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See detailPaleoseismic record obtained by coring a lacustrine sag-pond along the North Anatolian Fault (Turkey)
Hubert, Aurelia ULg; Avsar, Ulas; El Ouahbi, Meriam et al

in Annals of Geophysics = Annali di Geofisica (2012)

Shallow lakes along minor structural bends or discontinuities of strike-slip fault are not usually paleoseismological target sites. In the present study 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 study we show that a 2m deep, 700m long lake crosscut by the North Anatolian Fault contain a reliable paleoseimological record obtain through coring. The North Anatolian Fault, a major strike-slip fault in Turkey last ruptured across the Asacipetecik Lake in 1939 with a slip of about 6 m. Seismic lines still shows remains of the fault ruptures forming minor 10 cm high scarps across the lake. Collected short cores show a set of sedimentary sequences composed of three different units. The lower unit, dark and fibrous, is similar to the present sedimentation at the top of the core. The strongly disturbed and whitish top unit 1 has anomalous organic matter content, grain size and mineralogy. The unit 2 is intermediate in between unit 1 and 3. The present stratigraphy is related to earthquake shaking inducing (1) sediment resuspension; (2) reworking of sediments coming from co-seismic scarps and lake margins; (3) increase in sedimentary runoff into the lake. The 2.5 m long core comprises 4 sequences, and thus 4 sedimentary events. Cesium and Lead data obtained in Boes et al. (2009) imply that Event 1 was triggered by the 1939 M=7.9 Erzincam Earthquake. Radiocarbon age dating suggest that Events 3 and 4 are initiated by the 1254 and the 1045 historical earthquake. Event 2 may correspond to the 1668 earthquake documented in paleoseimological trenches a few kilometers to the east. [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 detailEvaluation of the automatic ionogram scaling for use in real-time ionospheric density profile specification: Dourbes DGS-256/ARTIST-4 performance.
Stankov, Stanimir; Jodogne, Jean-Claude; Kutiev, Ivan et al

in Annals of Geophysics = Annali di Geofisica (2012), 55(2), 283-291

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See detailK-type geomagnetic index nowcast with data quality control
Stankov, Stanimir; Stegen, Koen; Warnant, René ULg

in Annals of Geophysics = Annali di Geofisica (2011), 54(3), 285-295

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