GEOPHYSICAL RESEARCH, 2017, vol. 18, no. 1, pp. 20-36. DOI: 10.21455/gr2017.1-2

UDC 550.34.013.2

Abstract  References   Full text (in Russian)

TIME AND ENERGETIC PARAMETERS OF THE AFTERSHOCK PROCESS FOR THE EARTHQUAKES IN THE CAUCASUS AND ADJACENT AREAS

© 2017 A.I. Lutikov(1,2), G.Yu. Dontsova(2), S.N. Rodina(1)

(1) Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, Moscow, Russia

(2) Geophysical Survey, Russian Academy of Sciences, Moscow, Russia

Abstract. Based on the analysis of aftershock sequences of 23 strong and moderate (5.1≤MW≤7.1) earthquakes of the Caucasus and adjacent areas, the duration of the aftershock process Taft and the total scalar seismic moment M0aft released during it were estimated. Parameters M0aft и Taft were selected according to the criteria proposed and were used in the development of the regression relationships. The significant correlation between these parameters and the moment magnitude of the main shock was revealed. The empirical Bath’s law was tested for the set of the earthquakes considered and demonstrated its validity on average. However, the difference between the magnitudes of the main shock and the strongest aftershock ΔM is significant; if the double events are excluded, 0.4≤DM≤1.8.

Earlier, in 2013, we conducted the similar study for the earthquakes in the Kurile-Kamchatka region. The results obtained for two seismically active regions lead to the conclusion that relative intensity and duration of the aftershock process are inversely proportional to seismic activity of the territory considered, which means that relaxation processes accompanying strong seismic events display longer duration and higher intensity in the regions of lower seismic activity.

This conclusion can be regarded as preliminary because it should be tested for other seismically active regions.

Keywords: earthquakes, aftershock sequences, scalar seismic moment, duration of the aftershock process, the Caucasus.

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