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See detailComparing the paleoseismic record obtained by coring a sag-pond and by classical trenching along the eastern segment of the North Anatolian Fault
Hubert, Aurelia ULg; Avsar, Ulas; Fraser, Jeef et al

Conference (2012, October)

Shallow lakes along minor structural bends or discontinuities of strike-slip fault are not usually paleoseismological target sites. In the present talk we show that a 2m deep, 700m long lake crosscut by ... [more ▼]

Shallow lakes along minor structural bends or discontinuities of strike-slip fault are not usually paleoseismological target sites. In the present talk we show that a 2m deep, 700m long lake crosscut by the eastern segment of the North Anatolian Fault contains a reliable paleoseimological record obtained through coring. The North Anatolian Fault, a major strike-slip fault in Turkey, last ruptured across the Aşağıtepecik Lake in 1939 with a slip of about 6 m. Seismic lines still show remains of the fault rupture forming minor scarps across the lake. Collected short cores display a set of sedimentary sequences. Each sequence is composed of similar organic rich sedimentary units. The lower unit is dark and fibrous, and is similar to the present sedimentation at the top of the core. The upper unit is disturbed and has anomalous organic matter content, grain size and mineralogy. It is interpreted as an earthquake induced sedimentary event. The 2.5 m long AT2007LG core comprises four sequences, and four sedimentary events. Radiogenic 210Pb and 137Cs data obtained in Boes et al. (2009) imply that the shallowest event 1 was triggered by the 1939 M=7.9 Erzincan earthquake. Radiocarbon dating suggest that events 2 and 4 were initiated by the 1668 and 1254 historical earthquakes. The event 3 does not correspond to a large historical earthquake on the NAF. The record can be compared to a classical paleoseismological study located about 2.5 km more to the east. The investigation comprised three paleoseismic trenches located along about 2km of the principal fault strand. Trench T1 revealed clear evidence for one earthquake interpreted to be the 1939 Erzincan earthquake. Trench T2 revealed evidence of three earthquakes. Trench T3 revealed a record of colluvial wedges that interfinger with fine-grained inter-fan deposits. We interpreted a sequence of six earthquake event horizons including the 1939 Erzincan earthquake. The first three earthquakes are correlated to historical earthquakes in A.D. 1668, 1254, 499 and two further events were identified at 881 – 673 B.C. and 1406 – 1291 B.C. (2σ age ranges). By comparing all available earthquake timing studies,we conclude that the 1939 earthquake segment does not always rupture in unison. [less ▲]

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See detailA 3000-year Record of Surface Rupturing Earthquakes at Gunalan; Variable Rupture Lengths on 1939 Erzincan Earthquake Rupture Segment of the North Anatolian Fault, Turkey
Fraser, J. G.; Hubert, Aurelia ULg; Verbeck, A. et al

in Annals of Geophysics = Annali di Geofisica (2012)

The North Anatolian Fault is a ~1200 km long right-lateral strike-slip fault that forms the northern boundary of the Anatolian plate. A damaging sequence of earthquakes ruptured almost the entire fault in ... [more ▼]

The North Anatolian Fault is a ~1200 km long right-lateral strike-slip fault that forms the northern boundary of the Anatolian plate. A damaging sequence of earthquakes ruptured almost the entire fault in the twentieth century. This study adds to the growing number of paleoseismic investigations on the 350 km long 1939 Erzincan earthquake rupture segment, which is toward the eastern end of the North Anatolian Fault in Turkey. Using three paleoseismic trenches located along about 2km of the principal fault strand, this study determines the timing of five earthquakes prior to the 1939 earthquake. The first three earthquakes are correlated to historical earthquakes in A.D. 1668, 1254, 499 and two further events were identified at 881 – 673 B.C. and 1406 – 1291 B.C. (2σ age ranges). By comparing the earthquake timing determined in this study to the results of other paleoseismic investigations on the 1939 rupture segment, it becomes clear that this historical rupture segment does not always rupture in unison. This analysis indicates that the A.D. 499 earthquake was the last time the 1939 rupture segment ruptured in unison; although partial ruptures of the 1939 rupture segment occur more frequently and also produce large magnitude earthquakes (> Mw 7). [less ▲]

