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Doklady Earth Sciences - The results of studying the structural features of an anomalous magnetic field and modeling sources in the Earth’s crust of the Middle Ural region are presented. A... 相似文献
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P. S. Martyshko I. V. Ladovskij D. D. Byzov A. I. Chernoskutov 《Izvestiya Physics of the Solid Earth》2018,54(4):565-573
Correcting the effects of the sphericity of the Earth in the results of the interpretation of gravimetric data is a topical issue in modern gravimetry. Estimating the error of the gravity field calculations due to the replacement of the spherical Earth model by the plane model is an important part of this problem. In this paper, a method is proposed for transforming the plane density models into spherical ones and vice versa. Algorithms for calculating the vertical component of gravity field for both model types are presented. For two extensive plane models of the Earth’s density, their transformation into spherical models is carried out and the resulting gravity fields are compared. The relative root mean square residuals between the fields calculated with this replacement are at most 5%. 相似文献
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P. S. Martyshko I. V. Ladovskii A. G. Tsidaev 《Izvestiya Physics of the Solid Earth》2010,46(11):931-942
The technique of solving the inverse structural gravity problem based on the joint interpretation of gravity and seismic data
is described in this paper. The method of solving is based on the method of local corrections, but involves some modifications
described in the paper. An area of the northeastern part of the Urals and West Siberia (60°-65°N, 54°-72°E) was studied with
the use of this technology and the spatial position of the boundaries of the crystalline crust of the Earth (its roof K0 and base M) were determined from seismic and gravity data. 相似文献
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P. S. Martyshko E. N. Akimova V. E. Misilov 《Izvestiya Physics of the Solid Earth》2016,52(5):704-708
New methods for solving the three-dimensional inverse gravity problem in the class of contact surfaces are described. Based on the approach previously suggested by the authors, new algorithms are developed. Application of these algorithms significantly reduces the number of the iterations and computing time compared to the previous ones. The algorithms have been numerically implemented on the multicore processor. The example of solving the structural inverse gravity problem for a model of four-layer medium (with the use of gravity field measurements) is constructed. 相似文献
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A. K. Troyanov P. S. Martyshko A. K. Yurkov B. P. Dyakonov Yu. G. Astrakhantsev N. I. Nachapkin I. A. Kozlova E. A. Bazhenova A. G. Vdovin 《Doklady Earth Sciences》2012,445(1):893-896
Measurements of seismoacoustic emissions in boreholes allow researchers to identify fault zones and zones of cracking and rock shattering. These zones are usually identified from the maximal values of seismoacoustic emission. However, the permeability of the identified zones cannot be estimated solely from the seismoacoustic emission data, especially in the case when seismoacoustic emission sources are located in isolation in the vicinity of a borehole. The experiments have shown that dynamically active permeable zones of tectonic failures can be identified based on joint measurements of seismoacoustic emissions and helium concentrations in fluid. 相似文献
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T.A. Sherendo P.S. Martyshko V.P. Moloshag A.A. Garaeva D.A. Zamyatin V.Ya. Mitrofanov L.A. Pamyatnykh 《Russian Geology and Geophysics》2012,53(9):853-860
The microstructure and magnetic properties of accessory Fe–Cr-spinels from the Kytlym massif of the Urals platinum-bearing belt were studied. Atypical Fe–Cr-spinels in the form of magnetic microareas in grains of primary nonmagnetic Fe–Cr-spinel have been revealed for the first time in the bed dunites of the Kytlym multiphase concentrically zoned massif, North Urals. These spinels are responsible for the magnetic properties of the dunites. It has been established that the microareas are separations in solid solution Fe2+(Cr2–xFex3+)O4, which are enriched in Fe3 + and are probably an intermediate product of the transformation of primary accessory Fe-Cr-spinel during the formation of the dunite massif. These are magnetic microphases with particular chemical composition, cation distribution, and corresponding reversed crystal lattice, which determine the main magnetic properties of the microarea: the magnitude and direction of magnetization vector and Curie temperature. The formation of this earlier unknown type of magnetic Fe–Cr-spinel is probably conjugate with the formation and concentration of PGE mineralization in the bed dunites of the Kytlym platinum-bearing massif. The presence of such magnetization carriers in rocks and ores must be taken into account in geophysical research at the Urals chromite and platinum–chromite deposits. 相似文献
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A method for interpretation of potential geophysical fields, based on a stable inversion algorithm, is proposed. The stability of the algorithm is provided by an original choice of the zero approximation model and stepwise solution of the inverse problem by a correctness set. The three-dimensional density distribution of local structures as grid functions is reconstructed by layer-wise anomalies of a spilt field. Examples of interpretation of the practical gravimetric data illustrating the efficiency of the method are given.
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A method for transformation of the three-dimensional regional “flat” density models of the Earth’s crust and upper mantle to the “spherical” models and vice versa is proposed. A computation algorithm and a method of meaningful comparison of the vertical component of the gravity field of both models are presented. 相似文献