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Seismic behavior of the 1943 segment of the North Anatolian Fault

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Seismic behavior of the 1943 segment of the North Anatolian Fault, Turkey

Aurelia Hubert-Ferrari 1, 2 , Jeff Fraser 1, Kriss Vanneste 1, Sevgi Altinok 3 ,

Laureen Drab 2, Ulas Avsar 1, Erhan Altunel 3

1: Royal Observatory of Belgium Seismology Section, Avenue Circulaire 3, 1180 Brussels, Belgium

2: Ecole Normale Supérieure de Paris, Laboratoire de Geologie, 24 rue Lhomond, 75231 Paris CEDEX 5

3: Osmangazi University, Engeneering Faculty, Dept. of Geology, Eskisehir, Turkey

The North Anatolian Fault is well-known for its remarkable sequence of westward propagating earthquakes of magnitude greater than 7, which occurred between 1939 and 1999. The “Seismic Cycle” Marie Curie project funded by the European Commission focuses on characterizing its seismic behavior. We present here paleoseismological and geomorphological results obtained on the central part of the North Anatolian Fault affected by the 280 km long 1943 earthquake rupture.

Paleoseimic data integrates the two new paleoseimic sites at Destek, near Ladik Lake and at Elmacik near Kamil and Kargi with existing paleoseismic trenches at Ilgaz (Sugai et al., 2003), Havza (Yoshioka et al., 2000), and Alayurt (Hartleb et al., 2003). The integrated data shows a very similar earthquake record in all these trenches separated by up to 240 km, clearly highlighting the lack a significant seismic barrier along the 1943 fault segment.

Geomorphological data from several sites near Kamil suggest non-characteristic slip along the 1943 segment of the North Anatolian Fault (Schwartz and Coppersmith, 1984). New offset measurements linked to 1943 earthquake confirm the small 1 to 2 m dextral slip already documented. However offset geomorphological markers, which age were constrained using radiocarbon dating, indicate that slip during the 1668 and 1050 earthquakes were very large reaching 8 to 10 m.

References:

Hartleb et al., 2003, A 2000-Year-Long Paleoseismologic Record of Earthquakes along the

Central North Anatolian Fault, from Trenches at Alayurt, Turkey, Bull. Seism. Soc. Am., 93, 1935–1954 Sugai et al., 2003, Geological evidence for five large earthquakes on the North Anatolian fault at Ilgaz, during the last 2000 years, a result of GSJ-MTA international cooperative research, Proceeding of the Paleoseismology workshop, USGS Open File Report 99-400 GSJ Interim Report, no.EQ/99/2 and USGS Open-File Report 99-400, 66-72

Schwartz and Coppersmith, 1984, Fault behavior and characteristic earthquakes: Examples from the Wasatch and San Andreas fault zones, JGR 89, 5681-5698.

Yoshioka et al., 2000, Recent surface faulting of the North Anatolian fault along the 1943 Ladik earthquake ruptures Bull. Geol. Survey of Japan, 51, 29-35

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