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See detailThe 2500 yr long paleoseismological record of the Hazar Lake, East Anatolian fault, Turkey
Hubert, Aurelia ULg; Vanneste, K.; Cagatay, N et al

Conference (2010, September)

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See detailA relict sedimentary record of seven earthquakes between 600 AD and 2000 BC on the central North Anatolian Fault at Elmacik, near Osmancik, Turkey
Fraser, J.; Hubert, Aurelia ULg; Vanneste, K. et al

in Geological Society of America Bulletin (2010), 122(11-12), 1830-1845

Deformation along the northern edge of the westward-moving Anatolian plate is concentrated along the North Anatolian fault. This northward-arching fault extends from the Karliova triple junction in the ... [more ▼]

Deformation along the northern edge of the westward-moving Anatolian plate is concentrated along the North Anatolian fault. This northward-arching fault extends from the Karliova triple junction in the east, ∼1500 km into the Aegean Sea in the west. A sequence of twentieth-century earthquakes ruptured the fault, displaying a spatiotemporal pattern consistent with a stress triggering mechanism. In 1943, the Mw 7.6 Tosya earthquake ruptured a 280-km-long segment near the center of the fault. Four paleoseismic investigations have previously investigated this segment, and the present study was conducted near its center, in an ∼180-km-long gap between existing studies. A paleoseismic trench revealed a sequence of eight sediment packages abutting a highly developed shear zone. Each of the packages consists of a fine-grained layer overlying a coarse-grained layer. Based on correlation between the age of the base of the coarse-grained layers and existing earthquake records, we infer that the coarse-grained layers were deposited in response to earthquakes because of increased erosion on an adjacent steep slope. The most recent event horizon may correlate to the historical 529 A.D. earthquake. Timing of six older earthquakes is constrained to (2s): 23 B.C.–103 A.D., 609–185 B.C., 971–814 B.C., 1227–968 B.C., 2050–1777 B.C., and 2556–2235 B.C., which correspond to a summed interevent time of 97–912 yr (2s). The earthquake record is relict because the local stream network was incised ca. 1000 A.D., isolating the trench site from its sediment source. A stream near the trench was subsequently offset by 23.5 ± 1.5 m, yielding a right-lateral slip rate of 21.4–25.6 mm/yr and suggesting that the 1943 rupture caused an uncharacteristically small offset. [less ▲]

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See detailStructure and evolution of Lake Hazar pull-apart Basin along the East Anatolian Fault
Garcia Moreno, D.; Hubert, Aurelia ULg; Moernaut, J. et al

in Basin Research (2010)

The Hazar Basin is a 25 km-long, 7 km-wide and 216 m-deep depression located on the central section of the East Anatolian Fault zone (eastern Turkey) and predominantly overlain by Lake Hazar. This basin ... [more ▼]

The Hazar Basin is a 25 km-long, 7 km-wide and 216 m-deep depression located on the central section of the East Anatolian Fault zone (eastern Turkey) and predominantly overlain by Lake Hazar. This basin has been described previously as a pull-apart basin because of its rhombic shape and an apparent fault step-over between the main fault traces situated at the southwestern and northeastern ends of the lake. However, detailed structural investigation beneath Lake Hazar has not been undertaken previously to verify this interpretation. Geophysical and sedimentological data from Lake Hazar were collected during field campaigns in 2006 and 2007. The analysis of this data reveals that the main strand of the East Anatolian Fault (the Master Fault) is continuous across the Hazar Basin, connecting the two segments previously assumed to be the sidewall faults of a pull-apart structure. In the northeastern part of the lake, an asymmetrical subsiding sub-basin, bounded by two major faults, is cross-cut by the Master Fault, which forms a releasing bend within the lake. Comparison of the structure revealed by this study with analogue models produced for transtensional step-overs suggests that the Hazar Basin structure represents a highly evolved pull-apart basin, to the extent that the previous asperity has been bypassed by a linking fault. The absence of a step-over structure at the Hazar Basin means that no significant segmentation boundary is recognised on the East Anatolian Fault between Palu and Sincik. Therefore, this fault segment is capable of causing larger earthquakes than recognised previously. [less ▲]

