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| Titel |
New GPS measurements in SE Turkey and in NW Syria |
| VerfasserIn |
Y. Mahmoud, F. Masson, M. Meghraoui, Z. Cakir, A. Alchalbi, M. Daoud, S. Ergintav, S. Inan |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250033537
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| Zusammenfassung |
| The triple junction area located between SE Turkey and NW Syria is tectonically complex
because it is at the intersection of three main fault systems, the left-lateral East Anatolian
Fault Zone (EAF), the left-lateral Dead Sea Fault (DSF) and the Cyprus Arc. Previous GPS
results indicate 9.7+0.9 mm/yr along the EAF and 2.5-6 mm/yr along the DSF (McClusky et
al., 2003; Reilinger et al., 2006; Alchalbi et al., 2009). This zone of active deformation is
at the boundary between the Arabian, African, and Anatolia-Eurasia plates. The
tectonic complexity results from the existence of several tectonic blocks limited
by individual fault segments (DSF, EAF, Osmaniye fault, Karasu fault, Latakia
fault, Jisr-al-shuggur fault, Idleb fault and Afrin fault) whose kinematics and related
fault-slip rates are poorly constrained. Main issues to address in this region are:
What are the velocities (geodetic) and slip rates (geologic) along the three main
strike-slip fault systems? What is the role of individual tectonic blocks in the regional
deformation?
In order to answer these questions we established a network of 59 campaign GPS
points in NW Syria and in SE Turkey. The 59 GPS monuments consist of 10 cm
steel pins fixed into bedrock and are located on both sides of the active faults. The
sites are distributed in 4 main profiles (35 points) in Syria with an extension of 2
profiles (24 points) in Turkey. The compatibility between all profiles in Syria and in
Turkey is taken into account for a better assessment of velocity field and physical
parameters of fault branches along the three major fault systems. The first campaign
was carried out in 2009 where the 24 points in Turkey are measured in September,
where all sites observed for 24 hours over two sessions of 12 hours using Thales Z
Max receivers with Thales Z Max Ashtech antenna. The 35 points in Syria were
measured in October and November 2009 where each site was observed for one
session of 24 hours using Thales DSNP 6502MK receivers with Leica AT504 Choke
Ring Antenna. The GPS data were logged with a 15s and 30s sampling rate in
Turkey and in Syria respectively, and antennas were fixed on monuments using
antenna masts in order to reduce uncertainty owing to antenna setup. Two other
campaigns are planned for the 2010 and 2011. Data gathered will be processed together
with previously collected data from a set of 10 permanent sites in Turkey and 6
others in Syria (Reilinger et al., 2006; Alchalbi et al., 2009) using GAMIT/GLOBK
program.
The velocity field vectors derived from all sites in the region will provide some
constraints on the active deformation and its distribution at the triple junction. In addition, our
study will provide a better understanding on how the geodetic strain cumulates and can be
released in this region. |
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