Widespread Dynamic Triggering of Seismicity in NW Iran by the 2023 Turkey Doublet Earthquakes

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ID: 321658
2026
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Abstract
Summary The Turkey earthquake on February 6, 2023, Mw7.8 and Mw7.6, generated substantial concern about its effect on regional seismicity, especially in neighbouring Iran. Iran is located at the intersection of many major tectonic plates, including the Arabian, Eurasian, and Indian plates. This complex tectonic environment produces a high frequency of seismic activity, making it critical to understand how major earthquakes affect the behaviour of faults in the region. The study examines the dynamic triggering of seismicity in Iran following the Turkish earthquakes using seismic waveform and catalogue data. The bandpass filter, STA/LTA detection, β-statistics, and matched filter technique were used to analyse continuous waveform data of 99 seismic stations (IIEES, IRSC and AZAR networks) to detect small triggered seismic events. This study examines these earthquakes' effects on the Iranian plateau’s seismic patterns, including the potential for dynamic stress transfer and future seismic activity. We observed that tremors and earthquakes occurred at 14 stations. Six stations in the Persian Block, five stations in the Main Recent Fault zone, and one station each in eastern, southeast Iran, western Alborz and central Iran recorded dynamically triggered seismic activity. The triggered earthquakes were located at hypocentral distances of approximately 20 to 200 km relative to the recording stations. The triggered stations are largely concentrated around regions with high concentration of hot springs which implies that crustal fluids can raise pore pressure and contribute to the occurrence of delayed seismic events. Following the Mw7.8 mainshock, there was a rapid increase in the seismic activity and it continued for ∼5 hours before returning back to the background level. The second large event Mw7.6 did not cause any triggering. These observations imply that transitory seismic activation in Iran occurs through dynamic stress transfer. In addition, the findings suggest that subsurface fluids would have been crucial to delayed triggering events, especially in fluid-rich fault zones. This work shows the importance of remote dynamic triggering in Iran’s tectonically complicated and seismically active areas.
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Authors Tony Saini, Abhey Ram Bansal, Abdolreza Ghods
Journal geophysical journal international
Year 2026
DOI
10.1093/gji/ggag291
URL
https://doi.org/10.1093/gji/ggag291
Keywords Keywords not found

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