Akademik Veri Yönetim Sistemi
INTERNATIONAL CONFERENCE COMMEMORATING THE 2023 KAHRAMANMARAS-TURKIYE EARTHQUAKES, Adıyaman, Türkiye, 06 Şubat 2025, ss.1, (Özet Bildiri)
On February 6, 2023, two
strong (Mw=7.7 and Mw=7.6) and shallow (h=8.9 km and h=7.7 km) earthquakes with
an interval of ~9 hours were struck in the Pazarcık and Elbistan
(Kahramanmaraş) provinces in southern Türkiye, respectively. The first mainshock
occurred at 01:17:32 (UTC) and the second mainshock occurred at 10:24:47 (UTC).
The focal mechanism solutions of these doublet earthquakes demonstrated the
left lateral strike-slip fault mechanisms with 310 km and 150 km surface
ruptures, respectively. According to the earthquake catalogue of the Disaster
and Emergency Management Authority (AFAD), approximately 230 aftershocks were
recorded between the time interval of two mainshocks, 13 of which were magnitude
greater than M≥5.0. It is important to note that 11 aftershocks with a
magnitude greater than M≥5.7 have occurred and the region has experienced
approximately 70,000 aftershocks from 6 February 2023 to today. In general, the
focal mechanisms of these heavy aftershocks demonstrated the left-lateral
strike-slip mechanisms response to the East Anatolian Fault Zone (EAFZ) and
Dead Sea Fault Zone (DSFZ). These
great mainshock doublets with mass aftershocks affected 11 cities called Hatay, Kahramanmaraş, Adıyaman, Malatya, Osmaniye,
Gaziantep, Kilis, Şanlıurfa, Diyarbakır, Adana and Elazığ provinces. Therefore,
approximately 240,000 buildings were damaged, ~60,000
people died, and ~115,000 people were injured in these cities.
This study conducted the
seismotectonic characterization of the 6 February 2023 Pazarcık and Elbistan mainshocks
and their aftershock propagations using the Coulomb stress change, potential
field anomaly, b-value distribution, and aftershock clusters. Also, we
made a seismotectonic review using the horizontal displacements of the focal
mechanism solutions of the main shocks and their large aftershocks. The
aftershock clustering can be observed along the EAFZ, especially related to the
Pütürge, Erkenek, and Pazarcık segments and the Doğanşehir fault zone in the north
and northeast directions. Besides, the south and southwest-oriented aftershock
zone extends to the Yumurtalık and Amanos segments with the Ecemiş fault. On
one hand, the present-day Coulomb stress variations support these directions,
especially in shallow depths. In the tectonic stress field maps, the mainshocks have caused the positive stress transfer
between Elazığ and Malatya provinces in the northeast, Kahramanmaraş-Göksun province
in the west, and Hatay province in the south. On the other hand, shallow
aftershocks are associated with high-gravity anomalies. According to the
analysis of b-value distribution, the low b-values are identified in the northeast and southwest sections of EAFZ.
Finally, we
can deduce that the observed parameters indicate upcoming seismicity in the
intermediate and long term in both the northeast and southwest directions of
the EAFZ.