Tahir Serkan Irmak

Kocaeli Üniversitesi

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Tuncay Taymaz

Istanbul Technical University

Ceyhun Erman

Istanbul Technical University

Tuna Eken

Istanbul Technical University

Evrim Yavuz

Istanbul Metropolitan Municipality

Hamdullah Livaoğlu

Kocaeli Üniversitesi

Seda Yolsal‐Çevikbilen

Istanbul Technical University

Peter Dokukin

Peoples' Friendship University of Russia

Mustafa Toker

Van Yüzüncü Yıl Üniversitesi

Bülent Doğan

University of Houston

BÖ

Berkan Özkan

Istanbul Technical University

Cooperative Institutions

Peking University

Kocaeli Üniversitesi

United States Geological Survey

Geologic Hazards Science Center

Istanbul Technical University

Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences

Denver Federal Center

Boğaziçi University

University of Potsdam

Kandilli Observatory and Earthquake Research Institute

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Source Rupture Process of October 31, 2002 and November 1, 2002 Italy Earthquakes inferred from Inversion of Teleseismic Body-waveforms

EAEJA (2003)

Tahir Serkan Irmak Mehmet Özer Tuncay Taymaz Onur Tan

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Source Geometry and Rupture Characteristics of the 20 February 2023 Mw 6.4 Hatay (Türkiye) Earthquake at Southwest Edge of the East Anatolian Fault

Geochemistry Geophysics Geosystems (2024)

Seda Yolsal‐Çevikbilen Tuncay Taymaz Tahir Serkan Irmak Ceyhun Erman Metin Kahraman

Abstract Following the catastrophic 6 February 2023 Mw 7.8 and Mw 7.6 Kahramanmaraş earthquakes in the East Anatolian Fault Zone (EAFZ; southeast Türkiye), numerous aftershocks occurred along the major branches of this left‐lateral shear zone. The spatio‐temporal distribution of the earthquakes implied the stress‐triggering effects of co‐seismic ruptures on closely connected fault segments over large distances. On the 20 February 2023 two earthquakes with Mw 6.4 and Mw 5.2 struck Hatay (Türkiye) located near the Samandağ‐Antakya segment of the EAFZ. To understand the rupture evolution of these earthquakes, we first re‐located the aftershock sequence that occurred over a 3‐month period in the Hatay‐Syria region. A normal faulting mechanism with a significant amount of left‐lateral strike‐slip component at a shallow focal depth of 12 km was estimated for the 2023 Mw 6.4 earthquake from the inversion of seismological data. Our slip models describe a relatively simple and unilateral rupture propagation along about 36 km‐long active segments of the EAFZ. The co‐seismic horizontal displacements inferred from the Global Navigation Satellite System data are compatible with the oblique slip kinematics. Furthermore, we suggest that this earthquake did not produce notable tsunami waves on the adjacent coasts since the rupture plane did not extend to the seafloor of the Eastern Mediterranean with substantial amount of vertical displacement. We reckon that a future large earthquake (Mw ≥ 7.0) in the Hatay‐Syria region where increased stress was transferred to the fault segments of the EAFZ and the Dead Sea Fault Zone (DSFZ) after the 2023 earthquakes will be a probable source of tsunami at the coastal plains of the Eastern Mediterranean Sea region.

North Anatolian Fault

10.1029/2023gc011353

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An empirical relationship between seismic bedrock depth and fundamental frequency for Değirmendere (Kocaeli-Turkey)

Environmental Earth Sciences (2017)

Hamdullah Livaoğlu Tahir Serkan Irmak

Bedrock

Microtremor

Overburden

Seismic Noise

Seismic refraction

10.1007/s12665-017-7025-7

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Citations (9)

Sub- and super-shear ruptures during the 2023 Mw 7.8 and Mw 7.6 earthquake doublet in SE Türkiye

EarthArXiv (California Digital Library) (2023)

Diego Melgar Tuncay Taymaz Athanassios Ganas Brendan W. Crowell Taylan Öcalan

An earthquake doublet (Mw 7.8 and Mw 7.6) occurred on the East Anatolian Fault Zone (EAFZ) on February 6th, 2023. The events produced significant ground motions and caused major impacts to life and infrastructure throughout SE Türkiye and NW Syria. Here we show the results of earthquake relocations of the first 11 days of aftershocks and rupture models for both events inferred from the kinematic inversion of HR-GNSS and strong motion data considering a multi-fault, 3D geometry. We find that the first event nucleated on a previously unmapped fault before transitioning to the East Anatolian Fault (EAF) rupturing for ~ 350 km and that the second event ruptured the Sürgü fault for ~ 160 km. Maximum rupture speeds were estimated to be 3.2 km/s for the Mw 7.8 event. For the Mw 7.6 earthquake, we find super-shear rupture at 4.8 km/s westward but sub-shear eastward rupture at 2.8 km/s. Peak slip for both events were as large as ~8m and ~6m, respectively.