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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 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 detailSeismic behavior of the 1943 segment of the North Anatolian Fault
Hubert, Aurelia ULg; Fraser, J. S.; Vanneste, K. et al

in TMMOB Jeoloji Mühendisleri Odasi (Ed.) 62nd Geological Kurultai of Turkey. Abstracts Book: 13-17 April, 2009‬ (2009, April)

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See detailA relict sedimentary record of 7 earthquakes between 600AD and 2000BC on the central North Anatolian Fault at Elmacik, near Osmancik, Turkey
Fraser, J.G.; Vanneste, K.; Hubert, Aurelia ULg

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 detailA 3000-year record of ground rupturing earthquakes along the central North Anatolian Fault near Lake Ladik, Turkey
Fraser, I.; Pigati, J. S.; Hubert, Aurelia ULg et al

in Bulletin of the Seismological Society of America (2009), 99(10.1785/0120080024), 2681-2703

The North Anatolian Fault (NAF) is a ~1500-km-long, arcuate, dextral strike-slip fault zone in northern Turkey that extends from the Karliova triple junction to the Aegean Sea. East of Bolu, the fault ... [more ▼]

The North Anatolian Fault (NAF) is a ~1500-km-long, arcuate, dextral strike-slip fault zone in northern Turkey that extends from the Karliova triple junction to the Aegean Sea. East of Bolu, the fault zone exhibits evidence of a sequence of large (Mw>7) earthquakes that occurred during the 20th century that displayed a migrating earthquake sequence from east to west. Prolonged human occupation in this region provides an extensive, but not exhaustive, historical record of large earthquakes prior to the 20th century that covers much of the last 2000 years. In this study, we extend our knowledge of rupture events in the region by evaluating the stratigraphy and chronology of sediments exposed in a paleoseismic trench across a splay of the NAF at Destek, ~6.5 km east of Lake Ladik (40.868°N, 36.121°E). The trenched fault strand forms an uphill-facing scarp and associated sediment trap below a small catchment. The trench exposed a narrow fault zone that has juxtaposed a sequence of weakly-defined paleosols interbedded with colluvium against highly-fractured bedrock. We mapped magnetic susceptibility variations on the trench walls and found evidence for multiple visually unrecognized colluvial wedges. This technique was also used to constrain a predominantly dip-slip style of displacement on this fault splay. Sediments exposed in the trench were dated using both charcoal and terrestrial gastropod shells to constrain the timing of the earthquake events. While the gastropod shells consistently yielded 14C-ages that were too old (by ~900 years), we obtained highly reliable 14C-ages from the charcoal by dating multiple components of the sample material. Our radiocarbon chronology constrains the timing of seven large earthquakes over the past 3000 years prior to the 1943 Ladik earthquake, including event ages (including 2 sigma error):1437-1788AD, 1034-1321AD, 549-719AD, 17-585AD (1-3 events), 351BC-28AD, 700-392BC, 912-596BC. Our results indicate an average inter-event time of 385±166yrs (1 sigma) [less ▲]

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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 detailTraces of the last earthquake sequence (1939-1944) along NAF from lacustrine sediments
Avsar, Ulas; Boes, X; Hubert, Aurelia ULg 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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See detailPresent-day vertical crustal motion and active faulting in the Roer graben
Camelbeeck, Thierry; Warnant, René ULg; Vanneste, K. et al

Conference (2003)

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See detailPresent day and geologic deformation rates in the Ardenne and the lower Rhine embayment (North-western Europe)
Van Camp, Michel; Camelbeeck, Thierry; Vanneste, K. et al

Conference (2003)

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See detailLocal Hydrological effects in Membach, Belgium: influence on the long term gravity variation
Van Camp, Michel; Dassargues, A.; Vanneste, K. et al

Conference (2003)

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