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| 1 | Characteristics of subsurface density variations before the 4.20 Lushan M_s7.0 earthquake in the Longmenshan area: inversion results显示文摘The 4.20 Lushan MS7.0 earthquake occurred on the southwest segment of the Longmenshan fault on 20 April 2013. Some meaningful information on the preparation and occurrence of this earthquake was found based on the dynamic variation of gravity(DVG). To examine the great progress of the Lushan earthquake, we obtained the density variation(DENV) derived from the DVG using the compact gravity inversion method in this article. The inversion results reveal three main findings:(1) the DENV in the crust in the Jinshajiang fault area changed from positive in 2010–2011 to negative in 2011–2012.(2) The DENV in the Xianshuihe fault area decreased continuously from 2010 to 2012.(3) The DENV of the uppermost mantle of South China decreased in 2010–2011 and increased in 2011–2012. We propose that the flow/expansion of the middle-lower crust beneath the Bayan Har block and Moho subsidence on the southwest margin of the Chuan-Dian block may have been the major causes of the Lushan earthquake. | Songbai Xuan Chongyang Shen Hui Li Hongtao Hao | 2015 | Earthquake Science2015，28，1： | 5 |
| 2 | Estimating Moho basement and faults using gravity inversion in Yushu-earthquake area,China显示文摘A gravity survey was conducted one month after the 2010 Yushu earthquake in the epicenter area.The cross-fault survey line was 500 km long,from Langqian county to Qingshuihe county,in a transition zone between Bayan Har block and Qiangtang block,in an area of high elevation,large undulating terrain,and complex geological features.An interpretation of the data was carried out together with other kinds of data,such as seismic exploration and magnetic exploration.The result shows that gravity is sensitive to fault boundary;the geologic structure of the region is complex at middle and upper depths,and the density profile reveals an eastward-pushing fault movement. | Yang Guangliang | 2012 | Geodesy and Geodynamics2012，3，2： | 4 |
| 3 | Simulation of coseismic effects of the Ms7. 0 Lushan earthquake显示文摘Using plane dislocation theory and the seismic-wave inversion results from the Institute of Geophysics,China Earthquake Administration and the Institute of Geodesy and Geophysics,Chinese Academy of Sciences models,the surface coseismic deformation and gravity changes caused by the 2013 Ms7.0 Lushan earthquake are simulated.The simulations of coseismic gravity change and deformation indicate that the dislocation has dip-slip characteristics.The results also show that the coseismic deformation exhibits a symmetrical,positive-and-negative distribution,with the deformation usually being less than 10 mm in the farfield but up to 140 mm in the near-field.The gravity changes are concentrated on the fault-projection area,which is greatly affected by the vertical surface deformation.The gravity change and vertical deformation in the far field are usually less than and 5 mm,respectively,but reach and 330 mm,respectively,in the near field.The simulated results agree well with the measured results,which suggests a theoretical basis for the observed change in gravity before and after this earthquake. | Tan Hongbo Shen Chongyang Wei Jin Zhao Bin Wang Jian Xuan Songbai | 2013 | Geodesy and Geodynamics2013，4，3： | 3 |
| 4 | Temporal gravity changes before the 2008 Yutian Ms7.3 earthquake显示文摘Based on the data of the repeated gravity observation network in Chinese mainland since 1998,we analyzed the temporal changes of regional gravity field before the 2008 Yutian Ms7.3 earthquake.The result shows some mid-to-long term(two to ten years)changes during the earthquake's preparation.Notable features are a gravity increase lasting several years and a relatively large-scaled gradient zone of gravity change,the former indicating a continuous energy accumulation and the latter a possible location of seismic rupture.These gravity changes showed a trend of increase-accelerated increase-decelerated increase,similar to that of the Tangshan Ms7.8 earthquake in 1976.The maximum accumulated gravity change related to the earthquake reached 200×10-8 ms-2. | Shen Chongyang Li Hui Sun Shaoan Yang Guangliang Xuan Songbai Tan Hongbo Liu Shaoming | 2012 | Geodesy and Geodynamics2012，3，1： | 3 |
