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| Titel |
Nonextensive characteristics of earthquakes magnitude distribution in Javakheti region, Georgia |
| VerfasserIn |
Tamaz Chelidze, Teimuraz Matcharashvili, Nato Jorjiashvili, Zurab Javakhishvili |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250035746
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| Zusammenfassung |
| For last several years nonextensive statistical mechanics is increasingly used to study wide
range of complex phenomena exhibiting the scale free nature in different domains.
It is assumed that nonextensivity concepts may provide a suitable framework to
shed new light on features of spatiotemporal and energetic behavior of seismic
processes which presently are not fully understood. In present research we studied
cumulative distribution of earthquakes magnitudes in Caucasus from both common
and nonextensive statistical mechanics point of views. Data sets of earthquakes
magnitudes from 1960 to 1991 have been compiled from data bases of Seismic
Monitoring Center at Ilia State University in Georgia. Javakheti Region in Southern
Georgia was selected based on its geological structure and high seismic activity; exact
time interval was specified because of increased seismic activity in Caucasus for
that period. Together with common seismic characteristics such as a andbvalues of
Gutenberg-Richter relationship, we evaluated nonextensive characteristics in the framework
of earthquakes fragment-asperity interaction model. Namely nonextensive parameter qand
energy density value a were calculated. All these characteristics have been assessed
for the whole observation period as well as for consecutive 10 year overlapping
sliding windows. It was observed that calculated nonextensive characteristics both
for whole catalogue and for sliding windows (q=1.6-1.83) are close to the range
found earlier for other regions. At the same time we see that bothaandq values vary
in the investigated period, for consecutive sliding windows. These changes are
statistically significant and obviously are related to the earthquake generation process of
Javakheti region. Indeed, it was observed that nonextensivity parameter increases
according to local seismic activity, which may point to the increase of functional
relationship between above parameters prior and during earthquake generation. At
the same time energy density value a, which is assumed to be related with spatial
distribution, decreases after strongest event for the considered time period. These
results point to increased long range correlations of seismic process in energetic
and spatial domains prior and during strongest regional earthquakes. Results of
nonextensive analysis are in good accordance with b value analysis. After strongest event b
value increases and a decreases that is consistent with a physical meaning of these
parameters.
Results of our research supports assumption that nonextensive statistics can provide a
new promising approach to earthquakes distribution features in different domains. |
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