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See detailRecent Behavior of the North Anatolian Fault: Insights from an Integrated Paleoseismological Dataset
Fraser, J.; Vanneste, K.; Hubert, Aurelia ULg

in Journal of Geophysical Research (2010), 115(B09316),

The North Anatolian Fault (NAF) is a right‐lateral plate boundary fault that arcs across northern Turkey for ∼1500 km. Almost the entire fault progressively ruptured in the 20th century, its cascading ... [more ▼]

The North Anatolian Fault (NAF) is a right‐lateral plate boundary fault that arcs across northern Turkey for ∼1500 km. Almost the entire fault progressively ruptured in the 20th century, its cascading style indicating that stress from one fault rupture triggers fault rupture of adjacent segments. Using published paleoseismic investigations, this study integrates all of the existing information about the timing of paleoearthquakes on the NAF. Paleoseismic investigation data are compiled into a database, and for each site a Bayesian, ordering‐constrained age model is constructed in a consistent framework. Spatial variability of recurrence intervals suggests a spatial pattern in the behavior of earthquakes on the NAF that may correspond to the tectonic provinces within the Anatolian plate. In the west, the shear stress associated with the escaping Anatolian plate interplays with the tensile stress associated with the Aegean extensional province. Along this western transtensional section we recognize short recurrence intervals and switching between the furcated fault strands. The central section of the NAF is translational with little influence of fault‐normal stresses from other tectonic sources. This section tends to rupture in unison or close succession. The eastern section of the NAF is transpressional due to the compressional fault‐normal stress associated with the indenting Arabian plate. Along this section the recurrence intervals are bimodal, which we attribute to variable normal stress, although there are other possible causes. [less ▲]

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See detailNo earthquake with characteristic slip on the North Anatolian Fault, Turkey
Hubert, Aurelia ULg; Fraser, J.; Drab, L. et al

in Geophysical Research Abstracts (2009, April)

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See detailPaleo-earthquake timing on the North Anatolian Fault: Where, when, and how sure are we?
Fraser, J; Vanneste, K.; Hubert, Aurelia ULg

in Geophysical Research Abstracts (2009, April), 11

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See detailStructure of the East Anatolian Fault at the Hazar Basin, eastern Turkey
Garcia Moreno, David; Hubert, Aurelia ULg; Moernaut, J et al

in Cahiers du Centre Européen de Géodynamique et de Séismologie (2009), 28

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See detailDefining additional stratigraphy in paleosismic trenches by 2D logging of magnetic susceptibility. A paleoseismic investigation near Lake Ladik, North Anatolian Fault, Turkey.
Fraser, J; Hubert, Aurelia ULg; Vanneste, K. et al

in EOS : Transactions, American Geophysical Union (2008, December), 89(53)(Fall Meet. Suppl.), 21-1942

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See detailSeismic patterns of the Anatolian fault system (Turkey)
Hubert, Aurelia ULg; Fraser, J.; Boes, X et al

Conference (2008, November)

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See detailStructure and evolution of a main segment boundary along the East Anatolian fault, Turkey 2008
Garcia-Moreno, D.; Hubert, Aurelia ULg; Moernaut, J et al

Conference (2008, November)

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See detailThe Hazar pull-apart along the East Anatolian Fault: Structure and active deformation
Garcia Moreno, David; Hubert, Aurelia ULg; Moernaut, J et al

in Geophysical Research Abstracts (2008, April), 10

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See detailA 3000 year chronology of North Anatolian Fault ruptures, utilizing magnetic susceptibility trench logging, near Lake Ladik, Turkey
Fraser, J; Pigati, J; Hubert, Aurelia ULg et al

in Geophysical Research Abstracts (2008, April), 10

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See detailUnderstanding the irregularity of Seismic cycles: A Case study in Turkey-A Marie Curie Excellence Team Project
Hubert, Aurelia ULg; Boes, X; Fraser, J et al

in Geophysical Research Abstracts (2007, April), 9

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