| 5 | Long-term gravity changes in Chinese mainland from GRACE and ground-based gravity measurements显示文摘A long-term (9 years) gravity change in Chinese mainland is obtained on the basis of observations of the ground-based national gravity network. The result shows several features that may be related to some large-scale groundwater pumping in North China, glacier-water flow and storage in Tianshan region, and pre-seismic gravity changes of the 2008 Ms8.0 Wenchuan earthquake, which are spatially similar to co-seismic changes but reversed in sign. These features are also shown in the result of the satellite-based GRACE observation, after a height effect is corrected with GPS data. | Xing Lelin Li Hui Xuan Songbai Kang Kaixuan Liu Xiaoling | 2011 | Geodesy and Geodynamics2011，2，3： | 3 |
| 6 | Trends in gravity changes from 2009 to 2013 derived from ground-based gravimetry and GRACE data in North China显示文摘North China is a key region for studying geophysical progress. In this study, ground-based and Gravity Recovery and Climate Experiment(GRACE) gravity data from 2009 to 2013 are used to calculate the gravity change rate(GCR) using the polynomial fitting method. In general, the study area was divided into the Shanxi rift, Jing-Jin-Ji(Beijing-Tianjin-Hebei Province), and Bohai Bay Basin(BBB) regions. Results of the distribution of the GCR determined from ground-based gravimetry show that the GCR appears to be 'negativepositive-negative' from west to east, which indicates that different geophysical mechanisms are involved in the tectonic activities of these regions. However, GRACE solutions are conducted over a larger spatial scale and are able to show a difference between southern and northern areas and a mass redistribution of land water storage. | Shen Chongyang Xuan Songbai Zou Zhengbo Wu Guiju | 2015 | Geodesy and Geodynamics2015，6，6： | 3 |
| 7 | Wenchuan Ms8.0 earthquake coseismic slip distribution inversion显示文摘By using GPS and gravity data before and after the Wenchuan Ms8.0 earthquake and combining data from geological surveys and geophysical inversion studies, an initial coseismic fault model is constructed. The dip angle changes of the fault slip distribution on the fault plane are inversed, and the inversion results show that the shape of the fault resembles a double-shovel. The Yingxiue Beichuan Fault is approximately 330 km long, the surface fault dip angle is 65.1, which gradually reduces with increasing depth to 0 at the detachment layer at a depth of 19.62 km. The Guanxiane Jiangyou Fault is approximately90 km long, and its dip angle at the surface is 55.3, which gradually reduces with increasing depth; the fault joins the Yingxiue Beichuan Fault at 13.75 km. Coseismic slip mainly occurs above a depth of 19 km. There are five concentrated rupture areas, Yingxiu,Wenchuan, Hanwang, Beichuan, and Pingwu, which are consistent with geological survey results and analyses of the aftershock distribution. The rupture mainly has a thrust component with a small dextral strikeeslip component. The maximum slip was more than10 m, which occurred near Beichuan and Hanwang. The seismic moment is 7.84 1020 Nm(Mw7.9), which is consistent with the seismological results. | Tan Hongbo Wu Guiju Xuan Songbai Yang Guangliang Fan Wenhua Shen Chongyang | 2015 | Geodesy and Geodynamics2015，6，3： | 1 |
| 8 | Isostatic anomaly characteristics and tectonism of the New Britain Trench and neighboring Papua New Guinea显示文摘In this paper, we calculated Bouguer gravity anomalies and Airy-Heiskanen isostatic anomalies in the New Britain Trench and surrounding areas of Papua New Guinea. The calculations are based on a topographic model and a gravity anomaly model from the Scripps Institute of Oceanography. Characteristics of the isostatic anomaly and the earthquake dynamic environment of this region are analyzed,and the results show that there are obvious differences in the isostatic state between each block in the region. Tectonic movements are very intense in regions with high positive or negative isostatic gravity anomalies, and a number of sub-plates in this area are driven by external tectonic action, such as plate subduction and thrusting, of the Pacific, Indo-Australian and Eurasian plates. From the distribution of the isostatic