At the Tevekkelli Trench, excavated across the southwestern part of the Pazarcık segment of the East Anatolian Fault, Yönlü and Karabacak (2023:5-6) identified Event U as one of at least two older surface ruptures that cut unit f and are capped by unit h. The trench exposed a prominent shear zone made of pervasively sheared plastic clay gouge, with shear fabrics and faulted blocks indicating dominant strike-slip movement.

A radiocarbon sample from unit h, which postdates Event U, produced a calibrated age of 3321–2871 BCE ( 2σ), while a sample from unit f, which predates Event U, produced a calibrated age of 5961–5631 BCE (2σ). These two samples therefore constrain Event U to between 5961 and 2871 BCE (2σ).

Yönlü and Karabacak (2023:6) note that the Tevekkelli T1 stratigraphy does not allow these older ruptures to be differentiated in detail, probably because later surface ruptures were confined to the same narrow fault zone and overwrote earlier fault strands. Event U appears to represent a Middle Holocene surface rupture on the Tevekkelli subsection of the Pazarcık segment, but it cannot be correlated with any historical earthquake.

Figure 6b - Trench Log of NE wall of Tevekkelli trench - Thin black lines are stratigraphic contacts - colours show units - red lines are traces of faults - small rounded outlines are gravels - (trench location 322 045 m E/4 147107 m N) - Yönlü and Karabacak (2023)