Bi Modal Behavior Of The North Anatolian Fault

​The North Anatolian fault is one of the best studied dextral strike slip faults in the world. Combination of multiple investigation methods; such as traditional paleoseismic excavations, archeoseismology, dendroseismology, mapping and dating of offset geomorphic features, and geodetic observations performed along the 1200km-long fault over the past decade yield new insights into the spatio-temporal behavior of the North Anatolian fault

23 Apr 2015
Ozgur Kozaci

Abstract

Integration of such complementary methods helped us reduce the uncertainties on interpretations, revise our early measurements, and enhance our understanding of the fault behavior. Paleoseismic data suggest that the majority of the North Anatolian fault may rupture in short (about a century long) sequences with less than approximately 300 year recurrence intervals as well as occasional 600 year or longer interseismic periods followed by long, single co-seismic ruptures involving multiple segments. The generally accepted maximum co-seismic displacement per event for the North Anatolian fault is approximately 5 meters. However, integration of geologic slip rate sites and nearby paleoseismic trench sites suggest that the 20th-century rupture displacements (approximately 4-5 meters) may not be “typical” and the approximately 8-10 meter 1939 Erzincan earthquake rupture may not be that extraordinary. These observations will likely have implications on both our scientific understanding on fault behavior from a strain accumulation and stress release cycle perspective and also on seismic hazard assessment studies.

 

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