• Paleoseismicity is defined as the study of the occurrence, size, timing, and frequency of pre-historic earthquakes

• Paleoseismic data may be gathered from fault exposures, faulted landforms, fault scarps, stratigraphic features, and geomorphic features.

• Trenching of a fault scarp is probably the most common and high potential technique for investigating an active fault with surface rupture.

• A critical part of the paleoseismological investigation is the timing of paleoearthquakes and the dating of sediments or geomorphic features that record the deformation.

• The recurrence intervals between surface faulting events on the northern branch (Duzce Fault) of the NAFS is at least 300 years, and may range from 300 to a maximum of 800 years.

• The recurrence intervals between surface faulting events on the southern branch (Mudurnu Fault) of the NAFS is about 300 years.