Akademik Veri Yönetim Sistemi
LATİN AMERİKA 10. ULUSLARARASI BİLİMSEL ARAŞTIRMALAR KONGRESİ, Habana, Küba, 1 - 04 Mayıs 2025, ss.1-8, (Tam Metin Bildiri)
The Anatolian Plate on
the Alpine-Himalayan Orogenic Belt is the most active belt following the
Pacific Seismic Belt and is recognized for its earthquakes characterized by
transform faulting mechanisms. In recent years, strong/destructive earthquakes such
as the 1999 İzmit earthquake (Mw = 7.6), the 2020 Elazığ earthquake (Mw=6.8),
and the 2023 Kahramanmaraş earthquakes (Mw=7.7 and Mw=7.6) have occurred notable
along the North Anatolian Fault Zone (NAFZ) and the East Anatolian Fault Zone
(EAFZ). Besides these primary fault zones, the relative movements of the
Arabian, Eurasian, and Anatolian Plates in the Eastern Anatolia region, along
with the deformation of the Bitlis-Zagros Suture Zone, contribute to additional
tectonic activity and seismicity in this region. The October 23, 2011, Van
earthquake (Mw=7.2) and its ongoing aftershocks underscore significant tectonic
activity linked to the compression regime that developed east of Lake Van
basin. While the western part of the Lake Van basin might not be as prominent
as the eastern part, it still contains fault and fault zones capable of
generating significant medium-magnitude earthquakes. In this context, the
September 25, 2024, Yumrukaya-Tatvan earthquake (Mw = 4.6) serves as a critical
indicator for understanding the seismicity of Bitlis province and its
surrounding areas. This earthquake occurred near the Kavakbaşı fault,
displaying a strike-slip mechanism. However, the General Directorate of Mineral
Research and Exploration’s active fault map shows no active fault and fault
zone at the epicenter of the Yumrukaya-Tatvan earthquake (Mw = 4.6). This study
analyzes the epicenter locations of the September 25, 2024, earthquake and its
aftershocks, examines the Coulomb stress transfer map, and assesses the b-value
change that illustrates the relationship between magnitude and earthquake
frequency to identify the fault in the region associated with the Yumrukaya-Tatvan
earthquake. Regionally, small b-values
(<0.8) were observed in the north of the South Anatolian Thrust Belt,
Muş Fault Zone, and west of Van Lake. Positive stress transfer, focal mechanism solutions of earthquakes, and
the directions of earthquake epicenters indicate a movement from the Kavakbaşı
fault in the west toward the South Anatolian Thrust Belt in the east/southeast.
Therefore, the Yumrukaya-Tatvan earthquake is a crucial indicator for
predicting the future seismicity of the region.