JOURNAL OF SEISMOLOGY, vol.20, no.1, pp.277-289, 2016 (SCI-Expanded)
The western Anatolia extension region consists of major E-W trending normal faults and numerous subsidiary faults aligned obliquely to major fault systems. In this paper, the NW-SE trending Mugla Fault was studied through an archaeoseismological analysis of the Lagina sacred area, which was supported by geological and geomorphological field evidence collected along the fault zone. The sacred area is cut by fractures that have caused extensive deformations and displacements in ruins along the fault. The orientations of collapsed columns, folding on the grounds, dilation, and tilting of the walls are systematic. The axes of the observed deformations are perpendicular to the Mugla Fault and could be related to coseismic effects. Although there are no historical records of a large earthquake on the Mugla Fault, the results of thermoluminescence and radiocarbon dating in the Lagina sacred area indicate that a large event occurred in the 4th c. AD or slightly later. Thus, considering the field evidence that has been collected along the Mugla Fault, it can be concluded that subsidiary faults aligned obliquely to major normal fault systems have strike-slip components and may be associated with a significant portion of the recent dynamics in western Anatolia.