North Anatolian Fault

10.31223/x52w9d

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Citations (18)

Evolution of the crustal inner displacement deficit in a reference to Elazig earthquake series just before occurring the devastate Ekinozu-Nuradagi earthquakes (M7.5–7.8, 2023-02-06)

Peter Dokukin M. A. Guvenaltin Tahir Serkan Irmak В. И. Кафтан Mustafa Toker

P. A. Dokukin1, M. A. Guvenaltin2, T. S. Irmak3, V. I. Kaftan4, M. Toker5 1 People's Friendship University of Russia, Moscow, Russia2 Hacettepe University, Ankara, Turkey3 Kocaeli University, Izmit, Turkey4 Geophysical Center RAS,

Center (category theory)

10.2205/esdb-ekinozu-nurdagi-quakes

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22.01.2020 Akhisar-Manisa Depremi (Mw 5.5) ve Artçılarının Sismotektonik Analizi

Türk Deprem Araştırma Dergisi (2020)

Tahir Serkan Irmak Bülent Doğan Evrim Yavuz Hamdullah Livaoğlu Fadime Sertçelik

Bu çalışmada, 22 Ocak 2020 Akhisar-Manisa (Mw 5.5) depremi ve artçılarının odak mekanizması çözümleri dalga şekli ters çözümü ile elde edilmiş ve buna göre sismotektonik yorum yapılmıştır. Bu amaçla, ana şok ve 35 artçı depremin odak mekanizması çözümleri ISOLA algoritması ile elde edilmiştir. Depremlerin odak mekanizması çözümlerinin çoğunluğu, bölgenin genişleme tektoniği ile uyumlu olup, normal faylanma ve az miktarda doğrultu atım bileşeni olan normal faylanma veya normal faylanma bileşeni olan doğrultu atımlı faylanma özelliğine sahiptir. Analizi yapılan depremlerin odak derinlikleri 4-15 km arasında değişmektedir. Gerilme tensörü ters çözümüne göre; bölge açılma rejiminin (R’=0.75) etkisi altındadır ve KD-BG yönünde açılmaktadır. Açılma hızı 1.3 mm/yıl olarak hesaplanmıştır. Bölgede minimum basınç ekseni (σ3), K21oD olarak yönlenmiştir. Asal gerilme eksenlerinin bölgedeki konumları sırasıyla σ_1, σ_2, ve σ_3 olmak üzere 74o /111o, 16o/291o ve 0o/201o (eğim/azimut) olarak hesaplanmıştır. Bu stres dağılımlarına göre depremlerin üzerlerinde meydana geldiği fay düzlemleri, gerilmeli tektonik kabuk deformasyonunu işaret etmektedir.

10.46464/tdad.730335

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Present-Day Stress Field in the Bala – Ankara (Turkey) Region from Inversion of Focal Mechanisms

DergiPark (Istanbul University) (2016)

Tahir Serkan Irmak

The focal mechanisms of the small-moderate earthquakes occurring in the brittle part of the crust are the expression of the present regional stress field and how these stresses act on existing structures in the crust. Especially for the middle and lower crust, for which borehole measurements are not possible, the analysis of focal mechanisms is the only tool for in-situ stress measurements. For this reason, the focal mechanisms of the 2007-2008 earthquakes (23 earthquakes) are obtained from both first motion analysis of vertical P waves (4 earthquakes) and time domain regional body waveforms inversion (19 earthquakes). Using other sources in total 37 earthquake focal mechanisms were obtained to determine active tectonics and the present-day stress field in the Bala-Ankara region. The focal mechanism of the analyzed earthquakes occurred in the Bala-Ankara region obtained both from first motion analysis and time domain moment tensor analysis indicate that the predominant earthquake mechanism is the strike-slip mechanism. All earthquakes occur at shallow depths. Only two events occur at 26 km and 36 km depths. The slip rate is calculated as 0.83 mm/year. The state of recent stress and ongoing deformation in Bala-Ankara region is primarily controlled by the north-northwest drift of the African and Arabian plates respectively. In terms of stress orientations, the Bala-Ankara region is affected by stresses with a general NW-SE orientation of horizontal maximum principal axis ( S Hmax N169 o E) and NE-SW orientation of minimum principal axis ( S Hmin N79 o E). However, the extensional features (a few normal faulting focal mechanisms) are observed and these features reflect local stress inhomogeneous compared to the regional stress which is strike-slip.

Focal mechanism

Stress field

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