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Article Dans Une Revue The Seismic Record Année : 2023

The destructive earthquake doublet of February 6, 2023, in south-central Türkiye and northwestern Syria: initial observations and analyses

Ulaş Avşar

Résumé

On February 6, 2023, two large earthquakes, magnitude 7.8 and 7.6, rocked south-central Türkiye and northwestern Syria. At the time of writing, the death toll exceeded 50,000 in Türkiye and 7,200 in Syria. The epicenter of the first mainshock was located ~15 km east of the East Anatolian Fault (EAF), the second large earthquake (9 hours later) initiated ~90 km to the north, on the east-west trending Sürgü Fault. Aftershocks delineate fault lengths of ~350 km and ~170 km, respectively. Using seismic and satellite data for first-order analyses of surface-fault offsets, space-time rupture evolution, and recorded ground-motions, our study sheds light on the reasons for the extensive 2 destruction. The first event ruptured the EAF bilaterally, lasted for ~80 sec and created surface fault offsets of over 6 m. The second event also ruptured bilaterally, with a duration of ~35 sec and more than 7 m surface offsets. Horizontal ground accelerations reached locally up to 2g in the first mainshock; severe and widespread shaking occurred in the Hatay-Antakia area with values near 0.5g. Both earthquakes are characterized by directivity effects and abrupt rupture cessation generating stopping phases that contributed to strong seismic radiation. Shaking was further aggravated locally by site-amplification effects.
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Dates et versions

hal-04287637 , version 1 (15-11-2023)

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P. Martin Mai, Theodoros Aspiotis, Tariq Anwar Aquib, Eduardo Valero Cano, David Castro-Cruz, et al.. The destructive earthquake doublet of February 6, 2023, in south-central Türkiye and northwestern Syria: initial observations and analyses. The Seismic Record, 2023, 3 (2), pp.105-115. ⟨10.1785/0320230007⟩. ⟨hal-04287637⟩
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