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| 1 | Recent gravity changes in China Mainland显示文摘Based on results of the mobile gravity measurements of the Crustal Movement Observation Network of China and Digital Earthquake Observation Network of China, this paper shows the pattern of temporal gravity changes in China mainland on a time scale of 2-3 years since 1998, and gives an analysis of the patterns. The result shows that the temporal gravity changes basically reflect the current mass movement and occurrence of strong earthquakes. | Li Hui Shen Chongyang Sun Shaoan Wang Xiaoquan Xiang Aimin Liu Shaoming | 2011 | Geodesy and Geodynamics2011，2，1： | 7 |
| 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 | 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 |
| 4 | Study on Evolution of Gravity Fieldand Earthquake Prediction in theNorth-south Seismic Belt and theEastern Qinghai-Xizang Block显示文摘The relation between the dynamic evolution feature of gravity field and strong seismicity is studied. The result shows that the regional gravity field variation enjoys inhomogeneity of spatial and temporal distribution and gravity change in different regions. It may be resulted from active faults and seismogenic process, and may be due to microdynamic activity of regional strain energy, which might be accumulated or released in different stages, and there exists transformation process of stress. | Zhu Yiqing,Jiang Zaisen and Chen Bing,Li Hui, Sun Shaoan,and Xiang AimingSecond Crustal Deformation Monitoring Center, CSB, Xi’an 710054, China Institute of Seismology, CSB, Wuhan 430071, China | 2001 | Earthquake Research in China2001，15，3： | 3 |
| 5 | Characteristics of gravity fields in the Jinggu M6. 6 earthquake显示文摘Based on the study of high-precision gravity data obtained from recent studies and the regional gravity network for Yunnan province,a variation in the regional gravity field was identified before the occurrence of the Yunnan Jinggu M6. 6 earthquake. | Sun Shaoan Hao Hongtao Wei Jin | 2014 | Geodesy and Geodynamics2014，5，4： | 2 |
| 6 | Joint inversion of gravity and seismic data along a profile across the seismogenic fault of 2010 Yushu Ms7. 1 earthquake显示文摘Yushu Ms7. 1 earthquake occurred on the Ganzi-Yushu fault zone,across which we carried out a joint relative-gravity and seismic-reflection survey,and then performed a gravity inversion constrained by the seismic-reflection result. Based on the data of complete Bouguer gravity anomaly and seismic reflection,we obtained a layered interface structure in deep crust down to Moho. Our study showed that the inversion could reveal the interfaces of strata along the survey profile and the directions of regional faults in two-dimension. From the characteristics of the observed topography of the Moho basement,we tentatively confirmed that the uplift of eastern edge of Qinghai-Tibet plateau was caused by the subduction of the Indian plate. | Yang Guangliang Wang Fuyun Shen Chongyang Sun Shaoan Tan Hongbo | 2011 | Geodesy and Geodynamics2011，2，4： | 2 |
| 7 | Gravity anomaly before the Leshan M5.0 earthquake?显示文摘The NortheSouth Seismic Belt was analyzed using gravity observation data from 2011 to2015, and the nontidal analysis results show that there was a nonlinear gravity change at both the Chengdu and Guza seismostations one month before the Leshan M5.0 earthquake. | Wei Jin Liu Ziwei Sun Shaoan Kang Kaixuan Shen Chongyang Li Hui | 2015 | Geodesy and Geodynamics2015，6，2： | 1 |
| 8 | Gravity inversion of deep-crust and mantle interfaces in the Three Gorges area显示文摘To better understand the heterogeneity of deep-crust and mantle interfaces in the region of the Three Gorges, China, we used the Parker-Oldenburg iterative inversion method to invert existing Bouguer gravity data from the Three Gorges area (1 ∶500000), a new gravity map of the Three Gorges Dam (1 ∶200000), and the results of deep seismic soundings. The inversion results show a Moho depth of 42 km between Badong and Zigui and the depth of the B2 lower-crustal interface beneath the Jianghan Plain and surrounding areas at 21-25 km. The morphology of crustal interfaces and the surface geology present an overpass structure. The mid-crust beneath the Three Gorges Dam is approximately 9 km thick, which is the thinnest in the Three Gorges area and may be related to the shallow low-density body near the Huangling anticline. The upper crust is seismogenic, and there is a close relationship between seismicity and the deep-crust and mantle interfaces. For example, the M5.1 Zigui earthquake occurred where the gradients of the Moho and the B2 interface are the steepest, showing that deep structure has a very important effect on regional seismicity. | Wang Jian Shen Chongyang Li Hui Sun Shaoan Xing Lelin | 2012 | Geodesy and Geodynamics2012，3，4： | 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 | Gravity change observed in a local gravity network and its implication to seasonal precipitation in Dali county, Yunnan province, China显示文摘This study investigates data-processing methods and examines the precipitation effect on gravity measurements at the Dali gravity network, established in 2005. High-quality gravity data were collected during four measurement campaigns. To use the gravity data validly, some geophysical corrections must be considered carefully. We first discuss data-processing methods using weighted leastsquares adjustment with the constraint of the absolute gravity datum. Results indicate that the gravity precision can be improved if all absolute gravity data are used as constraints and if calibration functions of relative gravimeters are modeled within the observation function. Using this data-processing scheme, the mean point gravity precision is better than 12 lgal. After determining the best data-processing scheme, we then process the gravity data obtained in the four measurement campaigns, and obtain gravity changes in three time periods. Results show that the gravity has a remarkable change of more than 50 lgal in the first time period from Apr–May of 2005 to Aug–Sept of 2007. To interpret the large gravity change, a mean water mass change(0.6 m in height) is assumed in the ETOPO1 topographic model. Calculations of the precipitation effect on gravity show that it can reach the same order of the observed gravity change. It is regarded as a main source of the remarkable gravity change in the Dali gravity network, suggesting that the precipitation effect on gravity measurements must be considered carefully. | Xin Zhou Wenke Sun Hui Li Shuhei Okubo Shaoan Sun Lelin Xing Dongzhi Liu Chongyang Shen | 2014 | Earthquake Science2014，27，1： | 0 |
| 11 | Analysis of datum-instability effect on calculated results of data from Longmen Mountain regional gravity network显示文摘A statistical correlation method is used to study the effect of instability of the calculation datum ( used in traditional method of indirect adjustment) on calculated gravity results,using data recorded by Longmen Mountain regional gravity network during 1996 - 2007. The result shows that when this effect is corrected,anomalous gravity changes before the 2008 Wenchuan Ms8. 0 earthquake become obvious and characteristically distinctive. Thus the datum-stability problem must be considered when processing and analyzing data recorded by a regional gravity network. | Sun Shaoan Zhou Xin | 2011 | Geodesy and Geodynamics2011，2，4： | 0 |
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