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| Titel |
OSL and TT-OSL dating of sediments and pottery from a paleoseismological trench across the Gyrtoni Fault, Central Greece: Preliminary results |
| VerfasserIn |
Ioannis Tsodoulos, Konstantinos Stamoulis, Christina Papachristodoulou, Konstantinos Ioannides, Spyros Pavlides, Alexandros Chatzipetros, Ioannis Koukouvelas, Riccardo Caputo |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250100765
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| Publikation (Nr.) |
 EGU/EGU2014-16758.pdf |
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| Zusammenfassung |
| T he preliminary results from optically stimulated luminescence (OSL) ages from a
paleoseismological trench excavated in the Gyrtoni Fault, Tyrnavos Basin, Central Greece are
presented. The initial preliminary interpretation of the trench wall structure provided
indications of recent reactivations of the fault. The footwall of the fault consists of well
stratified lagustrine deposits, while the hanging wall consists of poorly stratified
scarp-derived deposits. Seven samples, one for each lithologic unit, were collected from the
upthrown fault block in order to establish a reliable chronological framework and nine
sediment and pottery samples were collected from the downthrown fault block to constrain
the timing of the linear morphogenic earthquakes observed in the trench and thus
reconstruct the recent seismotectonic behaviour. The samples were dated following the
OSL dating method, using the Riso TL/OSL DA-20 reader. The OSL ages were
obtained from chemically purified quartz and a single-aliquot regenerative-dose
(SAR) protocol was followed for the equivalent dose (De) determination. Also, the
natural radioactivity of soil from the surroundings of the original sample location was
assessed, using gamma spectrometry. The dose rates were calculated using the
appropriate dose conversion factors and corrected for the humidity content of the
surrounding soils. The OSL ages from the upthrown fault block are in stratigraphic order
(except one sample), but the signal of the five oldest samples occurs above the
saturation level of the exponential part of the dose response curve and thus the
reliability of the calculated De value for use in dating is uncertain. To obtain a more
reliable De value, thermally transferred optically stimulated luminescence (TT-OSL)
signal has been investigated for five samples. The age of the earthquakes observed in
the trench and the recent seismotectonic behavior of the fault are also discussed. |
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