Temporal variations of seismicity parameters in the Central Alborz, Iran

• Autorzy: Agh-Atabai M. , Mirabedini M.S.
• Języki publikacji: EN

Abstrakty

EN

Temporal changes of b-value, fractal (correlation) dimensions of epicenters (De) and occurrence time of earthquakes (Dt) and relations between these parameters were calculated to investigate precursory changes before 28May 2004, Baladeh-Kojour earthquake (Mw = 6.3) of Central Alborz, Iran. 2086 events with MN ≥ 1.7 were selected for our analyses. A wide range of variation was seen in these parameters: b-value ~ 0.61.11, De ~ 0.97-1.64, and Dt ~ 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 De was detected before the main shock (De = 0.87 + 0.7b) and during aftershock sequences (De = 2b ± 0.09), which was further on changed to a negative one (De = 2.56 – 1.32b).

Słowa kluczowe

EN

fractal; precursor; seismic pattern; Baladeh-Kojour earthquake; Alborz

PL

fraktal; prekursor; wzór sejsmiczny; trzęsienie ziemi Baladeh-Kojour; Elburs

• Wydawca: Instytut Geofizyki PAN ; Springer
• Czasopismo: Acta Geophysica
• Rocznik: 2014
• Tom: Vol. 62, no. 3
• Strony: 486--504

Twórcy

autor

Agh-Atabai M.

• Department of Geology, Faculty of Sciences, Golestan University, Gorgan, Iran

autor

Mirabedini M.S.

• Department of Geology, Faculty of Sciences, Golestan University, Gorgan, Iran