gravity anomaly, the tectonic action of anti-isostatic movement obviously is the main source of power. Based on isostatic gravity and spatial distribution of earthquakes in the region, it is obvious that further contraction of the Indo-Australian Plate will result in the southwestern part of the Solomon Plate becoming part of the Owen Stanley thrust belt, and the northern part will enter the lower part of the Bismarck Plate. The eastern part of the Solomon Plate will enter the front of the Pacific Plate, resulting in northward and eastward migration of significant earthquakes along the Solomon Plate. | Guangliang Yang Chongyang Shen Jiapei Wang Songbai Xuan Guiju Wu Hongbo Tan | 2018 | Geodesy and Geodynamics2018，9，5： | 1 |
| 9 | Dynamic changes of gravity fields before and after the 2008 Wenchuan earthquake(Ms8.0)显示文摘The pattern evolution and dynamic mechanism of the dynamic changes of regional gravity fields occurring before and after the Wenchuan Ms8.0 earthquake are analyzed,based on five epochs of 1998-2007 mobile gravity data from the middle-south section of the north-south seismic belt,and two epochs of field research data collected after the 2008 Wenchuan earthquake in combination with GPS data,leveling observations,and geotectonic environment data.The regional dynamic gravity changes demonstrate the effects of the eastward flow of solid matter in the Qinghai-Tibetan plateau and the preparation of the 2008 Wenchuan earthquake(2-10 yr).The two most meaningful gravity indicators of the Wenchuan earthquake preparation are the positive(increasing) gravity changes occurring over many years in the southwest epicenter and the largescale gradient zone of gravity variation,with the cumulative difference between the two sides of the gradient zone of gravity exceeding 200 μGal.The positive gravity changes may facilitate a constant energy accumulation and the gradient belt may support seismic shear breakage.Overall,the gravity changes associated with the earthquake preparation indicate a pattern of accelerating increase-decelerating increase-earthquake occurrence.The Songpan-Ganzi block generally displays a negative gravity change,providing evidence for a local upwarping of the deep crust-mantle and an interior expansion of the deep crust attributable to high temperatures.The viewpoint is consistent with the dilatant mechanism for earthquake preparation. | Shen Chongyang Li Hui Sun Wenke Huang Jinshui Sun Shaoan Xuan Songbai Tan Hongbo Liu Shaoming | 2012 | Geodesy and Geodynamics2012，3，3： | 1 |
| 10 | Fast 3D joint inversion of gravity and magnetic data based on cross gradient constraint显示文摘The gravity and magnetic data can be adopted to interpret the internal structure of the Earth.To improve the calculation efficiency during the inversion process and the accuracy and reliability of the reconstructed physical property models,the triple strategy is adopted in this paper to develop a fast cross-gradient joint inversion for gravity and magnetic data.The cross-gradient constraint contains solving the gradients of the physical property models and performing the cross-product calculation of their gradients.The sparse matrices are first obtained by calculating the gradients of the physical property models derived from the first-order finite difference.Then,the triple method is applied to optimize the storages and the calculations related to the gradients of the physical property models.Therefore,the storage compression amount of the calculations related to the gradients of the physical property models and the cross-gradient constraint are reduced to one-fold of the number of grid cells at least,and the compression ratio increases with the increase of the number of grid cells.The test results from the synthetic data and field data prove that the structural coupling is achieved by using the fast cross-gradient joint inversion method to effectively reduce the multiplicity of solutions and improve the computing efficiency. | Sheng Liu Xiangyun Wan Shuanggen Jin Bin Jia Songbai Xuan Quan Lou Binbin Qin Rongfu Peng Dali Sun | 2023 | Geodesy and Geodynamics2023，14，4： | 0 |
