Earth’s gravity ― the reason of earthquakes

Authors

  • S. V. Mishin Far Eastern Branch of the Russian Academy of Sciences, Russian Federation
  • A. A. Panfilov Far Eastern Branch of the Russian Academy of Sciences, Russian Federation
  • I. M. Hasanov Far Eastern Branch of the Russian Academy of Sciences, Russian Federation

DOI:

https://doi.org/10.24028/gzh.0203-3100.v41i6.2019.190079

Keywords:

earthquake, seismic radiation, weight, momentum, energy

Abstract

In the paper, an attempt has been made to describe seismic processes by means of classical mechanics. Dynamic parameters such as energy, impulse, and forces that determine the movement of masses are estimated.

An earthquake model is regarded with consideration of the Earth gravity field influence on distribution of masses composing the Earth crust. The Earth crust is considered as a complex of geological bodies which is ordered by the planets gravity field. Due to isostasy the difference in density of the equal matter volumes leads to formation of mountain structures specific for the surface. When a base of such structures collapses a rock block shifts down and acquires mechanical impulse. Authors assume that this acquired mechanical impulse determines the earthquake’s magnitude.

Impulse propagates in medium as a seismic wave. Front of the wave generates pressure effected on an environment that is not active yet. It determines macro-processes of the earthquake measured as earthquake intensity. Authors consider mass (weight) of a rocks block, magnitude (mechanical impulse acquired during an impact), seismic emission, which is a distribution of a momentum and a pressure of wave front (product of impulse by time), as parameters of a seismic process. To estimate dynamic parameters of earthquake processes, such as shifted mass, mechanical impulse, pressure of wave front, a nomogram is presented. Magnitude of a seismic event has dimension of a mechanical impulse, seismic intensity (earthquake intensity) has a dimension of pressure. Nomogram consists of several parts. The first one, allows analyzing the source of the emission. It shows the relation between emitted momentum, mass of a shifted body and energy. The next part of the nomogram represents momentum density per unit of area of the wavefront, which decreases in proportion to the square of a distance from the source. It characterizes the spherical propagation of seismic radiation in an isotropic medium. The third part of the nomogram helps to estimate the value of an average seismic pressure of the wavefront. The last part of the nomogram allows rating the empirical characteristics of a seismic event. A relation between a scale of seismic pressure and standardized scale of seismic intensity MSK-64 is established. As an example a Spitaka earthquake, December 7th, 1988, was analyzed.

References

Aki, K., & Richards, P. (1983). Quantitative Seismology. Moscow: Mir, 336 p. (in Russian).

Bridgman, P. (1955). Studies of large plastic deformations and fracture. Moscow: Foreign Literature Publ. House, 444 p. (in Russian).

Genkin, M. D. (Ed.). (1981). Vibration in technology. Handbook in 6 volumes. Vol. 5. Measurements and tests. Moscow: Mashinostroyeniye, 496 p. (in Russian).

Vorobiev, A. A. (1974). Physical conditions of occurrence of deep matter and seismic phenomena. In 2 volumes. Tomsk: Publ. House of Tomsk State University (in Russian).

Gedakyan, E. G., Golinskiy, G. L., & Papalashvili, V. G. (1991). Spitak earthquake of December 7, 1988. Isoseist maps. In Earthquakes in the USSR in 1988 (pp. 74―86). Moscow: Nauka (in Russian).

Gorshkov, G. P. (1984). Regional seismotectonics of the south of the USSR. Alpine belt. Moscow: Nauka, 272 p. (in Russian).

Dmitriev, A. P., Kuzyaev, L. S., Protasov, Yu. I., & Yamshchikov, V. S. (1969). Physical properties of rocks at high temperatures. Moscow: Nedra, 160 p. (in Russian).

Kondorskaya, N. V., Vandysheva, N. V., & Zakharova, A. I. Spitak earthquake of December 7, 1988. Instrumental data. In Earthquakes in the USSR in 1988 (pp. 60―74). Moscow: Nauka (in Russian).

Kostrov, B. V. (1975). The mechanics of the source of a tectonic earthquake. Moscow: Nauka, 172 p. (in Russian).

Mishin, S. V. (2016). About experiments in seismology. Sodruzhestvo, (3), 105―109 (in Russian).

Mishin, S. V. (2013). About the physics of seismic processes. Experiments and models. Lambert Academic Publishing, 196 p. (in Russian).

Mishin, S. V., & Khasanov, I. M. (2015). About the physics of seismic processes. Geofizika, (4), 73―80 (in Russian).

Pevnev, A. K. (2003). Ways to practical earthquake prediction. Moscow: GEOS, 152 p. (in Russian).

Ramberg, H. (1985). Gravity and strain in the earth’s crust. Moscow: Nedra, 399 p. (in Russian).

Salnikov, A. S., Staroseltsev, V. S., & Sobolev, P. N. (2014). Report on the results of work on the object «Creation of a reference geological and geophysical profile 3 Far East (North-Eastern section)». Rosgeolfond TFGI in the Far Eastern Federal District (in Russian).

Churinov, M. V. (Ed.). (1974). Handbook of engineering geology. Moscow: Nedra, 408 p. (in Russian).

Published

2019-12-26

How to Cite

Mishin, S. V., Panfilov, A. A., & Hasanov, I. M. (2019). Earth’s gravity ― the reason of earthquakes. Geofizicheskiy Zhurnal, 41(6), 213–222. https://doi.org/10.24028/gzh.0203-3100.v41i6.2019.190079

Issue

Section

Scientific Reports