The sum of the dissipative energy and energy constant of the GOCE satellite is found by a priori gravity field model at first, and the GOCE dissipative energy is obtained by computing the adjacent epoch difference via...The sum of the dissipative energy and energy constant of the GOCE satellite is found by a priori gravity field model at first, and the GOCE dissipative energy is obtained by computing the adjacent epoch difference via the differential method. Then, a gravity field model GOCE-ECPO1, which up to the degree and order 80, is recovered by the energy conservation approach from the 103-day precise orbital data of the GOCE satellite collected from November 1, 2009 to January 12, 2010. Finally, the model is compared with existing models EGM96, ITG-CHAMP05S, EIGEN-GRACE2010S, EIGEN-6C and GO CONS GCF 2 DIR_R3. The results show that at the same order and degree, the accuracy of model GOCE-EBPO1 is higher than those of models EGM96 and ITG-CHAMP05S, but lower than those of models EIGEN-GRACE2010S, EIGEN-6C and GO_CONS_GCF 2 DIR_R3, which is mainly caused by the pole gap.展开更多
Gravity data are sensitive to local vertical offsets across high-angle faults, where rocks with different densities are juxtaposed. Yet high densities in some Mesozoic sedimentary rocks just above the basement may sme...Gravity data are sensitive to local vertical offsets across high-angle faults, where rocks with different densities are juxtaposed. Yet high densities in some Mesozoic sedimentary rocks just above the basement may smear out the subtle gravity signatures of basement faults. At this study the gravity data processing tends to avoid ill-described “black-box” techniques. The study area is situated in the Palomas site, Cuatrociénegas region, Coahuila, NE Mexico. The San Marcos Fault is at least 300 km long and has WNW-ESE trend from the central part of Nuevo León State through Coahuila, and finally to the eastern part of Chihuahua State. Gravimetric data shows that the lowest values of free air and Bouguer anomalies are in the southern part of the area, and the highest values are in the western and central part of the area. Between these parts exists a zone of high horizontal gravity gradient. Configuration of linear elements of gravity field (gradient zones) delimited the San Marcos Fault in the San Marcos valley below thickness of recent sedimentary cover. Two density models were carried out, which showed that the Cretaceous rocks are in discordant contact with the Paleo- zoic rocks that can be related to the San Marcos Fault. The density was determinate using to Nettleton’s method, which results highlight the presence of the San Marcos Fault. Density models showed that the Quaternary sediments are in direct contact with the San Marcos Fault.展开更多
Due to the complexity and overlap effects of gravity anomalies,the gravity high point always deviates from the real position of the target.Researching the offset characteristics is helpful to determine the right locat...Due to the complexity and overlap effects of gravity anomalies,the gravity high point always deviates from the real position of the target.Researching the offset characteristics is helpful to determine the right location of gravity anomalies.In this paper,a series of forward models were designed to calculate the offset features under different assumptions.Different density models were established based on the measured gravity data in north China Sunhu area and a variety of methods were tried to eliminate offset effects under different conditions.The results indicate that the gravity anomalies of different density bodies can be separated effectively and the real position of target can be correctly located by using the“layer stripping method”.展开更多
GRACE(Gravity Recovery And Climate Experiment)重力测量卫星自2002年3月发射以来,已经提供了地球重力场十多年的观测资料,该卫星通过测量全球不同地区因质量异常所引起的重力起伏来获取陆地水储量变化的总体分布信息,为监测表层或深...GRACE(Gravity Recovery And Climate Experiment)重力测量卫星自2002年3月发射以来,已经提供了地球重力场十多年的观测资料,该卫星通过测量全球不同地区因质量异常所引起的重力起伏来获取陆地水储量变化的总体分布信息,为监测表层或深层水储量变化提供了新方法。系统综述了利用GRACE卫星重力数据进行水储量变化研究的国内进展,重点介绍了GRACE重力卫星及其在国内湖泊流域、河流流域和高原冰川等区域水储量变化反演的研究,并从气候因子和人口社会经济因子分析了我国水储量变化的特点,同时还探讨了GRACE在研究我国水资源储量中的技术瓶颈、可能的解决方案和未来展望。展开更多
基金supported by the Fundamental Research Funds for the Central Universities(SWJTU12BR012)
文摘The sum of the dissipative energy and energy constant of the GOCE satellite is found by a priori gravity field model at first, and the GOCE dissipative energy is obtained by computing the adjacent epoch difference via the differential method. Then, a gravity field model GOCE-ECPO1, which up to the degree and order 80, is recovered by the energy conservation approach from the 103-day precise orbital data of the GOCE satellite collected from November 1, 2009 to January 12, 2010. Finally, the model is compared with existing models EGM96, ITG-CHAMP05S, EIGEN-GRACE2010S, EIGEN-6C and GO CONS GCF 2 DIR_R3. The results show that at the same order and degree, the accuracy of model GOCE-EBPO1 is higher than those of models EGM96 and ITG-CHAMP05S, but lower than those of models EIGEN-GRACE2010S, EIGEN-6C and GO_CONS_GCF 2 DIR_R3, which is mainly caused by the pole gap.
文摘Gravity data are sensitive to local vertical offsets across high-angle faults, where rocks with different densities are juxtaposed. Yet high densities in some Mesozoic sedimentary rocks just above the basement may smear out the subtle gravity signatures of basement faults. At this study the gravity data processing tends to avoid ill-described “black-box” techniques. The study area is situated in the Palomas site, Cuatrociénegas region, Coahuila, NE Mexico. The San Marcos Fault is at least 300 km long and has WNW-ESE trend from the central part of Nuevo León State through Coahuila, and finally to the eastern part of Chihuahua State. Gravimetric data shows that the lowest values of free air and Bouguer anomalies are in the southern part of the area, and the highest values are in the western and central part of the area. Between these parts exists a zone of high horizontal gravity gradient. Configuration of linear elements of gravity field (gradient zones) delimited the San Marcos Fault in the San Marcos valley below thickness of recent sedimentary cover. Two density models were carried out, which showed that the Cretaceous rocks are in discordant contact with the Paleo- zoic rocks that can be related to the San Marcos Fault. The density was determinate using to Nettleton’s method, which results highlight the presence of the San Marcos Fault. Density models showed that the Quaternary sediments are in direct contact with the San Marcos Fault.
基金National Natural Science Foundation of China(41674107,41874119,41574064)National Key Research and Development Program of China(2017YFB0202904).
文摘Due to the complexity and overlap effects of gravity anomalies,the gravity high point always deviates from the real position of the target.Researching the offset characteristics is helpful to determine the right location of gravity anomalies.In this paper,a series of forward models were designed to calculate the offset features under different assumptions.Different density models were established based on the measured gravity data in north China Sunhu area and a variety of methods were tried to eliminate offset effects under different conditions.The results indicate that the gravity anomalies of different density bodies can be separated effectively and the real position of target can be correctly located by using the“layer stripping method”.
文摘GRACE(Gravity Recovery And Climate Experiment)重力测量卫星自2002年3月发射以来,已经提供了地球重力场十多年的观测资料,该卫星通过测量全球不同地区因质量异常所引起的重力起伏来获取陆地水储量变化的总体分布信息,为监测表层或深层水储量变化提供了新方法。系统综述了利用GRACE卫星重力数据进行水储量变化研究的国内进展,重点介绍了GRACE重力卫星及其在国内湖泊流域、河流流域和高原冰川等区域水储量变化反演的研究,并从气候因子和人口社会经济因子分析了我国水储量变化的特点,同时还探讨了GRACE在研究我国水资源储量中的技术瓶颈、可能的解决方案和未来展望。
