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Transformation of Frequency-magnitude Relation Prior to Large Events in the Model of Block Structure Dynamics : Volume 15, Issue 1 (27/02/2008)

By Soloviev, A.

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Book Id: WPLBN0003981065
Format Type: PDF Article :
File Size: Pages 12
Reproduction Date: 2015

Title: Transformation of Frequency-magnitude Relation Prior to Large Events in the Model of Block Structure Dynamics : Volume 15, Issue 1 (27/02/2008)  
Author: Soloviev, A.
Volume: Vol. 15, Issue 1
Language: English
Subject: Science, Nonlinear, Processes
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Soloviev, A. (2008). Transformation of Frequency-magnitude Relation Prior to Large Events in the Model of Block Structure Dynamics : Volume 15, Issue 1 (27/02/2008). Retrieved from

Description: International Institute of Earthquake Prediction Theory and Mathematical Geophysics, Russian Academy of Sciences, Moscow, Russia. The b-value change in the frequency-magnitude (FM) distribution for a synthetic earthquake catalogue obtained by means of the model of block structure dynamics has been studied. The catalogue is divided into time periods preceding strong earthquakes and time periods that do not precede strong earthquakes. The separate analysis of these periods shows that the b-value is smaller before strong earthquakes. The similar phenomenon has been found also for the observed seismicity of the Southern California. The model of block structure dynamics represents a seismic region as a system of perfectly rigid blocks divided by infinitely thin plane faults. The blocks interact between themselves and with the underlying medium. The system of blocks moves as a consequence of prescribed motion of the boundary blocks and of the underlying medium. As the blocks are perfectly rigid, all deformation takes place in the fault zones and at the block base in contact with the underlying medium. Relative block displacements take place along the fault zones. Block motion is defined so that the system is in a quasistatic equilibrium state. The interaction of blocks along the fault zones is viscous-elastic (normal state) while the ratio of the stress to the pressure remains below a certain strength level. When the critical level is exceeded in some part of a fault zone, a stress-drop (failure) occurs (in accordance with the dry friction model), possibly causing failure in other parts of the fault zones. These failures produce earthquakes. Immediately after the earthquake and for some time after, the affected parts of the fault zones are in a state of creep. This state differs from the normal state because of a faster growth of inelastic displacements, lasting until the stress falls below some other level. This numerical simulation gives rise a synthetic earthquake catalogue.

Transformation of frequency-magnitude relation prior to large events in the model of block structure dynamics

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