Resumo

ABDUL-WAHED, Mohamad Khir  e  ALISSA, Mohammed. Present-Present-day stress state in northwestern Syriarthwestern Syria. Geofís. Intl [online]. 2020, vol.59, n.4, pp.300-316.  Epub 28-Nov-2022. ISSN 2954-436X.  https://doi.org/10.22201/igeof.00167169p.2020.59.4.2038.

Northwestern Syria is a key area in the eastern Mediterranean to study the active tectonics and stress pattern across the Arabia-Eurasia convergent plate boundary. This study aims to outline the present-day stress regime in this region using the fault plane solutions of the largest events recorded by the Syrian National Seismological Network from 1995 to 2011. A dataset of fault-plane solutions was obtained for 48 events having at least 5 P-wave polarities. The tectonic regime for most of these events is extensional and produces normal mechanisms in agreement with the local configurations of the seismogenic faults in the region. Strike-slip mechanisms are more scarce and restricted to certain areas, such as the northern extension of the Dead Sea fault system. The results of the current study reveal the spatial variations in the orientation of maximum horizontal stress (SHmax) across the northwestern Syria region. These variations highlight the role of main geometrically complex shear zones in the present-day stress pattern of This region. However, these results, regardless of the relatively small magnitude of the studied events, provide a picture of the local stress deviations that have currently been taking place along the local active faults.

Palavras-chave : fault plane solutions; tectonic regime; coastal region; Syria.

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