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Paleoseismological trenching and seismic hazard assessment of the Bozkurt Segment of the Maymundağı fault, Acıgöl Graben, SW Türkiye

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Journal of Mountain Science 2024年第11期21卷 3789-3813页

作者： Ali KAYA Pamukkale University Faculty of EngineeringDepartment of Geological EngineeringDenizli 20160Türkiye

The Acıgöl Graben in SW Turkey,ca.50-55 km in length and 11-15 km in width,formed during the Miocene to Quaternary *** graben is bounded by active normal faults of Maymundağıfault(MF)to the northwest and the Gemişfault Zone(GFZ)to the southeast that have triggered significant earthquakes,causing considerable *** study focuses on the Bozkurt segment of the MF,which caused a damaging earthquake(Mw 6.0)in 2019 and another significant earthquake in 1886 during historical times.A paleoseismological trench survey along the Bozkurt segment revealed at least two faulting events,with the last event producing a vertical displacement of 0.25 *** Optical Stimulated Luminescence(OSL)dating indicates that the last earthquake occurred 3.13±0.33 ka BP,while the penultimate earthquake occurred 4.0±0.72 ka *** dates correspond to a long-term slip rate of approximately 0.36±0.11 mm/a and a mean recurrence interval of 2.08 ka,short-term slip rate 0.78±0.16 mm/a and recurrence interval of 0.96 ka,and compatible with the mean sedimentation rate of 0.26 mm/a,calculated from drill logs in Acıgöl *** the 6 km length of the Bozkurt segment and its vertical displacement of 0.25 m in the last event,this segment has the potential to generate earthquakes ranging from 5.6 to 5.9 ***-term slip rates derived from geomorphological data are 0.56 mm/year to the north and 0.64 mm/a to the south of the graben,indicating higher subsidence on the southern *** rates are in accordance with the slip rates calculated from the paleoseismological trench survey and sedimentation rate from the *** indications show that the Bozkurt segment is an active Holocene fault with relatively long recurrence intervals and low-slip ***,the paleoseismological studies in combination with geomorphological data are important tool to assess seismic hazards and to define the characteristics of individual fault segments.

关键词： Paleoseismology fault slip-rates Subsidence Bozkurt earthquake OSL dating Acıgöl Graben

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