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| Titel |
Strain Rate Tensor in the Euro-mediterranean Domain from GPS data |
| VerfasserIn |
Yann Ziegler, Frederic Masson |
| 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 |
250088598
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| Publikation (Nr.) |
 EGU/EGU2014-2718.pdf |
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| Zusammenfassung |
| In this work, we compute the strain rate tensor (SRT) in several areas
of the Euro-mediterranean domain using the so-called STIB method
(Strain Tensor from Inversion of Baselines), which uses the length
variations of the baselines between each pair of the geodetic stations
to provide a map of the deformation over the whole area covered by the
network, reducing the impact of erroneous data and noise.
We use the GPS data compilation of Nocquet (2012) and compute the SRT
in the following Mediterranean regions, from West to East:
Iberia-Nubia, Italy, Balkans, Greece, Anatolia and Dead Sea. In
addition to the major tectonic features (extension in the Apennine
Mountains, Corinthian Gulf opening, North Anatolian Fault and so on)
our results highlight new evidence of deformation in these different
zones.
In Iberia-Nubia, along with the compression in the Moroccan Rif and
Atlas, extension appears clearly in the western part of the Alboran
Sea in spite of a lack of GPS data in oceanic areas. Moreover, small
extensions inside the Iberian Peninsula could nuance the common
statement about the rigidity of this area. In Italy, our results
emphasise the strong extension in the Apennines and on the Calabrian
cost. The compression in the subduction zone north of Sicily and the
extension colocated with the Etna volcano are equally well recovered.
In the Balkans, a diffuse extension appears in the Pannonian Basin,
west of the Carpathians and the northward convergence of the
Adria-Apulia microplates with its associated shortening in the
Dinarides is another feature of the Balkanic SRT map. Greece shows
three well-known tectonic patterns: the North Anatolian Fault (NAF)
ending, the Corinthian Gulf opening and the Hellenic subduction
zone. Compression is retrieved along the Cephalonian Fault but we
still lack data south of the Aegean Sea to reveal the shortening
related to the subduction of the African plate. In Anatolia, apart
from the NAF, important deformations are located between the Marmara
Sea and the Mediterranean costs; from a geomorphological point of
view, they result into large active grabens such as the Gediz and
Buyuk Menderes grabens. At last, the Dead Sea fault system shows a
South--North transition from compression to extension with more
complex patterns close to the Karliova triple junction. |
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