| 11 | Joint inversion of gravity and vertical gradient data based on modified structural similarity index for the structural and petrophysical consistency constraint显示文摘Joint inversion is one of the most effective methods for reducing non-uniqueness for geophysical inversion.The current joint inversion methods can be divided into the structural consistency constraint and petrophysical consistency constraint methods,which are mutually independent.Currently,there is a need for joint inversion methods that can comprehensively consider the structural consistency constraints and petrophysical consistency constraints.This paper develops the structural similarity index(SSIM)as a new structural and petrophysical consistency constraint for the joint inversion of gravity and vertical gradient data.The SSIM constraint is in the form of a fraction,which may have analytical singularities.Therefore,converting the fractional form to the subtractive form can solve the problem of analytic singularity and finally form a modified structural consistency index of the joint inversion,which enhances the stability of the SSIM constraint applied to the joint inversion.Compared to the reconstructed results from the cross-gradient inversion,the proposed method presents good performance and stability.The SSIM algorithm is a new joint inversion method for petrophysical and structural constraints.It can promote the consistency of the recovered models from the distribution and the structure of the physical property values.Then,applications to synthetic data illustrate that the algorithm proposed in this paper can well process the synthetic data and acquire good reconstructed results. | Sheng Liu Xiangyun Wan Shuanggen Jin Bin Jia Quan Lou Songbai Xuan Binbin Qin Yiju Tang Dali Sun | 2023 | Geodesy and Geodynamics2023，14，5： | 0 |
| 12 | Effect of noncircularity on the dynamic behaviors of particles in a disformal rotating black-hole spacetime显示文摘A disformal rotating black-hole solution is a black-hole solution in quadratic degenerate higher-order scalar-tensor theories.It breaks the circular condition of spacetime different from the case of the usual Kerr spacetime.This study investigated the dynamic behaviors of the motion of timelike particles in such disformal black-hole spacetime with an extra deformation parameter.Results showed that the characteristics of the particle’s motion depend on the sign of the deformation parameter.For the positive deformation parameter,the motion is regular and orderly.For the negative one,as the deformation parameter changes,the motion of the particles undergoes a series of transitions between the chaotic motion and the regular motion and falls into the horizon or escapes to spatial infinity.This means that the dynamic behavior of timelike particles in the disformal Kerr black-hole spacetime with noncircularity becomes richer than that in the usual Kerr black-hole case. | Xuan Zhou Songbai Chen Jiliang Jing | 2022 | Science China(Physics,Mechanics & Astronomy)2022，65，5： | 0 |
| 13 | Influence of crustal layering and thickness on co-seismic effects of Wenchuan earthquake显示文摘Using the PSGRN/PSCMP software and the fault model offered by USGS and on the basis of finite rectangular dislocation theory and the local layered wave velocity structures of the crust-upper-mantle, the influences of crustal layering and thickness on co-seismic gravity changes and deformation of Wenchuan earthquake have been simulated. The results indicate that: the influences have a relationship with the attitude of faults and the relative position between calculated points and fault. The difference distribution form of simulated results between the two models is similar to that of co-seismic effect. For the per centum distribution, it's restricted by the zero line of the co-seismic effects obviously. Its positive is far away from the zero line. For the crustal thickness, the effect is about 10%-20%. The negative and the effect over 30% focus around the zero line. The average influences of crustal layering and thickness for the E-W displacement, N-S displacement, vertical displacement and gravity changes are 18.4%,18.0%,15.8% and 16.2% respectively,When the crustal thickness is 40 km, they are 4.6%,5.3%,3.8% and 3.8%. Then the crustal thickness is 70 km, the average influences are 3.5%, 4.6%,3.0% and 2.5% respectively. | Tan Hongbo Shen Chongyang Xuan Songbai Yang Guangliang | 2011 | Geodesy and Geodynamics2011，2，1： | 0 |
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