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| Titel |
Transformation of frequency-magnitude relation prior to large events in the model of block structure dynamics |
| VerfasserIn |
A. Soloviev |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 15, no. 1 ; Nr. 15, no. 1 (2008-02-27), S.209-220 |
| Datensatznummer |
250012565
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| Publikation (Nr.) |
 copernicus.org/npg-15-209-2008.pdf |
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| Zusammenfassung |
| 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. |
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