Akademik Veri Yönetim Sistemi
8th ICEGE Conference on Earthquake Geotechnical Engineering , Osaka, Japonya, 7 - 10 Mayıs 2024, ss.1
Türkiye
lies at the junction of three tectonic plates which drives the significant
seismicity of the region. The mainshock event of M7.8 occurred on a
portion of the plate boundary East Anatolian Fault and was followed
approximately 9 hours later by a M7.7 aftershock on the Sürgü - Çardak
Fault. Surface fault rupture of these
two events extends over a distance of roughly 460 km, with both ruptures
presenting typical left-lateral strike-slip geomorphology and surface rupture
patterns. The investigation as part of the Geotechnical Extreme Events
Reconnaissance teams included a regional assessment of the impacts to
infrastructure (i.e., bridges, pipelines) as well as documentation of the
geological effects (surface fault rupture, liquefaction, lateral spread,
landslides). Here we present observations on rupture terminations and surface
slip measurements along the M7.8 rupture and the M7.7 rupture.
Left-lateral surface displacements along the M7.8 EAF rupture were
remarkably consistent, 3 to 4 m, but diminished to the south near Antakya to
around 0.5 m. The M7.7 event produced the largest recorded surface
displacements of consistent 7 to 8 m left-lateral offsets. Along both ruptures,
the surface trace followed tectonic geomorphic features that would have been
recognized in pre-rupture mapping such as linear swales, saddles, and side-hill
benches. However, in other areas the ruptures are expressed by breaks across
the tops of shutter ridges, through bedrock knobs, and complex arrays of
en-echelon pressure ridges.