A project of creating atlas aftershocks of strong earthquakes

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Abstract

The Omori Law, which describes the repeated underground shocks after a strong earthquake, is written in the form of a nonlinear differential equation. An idea of the focal deactivation coefficient after the main shock is introduced. Two advantages of the new wording of the Omori Law are given. Firstly, there is an interesting possibility to naturally take into account exogenous and endogenous triggers affecting the earthquake source. Endogenous triggers in the form of round-the-world seismic echo and free oscillations of the Earth, excited by the main shock, are especially noted. The second advantage is that the differential aftershock equation makes it possible to put the reverse problem of the earthquake source physics. The essence of the inverse problem is to determine the deactivation coefficient from the data on the observed aftershock frequency. Examples of inverse problem solution are given. The project of creation of the Atlas of aftershocks on the basis of the solution of the inverse problem of the source, “cooling down” after a strong earthquake is offered.

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About the authors

A. V. Guglielmi

Institute of Physics of the Earth, Russian Academy of Sciences

Author for correspondence.
Email: zavyalov@ifz.ru
Russian Federation, Bol’shaya Gruzinskaya ul. 10, str. 1, Moscow, 123242

A. D. Zavyalov

Institute of Physics of the Earth, Russian Academy of Sciences

Email: zavyalov@ifz.ru
Russian Federation, Bol’shaya Gruzinskaya ul. 10, str. 1, Moscow, 123242

O. D. Zotov

Institute of Physics of the Earth, Russian Academy of Sciences

Email: zavyalov@ifz.ru
Russian Federation, Bol’shaya Gruzinskaya ul. 10, str. 1, Moscow, 123242

References

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2. Fig. 1. An example of solving the inverse problem. The event took place in Southern California 01/17/1994. The magnitude of the main strike is M = 6.7. Point “0” on the time axis corresponds to the moment of the main strike.

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3. Fig. 2. The variety of forms of evolution of the deactivation rate of the outbreak. In the upper right corner of each panel, the year, month and day of the main shock, the time of its occurrence (GMT), magnitude and the catalog used (NC - Northern California, SC - Southern California) are indicated.

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