The effect of baric disturbances in the atmosphere on microseismic processes in the crust     

V. V. Adushkin  D. N. Loktev  A. A. Spivak 《Izvestiya Physics of the Solid Earth》2008,44(6):510-517

The effect of baric variations of different origins on characteristics of seismic noise is analyzed in the frequency range 0.03–20 Hz. Long period variations in atmospheric pressure caused by cyclones, whose period T ranges from half a day to a few days, are shown to increase the microseismic background amplitude by two to four times in the frequency range 0.03–1 Hz (the coefficient of linear correlation between time variations in the amplitude and atmospheric pressure is K = 0.65 at a significance level of r = 0.95). Short-period baric variations with T ～ 5–30 min associated with the passage of cold fronts lead to a tenfold increase in the microseismic background amplitude in the frequency range 4–8 Hz (K = 0.67 at r = 0.95). In this case, disturbances of seismic background are recorded for 20–60 min after the passage of an atmospheric front and display an exponential drop in the amplitude. In distinction to cyclones, an atmospheric front increases the number of impulsive microseismic events of the resonance type.  相似文献   

Raman study of MgCO3–FeCO3 carbonate solid solution at high pressures up to 55 GPa     

Anna Spivak  Natalia Solopova  Valerio Cerantola  Elena Bykova  Egor Zakharchenko  Leonid Dubrovinsky  Yuriy Litvin 《Physics and Chemistry of Minerals》2014,41(8):633-638

Magnesite, siderite and ferromagnesites Mg_1?x Fe _x CO₃ (x = 0.05, 0.09, 0.2, 0.4) were characterized using in situ Raman spectroscopy at high pressures up to 55 GPa. For the Mg–Fe-carbonates, the Raman peak positions of six modes (T, L, ν₄, ν₁, ν₃ and 2ν₂) in the dependence of iron content in the carbonates at ambient conditions are presented. High-pressure Raman spectroscopy shows that siderite undergoes a spin transition at ~40 GPa. The examination of the solid solutions with compositions Mg_0.6Fe_0.4CO₃, Mg_0.8Fe_0.2CO₃, Mg_0.91Fe_0.09CO₃ and Mg_0.95Fe_0.05CO₃ indicates that with increase in the amount of the Fe spin transition pressure increases up to ~45 GPa.  相似文献   

Structure and Variability of the Lena River Plume in the South-Eastern Part of the Laptev Sea     

Spivak  E. A.  Osadchiev  A. A.  Semiletov  I. P. 《Oceanology》2021,61(6):839-849

Oceanology - This work is focused on structure and seasonal variability of the most freshened part of the Lena plume in the south-eastern part of the Laptev Sea, namely, at sea area adjacent to the...  相似文献   

Microseismicity and intensity of relaxation processes in the earth’s crust     

V. V. Adushkin  A. A. Spivak 《Doklady Earth Sciences》2006,408(4):671-673

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Variation in fracture zone rigidity by dynamic effects     

A. A. Spivak  V. M. Khazins 《Doklady Earth Sciences》2013,449(1):328-331

The coefficient of normal rigidity of different-order fault zones was evaluated from seismic data. The crust tectonic faults were shown to be dynamic systems and nonstatic. Specifically, this is manifested in the variability of their rigidity with time. The value of the rigidity of fault zones varies in time with periods of 13–15 days, 27–32 days, and around 1 year. Here, the coefficient of normal rigidity of different-order fault zones can vary by 1.3 (semimonthly variations) 1.5 (monthly variations), and 2.5 times (annual variations), respectively. These variations are most likely governed by the rate and intensity of the transformation of matter of fault zones and, as a consequence, the variations in their mechanical properties under tidal conditions. Dynamic effects like seismoexplosive waves lead to a reduction in the rigidity of fault zones by 5–50% depending on the amplitude of the compression wave.  相似文献   

The Geomagnetic Effect of Earthquakes     

Spivak  A. A.  Riabova  S. A. 《Doklady Earth Sciences》2019,488(1):1107-1110

Doklady Earth Sciences - Based on the results of instrumental observations carried out at a number of mid-latitude observatories of the INTERMAGNET network and at the Mikhnevo Geophysical...  相似文献   

Interpretation of a deep electromagnetic sounding of the ocean floor near the Californian coast     

L.L. Van&#x;yan  E.P. Kharin  I.L. Osipova  V.A. Spivak 《Physics of the Earth and Planetary Interiors》1976,13(2):119-122

Amplitude and phase curves of magnetotelluric (MTS) and gradient magneto-variational (MVS) soundings in the period range 0.5–24 h obtained by Cox, Filloux and Larsen are interpreted. After some corrections the results of both kinds of sounding are practically the same. These results indicate high-conductivity oceanic asthenosphere at the 70–170-km depths.  相似文献   

Seismic,Atmospheric-Wave,Electrical, and Magnetic Effects of Powerful Atmospheric Fronts     

Spivak  A. A.  Ovtchinnikov  V. M.  Rybnov  Yu. S.  Riabova  S. A.  Kharlamov  V. A. 《Izvestiya Physics of the Solid Earth》2022,58(4):493-506

Izvestiya, Physics of the Solid Earth - Abstract—Disturbances of seismic noise, magnetic field, electrical characteristics of the surface atmosphere and microbaric variations caused by the...  相似文献   

Interaction of Kimberlite Magma with Diamonds Upon Uplift from the Upper Mantle to the Earth’s Crust     

Yu. A. Litvin  A. V. Kuzyura  D. A. Varlamov  A. V. Bovkun  A. V. Spivak  V. K. Garanin 《Geochemistry International》2018,56(9):881-900

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Atmospheric Pressure Variations Induced by the Tohoku Earthquake     

Shalimov  S. L.  Spivak  A. A.  Kharlamov  V. A. 《Doklady Earth Sciences》2020,490(1):28-30

Doklady Earth Sciences - The response of atmospheric pressure to the Tohoku earthquake on February 11, 2011 (magnitude M ~ 9), is analyzed using the results of instrumental observations made at the...  相似文献