A number of large and deadly earthquake occurred on February 6, 2023, in the vicinity of the Eastern Anatolian Fault, which caused a lot of financial and human losses. This fault runs from the south to the northeast of Turkey, which forms a tectonic boundary between the Arabian plate and the Anatolian plate. Due to the fact that the Arabian plate is moving towards the north and the Anatolian plate is moving towards the west, the mechanism of this fault is strike-slip. In this article, the spatial and temporal changes of seismic parameters in an area with coordinates of 35 to 40 degrees longitude and 35.5 to 39 degrees latitude, which includes the Eastern Anatolian fault, have been investigated. To this purpose, seismic data from 01/01/1990 to 02/21/2023 with a moment magnitude greater than or equal to 3.5 (Mw≥3.5) was considered. This research showed that before large earthquakes occurred on February 6, 2023, the seismicity parameter b clearly decreased. This was happened in the about 6 months before the earthquakes so the b-value had significantly decreased from 3.98 to 0.69. Using spatial and temporal analysis of seismic coefficients besides other pre-detectors such as changes in the amount of stress, wave velocity, gravity characteristics, electric resistance and magnetic field can lead to better prediction of hazardous earthquakes.
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