fang Zhang Huanling Liu Hanjiang Wen Chinese Academy of Surveying and Mapping Beijing 100036China Beijing Fangshan Satellite Laser Ranging national observation and research station Beijing 102406China

A high-precision regional gravity field model is significant in various geodesy *** the field of modelling regional gravity fields,the spherical radial basis functions(SRBFs)approach has recently gained widespread attention,while the modelling precision is primarily influenced by the base function *** this study,we propose a method for constructing a data-adaptive network of SRBFs using a modified Hierarchical Density-Based Spatial Clustering of Applications with Noise(HDBSCAN)algorithm,and the performance of the algorithm is verified by the observed gravity data in the Auvergne ***,the turning point method is used to optimize the bandwidth of the basis function spectrum,which satisfies the demand for both high-precision gravity field and quasi-geoid modelling *** experimental results indicate that our algorithm has an accuracy of about 1.58 mGal in constructing the gravity field model and about 0.03 m in the regional quasi-geoid *** to the existing methods,the number of SRBFs used for modelling has been reduced by 15.8%,and the time cost to determine the centre positions of SRBFs has been saved by 12.5%.Hence,the modified HDBSCAN algorithm presented here is a suitable design method for constructing the SRBF data adaptive network.

关键词： Regional gravity field modelling Spherical radial basis functions Poisson kernel function HDBSCAN clustering algorithm

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Magnetic-field-sensitive multi-wave interference

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Frontiers of physics 2023年第5期18卷 201-207页

作者： Wenhua Yan Xudong Ren Wenjie Xu Zhongkun Hu Minkang Zhou MOE Key Laboratory of Fundamental Physical Quantities Measurements Hubei Key Laboratory of Gravitation and Quantum PhysicsPGMF and School of PhysicsHuazhong University of Science and TechnologyWuhan 430074China Wuhan Institute of Quantum Technology Wuhan 430206China

We report an experimental study of magnetic-field-sensitive multi-wave interference,realized in a three-wave RF-atom *** the F=1 hyperfine level of the ^(87)Rb 5^(2)S_(1/2) ground state,Ramsey fringes were observed via the spin-selective Raman detection.A decrease in the fringe contrast was observed with increasing free evolution *** maximum evolution time for observable fringe contrasts was investigated at different atom temperatures,under free-falling and trapped *** the main interest of the Ramsey method,the improvement in magnetic field resolution is observed with an increase of evolution time T up to 3 ms and with the measurement resolution reaching 0.85 *** study paves the way for precision magnetic field measurements based on cold atoms.

关键词： atom interferometer magnetometer cold atom device multi-wave interference

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A New Perspective about Climate Change

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地球科学期刊（中英文版） 2015年第1期5卷 12-17页

作者： K. B. Mao Y. Ma T.R. Xu Q. Liu J Q. Han L. Xia X. Y. Shen T. J. He national Hulunber Grassland Ecosystem observation and research station Institute of Agricultural Resources and RegionalPlanning Chinese Academy of Agricultural Sciences Beijing 100081 China Chinese Agricultural Big Data and Nutrition research Institute Pokfulam Hong Kong State Key Laboratory of Remote Sensing Science Jointly Sponsored by the Institute of Remote Sensing Applications ofChinese Academy of Sciences and Beijing Normal University Beijing 100875 China Hydrometeorology and Remote Sensing Laboratory University of Oklahoma Norman 73072 USA Department of Geography University of Toronto Toronto M5 S 3G3 Canada

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Slip rate and interseismic coupling along the Moxi-Shimian segment of the Xianshuihe fault, Eastern Qinghai-Xizang Plateau

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Geodesy and Geodynamics 2024年第4期15卷 338-351页

作者： Xinyu Zhao Gang Liu Zhaosheng Nie Wei Xiong Wei Chen Mu Lin Dijin Wang Qi Li Jiansheng Yu Dongzhen Wang Pengfei Yu Institute of Seismology China Earthquake AdministrationWuhan 430071China Key Laboratory of earthquake Geodesy.China earthquake Administration Wuhan 430071China State Key Laboratory of Geodesy and earth's Dynamics Innovation Academy for Precision Measurement Science and TechnologyChinese Academy of SciencesWuhan 430077China

On September 5,2022,the Luding M6.8 earthquake occurred in the Moxi-Shimian segment of the Xianshuihe fault,coinciding with the historical ruptured zone of the 1786 Moxi *** seis-mogenic environment provides a foundation for comprehending the mechanism of the earthquake and its future *** the Moxi-Shimian segment,we establish a series of near-field Global Navigation Satellite Systems(GNsS)stations to enhance the spatial resolution of observational data for the inversion of the interseismic kinematic *** this study,with an elastic screw dislocation model con-strained by GNsS observations,the slip rate of the Moxi-Shimian segment is estimated to be 10.9±1.0 mm/yr,while the locking depth is 15.7±6.2 ***,we utilize a block-dislocation model to invert the interseismic fault coupling along the Kangding-Moxi-Shimian *** result indicates a gradual deepening of the locking depth along the section from Kangding to *** coseismic rupture of the 2022 event occurred within the high coupling regions in the Kangding-Moxi-Shimian segment,which indicates that the rupture kinematics in this event might be controlled by the interseismic *** seismic moment accumulated within the ruptured zone of the Luding earthquake since 1786 ranges in[1.42-3.40]×10^(19) N-m,which is significantly greater than the seismic moment released during the 2022 *** a result,we infer that the Luding earthquake released only a portion of the accumulated energy within the original rupture zone since 1786,indicating that the 2022 event has not caused a complete rupture in the Moxi-Shimian ***,there remains a substantial seismic hazard in this area.

关键词： Moxi-Shimian segment of Xianshuihe fault Luding earthquake Global positioning system Interseismic kinematic parameters

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Estimating the Fluid Core Resonance Based on Strain observation

Estimating the Fluid Core Resonance Based on Strain Observat...

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作者： Yoshiaki Tamura Koji Matsumoto Tadahiro Sato national Astronomical Observatory 2-12 Hoshigaoka Mizusawa Iwate 023-0861 Japan

Esashi earth tides station has been operated for tidal observations from 1979. Among the observations, a long term extensometer data for 3 components of both free end point recorders and middle point

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