New opportunities for the use of long-baseline hydrostatic levels for measuring some of the global (planetary) geophysical effects

Category: 16-2
A.B. Маnukin, O.S. Kazantseva, I.I. Kalinnikov, S.V. Bekhterev, V.I. Rebrov

UDC 528.546




A.B. Маnukin, O.S. Kazantseva, I.I. Kalinnikov, S.V. Bekhterev, V.I. Rebrov


Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, Moscow, Russia


Abstract. The article is devoted to the new opportunities of application of hydrostatic level functionalities application offered by a significant increase in the linear base of the instrument. It turns out that besides the classic problems of measuring tilts and deformations of the Earth surface, hydrostatic levels with a base of several kilometers can be used to obtain regional and global information about the Earth. Detailed analysis of three tasks is provided in the paper:  measurement of uneven rotation of the Earth within a day, measurement of possible small torsional motions of individual blocks of the lithosphere, measurement of small translational oscillations of the Earth's inner core at periods of a few hours. The main attention is paid to the potential of such a device. It is demonstrated that irregularity in angular velocity of the Earth’s rotation can be measured with relative precision of Dw/w = 5×10(-10)–5×10(–11) per 1000 sec and Dw/ω = 5×10(–9)–5×10(-10) per 10(4) sec, horizontal rotating shifts of lithosphere blocks can be measured with accuracy of 10(–4) sec for a period of 10(5) sec (day) and the amplitude of the translational oscillations of the Earth's inner core, which could be measured by hydrostatic leveling with a baseline of a few centimeters. The uniqueness of this tool opens a new area of its application and a new channel of obtaining information about the Earth.



Keywords: long-baseline hydrostatic level, method of measurement, dynamic range, global geophysical research, uneven rotation of the Earth, blocks of the lithosphere, translational oscillations of the inner core.


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