References of "Boes, X"
     in
Bookmark and Share    
Full Text
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)

Detailed reference viewed: 20 (3 ULg)
Full Text
Peer Reviewed
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 ▲]

Detailed reference viewed: 98 (6 ULg)
Full Text
Peer Reviewed
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

Detailed reference viewed: 28 (1 ULg)
Full Text
Peer Reviewed
See detailLarge earthquakes Cycles in Lake Sediments along the North Anatolian Fault, Turkey
Boës, X.; Moran, S. B.; King, J. et al

in Journal of Paleolimnology (2009), (10.1007/s10933-009-9376-x),

In 1999, the large surface-rupturing earth- quakes of Izmit and Duzce completed a 60-year cycle that included a westward migration of nine consecutive large earthquake failures ([50 km surface rupture ... [more ▼]

In 1999, the large surface-rupturing earth- quakes of Izmit and Duzce completed a 60-year cycle that included a westward migration of nine consecutive large earthquake failures ([50 km surface rupture), which started with the 1939 Erzincan earthquake in eastern Turkey. In this study, we focused on seismic cycles and seismic risk predictability along the North Anatolian Fault (NAF). Toward the west end of the NAF (26°E–32°E, i.e. Bolu), large earthquake fre- quency is measured from either historic earthquake catalogs, or geologic records from isolated outcrops and marine sediment cores from the Marmara Sea. In comparison, the eastern part of the NAF zone (32°E– 42°E) is less well documented by palaeo-seismologic archives. Thus, the sediment records of lake basins located on the eastern NAF zone constitute a unique opportunity for testing a new palaeo-seismologic approach. To this end, we used a diverse array of complementary methods involving: (1) a 600-km transect of fault-related lakes, (2) sedimentologic observations on cores from six lakes, and (3) a comparison between records of catastrophic sediment transfers in lakes (i.e. radionuclide chronomarkers and erosion tracers) and historic earthquake reports. Our study indicates that lakes along the NAF are sensitive geologic recorders of large surface-rupturing earth- quakes (surface-wave magnitude (Ms) C 6.9); smaller intensities are not recorded. The most responsive lake systems exhibit increases in sediment accumulation by a factor of [40 for a [3-m strike-slip displacement (Ms C 7). However, based on results from the 1939 Erzincan earthquake (Ms = 7.8) chronostratigraphic marker, large surface-rupturing earthquakes are detected only by certain lake records and not by others. Matching multiple lake records along the NAF pro- vides information both on the location of a surface rupture of a paleo-earthquake as well as its magnitude. Finally, the shallow lake basins along the NAF could potentially document cycles of large seismic events for at least the late Holocene. [less ▲]

Detailed reference viewed: 49 (2 ULg)
Full Text
See detailSedimentological fingerprints of recent earthquakes in lake sediments: A case study on the North Anatolian Fault (NAF), Turkey
Avsar, Ulas; Boes, X; Hubert, Aurelia ULg et al

in EOS : Transactions, American Geophysical Union (2008, December), 89(53)(Fall Meet. Suppl.), 21-1919

Detailed reference viewed: 13 (0 ULg)
See detailKuzey Anadolu Fayı Üzerinde Yer Alan Sığ Göllerde Tarihsel Depremlerin Sedimantolojik İzlerinin Araştırılması
Avsar, Ulas; Boes, X; Hubert, Aurelia ULg et al

Conference (2008, November)

Detailed reference viewed: 9 (1 ULg)
Full Text
See detailSeismic patterns of the Anatolian fault system (Turkey)
Hubert, Aurelia ULg; Fraser, J.; Boes, X et al

Conference (2008, November)

Detailed reference viewed: 13 (1 ULg)
See detailSedimentological traces of earthquakes in recent lakes sediments along the North Anatolian Fault, Turkey
Avsar, Ulas; Boes, X; Hubert, Aurelia ULg et al

Conference (2008, October)

Detailed reference viewed: 5 (0 ULg)
Full Text
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

Detailed reference viewed: 11 (1 ULg)
Full Text
Peer Reviewed
See detailClimate oscillations evidenced by spectral analysis of Southern Chilean lacustrine sediments: the assessment of ENSO over the last 600 years
Fagel, Nathalie ULg; Boes, X.; Loutre, M. F.

in Journal of Paleolimnology (2008), 39(2), 253-266

The Chilean Lake District (38-42 degrees S) is strongly influenced by Southern westerlies-driven precipitations. At 40 degrees S Lago Puyehue provides high resolution sedimentation rates (similar to 1-2 ... [more ▼]

