Tectonics
Khatoun Pirdadi; Maryam Agh-Atabai; Attieh Eshaghi
Abstract
The 2017 Ezgeleh earthquake (Mw: 7.3), which occurred in the northwest of the Zagros, was followed by many aftershocks. The histogram of the monthly rate of aftershocks shows that, except for the first few months, the aftershock sequence did not follow the Omori law. Therefore, it is necessary to use ...
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The 2017 Ezgeleh earthquake (Mw: 7.3), which occurred in the northwest of the Zagros, was followed by many aftershocks. The histogram of the monthly rate of aftershocks shows that, except for the first few months, the aftershock sequence did not follow the Omori law. Therefore, it is necessary to use more complex methods to investigate the aftershock sequence. In this research, the temporal multifractal method was used. The obtained results show that the temporal pattern of aftershocks has two short and long-scaling ranges. It seems that short and long ranges are related to the distribution of aftershocks within smaller clusters and the pattern of clusters in the aftershock sequence, respectively. These result showed that the pattern in the longer range is more heterogeneous than the shorter one. On the other hand, by removing the smaller aftershocks, the heterogeneity increases. It seems that the occurrence of several more significant aftershocks with a magnitude of more than 5 has caused an increase in the heterogeneity of the temporal pattern of the aftershock sequence. The results also show that the degree of inhomogeneity of the occurrence time of aftershocks is related to the spatial distribution pattern of aftershocks.
M Agh-Atabai
Abstract
In this paper, the properties of temporal distribution of earthquakes in southeast Zagros were studied using multifractal methods. To describe the multifractal characteristics of the occurrence time of events, the generalized correlation dimensions Dq and the singularity spectrum f(αq) were calculated ...
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In this paper, the properties of temporal distribution of earthquakes in southeast Zagros were studied using multifractal methods. To describe the multifractal characteristics of the occurrence time of events, the generalized correlation dimensions Dq and the singularity spectrum f(αq) were calculated for earthquake sequence with magnitudes equal to or larger than the completeness magnitude (M= 4.5). In order to investigation of the spatial variations of seismicity pattern, the study area is divided into the three subareas and the results of the analyses were compared to each other. The calculated multifractal spectra for all subareas indicate that the pattern of seismic activity in these regions is a heterogeneous multifractal phenomenon. However, the graphs of correlation integral functions of the studied subareas have clear differences. Except the transition zone on which there are three scaling ranges, the other subareas show two scaling ranges: short and long time scales. The properties of short time scale are controlled by the distributions of small earthquakes (e.g. aftershocks) in clusters, whereas the long time scale is related to the distribution of larger main earthquakes and the clusters related to them. In the graph of transition zone, the large time scale is divided into two different ranges with a characteristic break on about 3.6 years. This characteristic length means there is another kind of clusters (main shocks) rather than the small earthquake clusters. The graphs of recurrence time of earthquakes support these results and show the shorter recurrence time of events in the transition zone. In addition, the results show that the transition zone has a more heterogeneous multifractal pattern rather than its surroundings.
