Journal : Acta Geophysica
Article : Temporal variations of seismicity parameters in the Central Alborz, Iran

Authors :
Shiuly, A
Department of Earthquake Engineering, Indian Institute of Technology Roorkee, Roorkee, India,
Kumar, V
Department of Earthquake Engineering, Indian Institute of Technology Roorkee, Roorkee, India,
Narayan, J.P.
Department of Earthquake Engineering, Indian Institute of Technology Roorkee, Roorkee, India, jaypnfeq@iitr.ernet.in,
Mousavian, R.
Department of Geodesy and Geomatics Engineering, K.N. Toosi University of Technology, Tehran, Iran, R_mousavian@yahoo.com,
Hossainali, M.M.
Department of Geodesy and Geomatics Engineering, K.N. Toosi University of Technology, Tehran, Iran, Hossainali@kntu.ac.ir,
Wiszniowski, J.
Institute of Geophysics, Polish Academy of Sciences, Warszawa, Poland, jwisz@igf.edu.pl,
Plesiewicz, B.M.
Institute of Geophysics, Polish Academy of Sciences, Warszawa, Poland,
Trojanowski, J.
Institute of Geophysics, Polish Academy of Sciences, Warszawa, Poland,
Agh-Atabai, M.
Department of Geology, Faculty of Sciences, Golestan University, Gorgan, Iran, maryamataby@yahoo.com,
Mirabedini, M.S.
Department of Geology, Faculty of Sciences, Golestan University, Gorgan, Iran, m_mirabedini89@yahoo.com,
Abstract : 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).

Keywords : fraktal, prekursor, wzór sejsmiczny, trzęsienie ziemi Baladeh-Kojour, Elburs, fractal, precursor, seismic pattern, Baladeh-Kojour earthquake, Alborz,
Publishing house : Instytut Geofizyki PAN
Publication date : 2014
Number : Vol. 62, no. 3
Page : 486 – 504

Bibliography
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DOI :
Qute : Shiuly, A ,Kumar, V ,Narayan, J.P. ,Mousavian, R. ,Hossainali, M.M. ,Wiszniowski, J. ,Plesiewicz, B.M. ,Trojanowski, J. ,Agh-Atabai, M. ,Mirabedini, M.S. ,Mirabedini, M.S. , Temporal variations of seismicity parameters in the Central Alborz, Iran. Acta Geophysica Vol. 62, no. 3/2014
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