The Chilean Lake District (38-42 degrees S) is strongly influenced by Southern westerlies-driven precipitations. At 40 degrees S Lago Puyehue provides high resolution sedimentation rates (similar to 1-2 mm/yr) suitable for annual climate reconstruction. Several short and long sediment cores were collected in this lake. Their analysis aim at a better understanding of climate mechanisms related to ENSO in this part of the world. The recognition of ENSO related periodicities and their stability is studied through the analysis of two short varved cores collected from underflow and interflow key sites. According to varve chronology controlled by Cs-137 and Pb-210 profiles and chronostratigraphical markers, the short core from underflow site (PU-I) spans 294 +/- 18 years and the core in the interflow site (PU-II) covers 592 +/- 9 years. Several methods of spectral analysis were applied on the total varve thickness to identify potential periodicities in the signal. Blackman-Tuckey, Maximum Entropy, Multi-Taper Methods (MTM) and singular spectrum analysis were applied on the whole record. In addition, evolutive MTM and wavelet analyses allow to identify temporal influence of some periodicities. In the PU-I studied interval (AD 1700-2000), a period at similar to 3.0 years appears in a large part of the interval, mostly in the recent part. Periods at similar to 5.2 and similar to 23 years also show up. PU-II record (AD 1400-2000) displays the most robust periodicities at around 15, 9, 4.4, 3.2 and 2.4 years. These periodicities are in good agreement with the sub-decadal periods identified by Dean and Kemp (2004) and linked to the El Nino Southern Oscillation and the Pacific Decadal Oscillation. Differences in the recorded periodicities between PU-I and PU-II sites are consistent with different sedimentation processes in the lake. According to climate instrumental data for the last 20 years, varves in PU-I site are mostly related to fluvial dynamics and regional climate factors, i.e., precipitation, temperature and wind. In PU-II site, varves increment is related to both regional and global climate forcing factors, i.e., El Nino Southern Oscillation. The evolutive MTM analysis and the wavelet analysis suggest a striking break in the periodicities at around AD 1820. Finally relationships between El Nino and longer term climate phase like the Little Ice Age (LIA) are also assessed. [less ▲]

Detailed reference viewed: 68 (3 ULg)
Full Text
See detailTraces of the last earthquake sequence (1939-1944) along NAF from lacustrine sediments.
Avsar, U.; Boes, X.; Hubert-Ferrari, A. et al

Poster (2008)

Detailed reference viewed: 7 (0 ULg)
Full Text
See detailSedimentological Fingerprints of Recent Earthquakes in Lake Sediments: A Case Study on the North Anatolian Fault (NAF), Turkey
Avsar, U.; Boes, X.; Hubert-Ferrari, A. et al

Poster (2008)

Detailed reference viewed: 15 (2 ULg)
Full Text
See detailPotential of Shallow Lake Systems to Trace Environmental Changes Caused by Earthquakes
Avsar, Ulas; Boes, X; Hubert, Aurelia ULg et al

in Geophysical Research Abstracts (2007, April), 9

Detailed reference viewed: 10 (0 ULg)
Full Text
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

Detailed reference viewed: 16 (0 ULg)
Full Text
See detailDevelopment of paleoseismic trench logging and dating techniques: a case study on the Central North Anatolian Fault
Fraser, Jeff; Pigati, J.S.; Hubert, Aurelia ULg et al

in Geophysical Research Abstracts (2007, April), 9

Detailed reference viewed: 13 (0 ULg)
Full Text
Peer Reviewed
See detailTemporal evolution of sediment supply in Lago Puyehue (Southern Chile) during the last 600 yr and its climatic significance
Bertrand, S.; Boes, X.; Castiaux, J. et al

in Quaternary Research (2005), 64(2), 163-175

Short-term climate changes in Southern Chile are investigated by a multi-proxy analysis of a 53-cm-long sedimentary sequence selected among eight short cores retrieved in Lago Puyehue (Chile, 40 degrees S ... [more ▼]

Short-term climate changes in Southern Chile are investigated by a multi-proxy analysis of a 53-cm-long sedimentary sequence selected among eight short cores retrieved in Lago Puyehue (Chile, 40 degrees S). This core contains a 600-yr-long undisturbed record of paleo-precipitation changes. Two measurement methods for sediment density, organic matter and biogenic silica contents are compared and the most appropriate techniques are selected. Together with aluminium and titanium concentrations, grain size and geochemical properties of the organic matter, these proxies are used to demonstrate paleo-precipitation changes around 40 degrees S. Increase of terrigenous particle supply between A.D. 1490 and A.D. 1700 suggests a humid period. Contemporaneously, delta C-13 data show increasing lake productivity, in response to the high nutrient supply. The A.D. 1700-1900 interval is characterized by a decreasing terrigenous supply and increasing delta C-13 values, interpreted as a drying period. The magnetic susceptibility signal, reflecting the terrigenous/biogenic ratio, demonstrates that similar variations occur in all the undisturbed sedimentary environments of Lago Puyehue. The A.D. 1490-1700 wet period is associated with the onset of the European Little Ice Age (LIA) and interpreted as its local signature. This work supports the fact that the LIA was a global event, not only restricted to the Northern Hemisphere. (c) 2005 University of Washington. All rights reserved. [less ▲]

Detailed reference viewed: 120 (1 ULg)