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- Title
Temporal variations of seismicity parameters in the Central Alborz, Iran.
- Authors
Agh-Atabai, Maryam; Mirabedini, Maryam
- Abstract
Temporal changes of b-value, fractal (correlation) dimensions of epicenters ( D) and occurrence time of earthquakes ( D) and relations between these parameters were calculated to investigate precursory changes before 28 May 2004, Baladeh-Kojour earthquake ( M = 6.3) of Central Alborz, Iran. 2086 events with M ≥ 1.7 were selected for our analyses. A wide range of variation was seen in these parameters: b-value ∼ 0.6-1.11, D ∼ 0.97-1.64, and D ∼ 0.13-0.93. The results showed decreases in all fractal parameters several months before the main shock. This decrease, which might have arisen due to clusters of events occurred between 2002-2003, was followed by a systematic increase, corresponding to the increased level of low-magnitude seismicity. It seems that changes in fractal parameters may be precursors of Baladeh-Kojour earthquake which was caused by seismic activation and quiescence. Furthermore, a positive correlation between b-value and D was detected before the main shock ( D = 0.87 + 0.7 b) and during aftershock sequences ( D = 2 b ± 0.09), which was further on changed to a negative one ( D = 2.56-1.32 b).
- Subjects
ALBORZ-e-Markazi Protected Area (Iran); SPATIO-temporal variation; FRACTAL dimensions; EARTHQUAKES; PARAMETERS (Statistics); FRACTAL analysis
- Publication
Acta Geophysica, 2014, Vol 62, Issue 3, p486
- ISSN
1895-6572
- Publication type
Article
- DOI
10.2478/s11600-013-0172-7