Preliminary documentation of coseismic ground failure triggered by the February 6, 2023 Türkiye earthquake sequence

Tolga Görüm*, Hakan Tanyas, Furkan Karabacak, Abdüssamet Yılmaz, Serkan Girgin, Kate E. Allstadt, M. Lütfi Süzen, Paula Burgi

*Bu çalışma için yazışmadan sorumlu yazar

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13 Atıf (Scopus)

Özet

The devastating Kahramanmaraş earthquake sequence occurred on February 6, 2023. Two main events, Mw 7.8 and Mw 7.5 occurred 9 hours apart, affected 11 cities in Turkey, and subjected an area of ∼90,000 km2 to shaking levels known to trigger landslides (peak ground acceleration > 0.08 g). Extensive landsliding was expected given the hilly terrain affected by this significant ground shaking—about 15% of the topography is steeper than 20°—but was not initially apparent in early satellite imagery, mostly because of obscuring snow that fell just after the earthquakes. However, after a more detailed investigation using high-resolution satellite images, aerial photos, and a field survey, we confirmed that this earthquake sequence did, indeed, trigger numerous landslides. In this study, we present those findings and provide a preliminary characterization of the spatial distribution, general characteristics, and dominant types of landslides and hillslope deformation triggered by the earthquake sequence. We mapped 3673 coseismic landslides, mostly concentrated in the northern half of the impacted area. Rock falls are the most abundant landslide type, but bedrock rotational landslides, translational slides and lateral spreads are also numerous. Surface rupture through mountainous terrain caused several large, and in some cases fatal, landslides. Incipient landslides and ground cracks are also widespread, especially in the north. Lithology, spatial variability of ground shaking, and topographic relief appear to be the main variables controlling the spatial distribution of coseismic landslides. There are few detailed studies of earthquake-triggered landslides in arid and semi-arid regions such as this one, nor for such complex earthquake sequences. Therefore, this contribution provides valuable information for future hazard and modeling efforts in arid and semi-arid regions.

Orijinal dilİngilizce
Makale numarası107315
DergiEngineering Geology
Hacim327
DOI'lar
Yayın durumuYayınlandı - 20 Ara 2023

Bibliyografik not

Publisher Copyright:
© 2023 The Authors

Finansman

This work was funded by the NATO Science for Peace and Security Program (SPS project G6190 ), Foundation for the Development of ITU, University of Twente , the Department of Applied Earth Science of ITC , the U.S. Geological Survey and the U.S. Agency for International Development (USAID) Bureau of Humanitarian Assistance .

FinansörlerFinansör numarası
Bureau of Humanitarian Assistance
Department of Applied Earth Science
Foundation
NATO Science for Peace and Security Program
United States Agency for International Development
U.S. Geological Survey
International Technological University
University of Twente
Saudi Pharmaceutical SocietyG6190

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