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APAME Informe resumido

Project ID: ICA3-CT-2002-10024
Financiado con arreglo a: FP5-INCO 2
País: Turkey

Archeological and paleoseismic data and results including quantitative morphology, geophysical prospecting and GPS results

Field observations included quantitative geomorphology with measurements of past displacements and structural analysis of fault zones that revealed a clear fault segmentation. The correlation between fault segments and macroseismic zones of historical earthquakes (as obtained from the APAME seismicity catalogue) documents the precise location of past earthquake ruptures. Paleoseismic and archeoseismic investigations in Turkey (along the DSF and at Sicantarla Tell site), in Syria (at 3 sites along the Missyaf segment of the DSF), in Lebanon (along the Yammouneh Fault, the Roum Fault, the Serghaya Fault and Rachaya Fault) and in Jordan (at the Karameh and Tell Assaydiyeh along the Jordan Valley) provide the seismic parameters necessary to assess the size of past earthquakes. Detailed topographic profiles and DEM were achieved for each paleoseismic and archeoseismic site (Deliverable D4).

The paleoseismology and archeoseismology approaches (Deliverable D5) clearly contribute to the extension of seismicity catalogues in the past, which covers now in some regions such as the DSF in Turkey and along the Jordan Valley several seismic cycles (> 20 000 years of large earthquakes catalogue). On the other hand, the Paleoseismology of the Al Harif Roman Aqueduct included a detailed study of cores in travertines and showed results consistent with the trenching and excavation that revealed the occurrence of 3 major seismic events in the last 2000 years (among them the AD 1170, Deliverables D5 and D6).

Geophysical and geodetic (GPS) investigations were also conducted at different sites along the fault zones and archaeological sites. The ground penetrating radar (GPR) and magnetic prospecting at the Sicantarla Tell in Turkey displayed ~ 40m of left-lateral offset along the DSF which constitutes a real archive on the occurrence of successive earthquakes since 6500BC. Similarly, the GPR and high-resolution seismic profiles along the Jordan Valley (at Al Karameh-Ghor Kabed pull apart) revealed the extent of the fault zone and related cumulative offsets related with past earthquakes. On the other hand, collaboration with TUBITAK (National Research Centre in Turkey) and the MIT (Boston) allowed the installation of a dense GPS network of 22 (campaign) stations at the junction between the DSF and EAF in the Hatay region in Turkey.

The 2004 campaign measurements at the junction (combined with results of previous campaigns since 1991) characterized the slip rate along the EAF (9.2mm/yr.) along the Karasu Valley fault (4.1 mm/yr.) and along the DSF (6.2mm/yr.). These results are an important contribution to the identification of active with earthquake slip deficit and the potential for future large earthquakes at the junction.

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