TÖ

Taylan Öcalan

Yıldız Technical University

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Nursu Tunalıoğlu

Yıldız Technical University

Tuncay Taymaz

Istanbul Technical University

Ali Hasan Doğan

Yıldız Technical University

Seda Yolsal‐Çevikbilen

Istanbul Technical University

Bahattin Erdoğan

Yıldız Technical University

Tuna Eken

Istanbul Technical University

Ceyhun Erman

Istanbul Technical University

Diego Melgar

University of Oregon

Cemali Altuntaş

Yıldız Technical University

Brendan W. Crowell

University of Washington

Cooperative Institutions

Yıldız Technical University

United States Geological Survey

Geologic Hazards Science Center

Denver Federal Center

Istanbul Technical University

National Observatory of Athens

Afyon Kocatepe University

University of Patras

Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences

United States Department of the Interior

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Tectonic activity inferred from velocity field of GNSS measurements in Southwest of Turkey

Acta Geodaetica et Geophysica (2013)

Engīn Gülal İbrahim Tiryakioğlu Saffet Erdoğan Nedim Onur Aykut Tamer Baybura

10.1007/s40328-012-0005-1

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Citations (14)

Datum Alignment Between GNSS-IR Sea Level Estimations and Tide Gauges in Türkiye: A Vertical Local Tie Approach

Marine Geodesy (2024)

Cemali Altuntaş Nursu Tunalıoğlu Taylan Öcalan

Tide gauge

Ocean tide

10.1080/01490419.2024.2402008

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Citations (0)

Usability of the GPS Precise Point Positioning Technique in Marine Applications

Journal of Navigation (2013)

Reha Metin Alkan Taylan Öcalan

This study investigates the accuracy of an online Precise Point Positioning (PPP) service operated by the Geodetic Survey Division of Natural Resources Canada (NRCan), Canadian Spatial Reference System (CSRS)-PPP, by using single/dual-frequency Global Positioning System (GPS) data collected by dual-frequency geodetic-grade and Original Equipment Manufacturer (OEM) board type single-frequency GPS receivers. In this work, a kinematic test was carried out in Halic Bay (Golden Horn), Istanbul, Turkey, to assess the performance of the PPP method in a dynamic environment. Based on this study, it can be concluded that the coordinates estimated from the online CSRS-PPP service have a potential of about metre-level accuracy by processing single frequency data collected by an OEM receiver and about a decimetre to a few centimetres level accuracy by processing dual frequency data collected by a geodetic-grade receiver. In general, results show that the PPP technique has become a significant alternative to the conventional relative (differential) positioning techniques (i.e., Differential GPS (DGPS), Real-time Kinematic (RTK)). The technique does not suffer from the drawbacks of the DGPS technique and has potential to provide the same position accuracy without the requirement for a reference station. Consequently, it has been concluded that the PPP technique may be effectively used in marine applications due to its ease of use and provision of high accuracy, as well as being able to offer reduced field operational costs.

Real Time Kinematic

Precise Point Positioning

Differential GPS

10.1017/s0373463313000210

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Citations (38)

The 2017 Lesvos (Greece) Mw6.3 earthquake: Normal faulting in the Aegean Sea

EGUGA (2018)

Tuncay Taymaz Vasso Saltogianni Seda Yolsal‐Çevikbilen Michail Gianniou Taylan Öcalan

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Source Mechanism and Rupture Process of the 24 January 2020 Mw 6.7 Doğanyol–Sivrice Earthquake obtained from Seismological Waveform Analysis and Space Geodetic Observations on the East Anatolian Fault Zone (Turkey)

Tectonophysics (2021)

Tuncay Taymaz Athanassios Ganas Seda Yolsal‐Çevikbilen Felipe Vera Tuna Eken

Hypocenter

Focal mechanism

Seismic moment

10.1016/j.tecto.2021.228745

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Citations (79)

A two-stage Kalman filtering approach using GNSS and smartphone sensors for seismogeodetic applications

Advances in Space Research (2022)

Caneren Gül Taylan Öcalan

Root mean square

10.1016/j.asr.2022.12.007

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Citations (1)

Precise Point Positioning with GNSS Raw Measurements from an Android Smartphone in Marine Environment Monitoring

Marine Geodesy (2022)

Nursu Tunalıoğlu Taylan Öcalan Ali Hasan Doğan

Precise Point Positioning

Android application

10.1080/01490419.2022.2027831

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Citations (7)

Determination of Snow Depth Using Reflected GPS Signals

EGU General Assembly Conference Abstracts (2018)

Nursu Tunalıoğlu Ali Hasan Doğan Utkan Mustafa Durdağ Bahattin Erdoğan Taylan Öcalan

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

Seismica (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

Source model

10.26443/seismica.v2i3.387

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Citations (152)

Rapid Characterization of the February 2023 Kahramanmaraş, Türkiye, Earthquake Sequence

The Seismic Record (2023)

D. Goldberg Tuncay Taymaz Nadine G. Reitman Alexandra E. Hatem Seda Yolsal‐Çevikbilen

Abstract The 6 February 2023 Mw 7.8 Pazarcık and subsequent Mw 7.5 Elbistan earthquakes generated strong ground shaking that resulted in catastrophic human and economic loss across south-central Türkiye and northwest Syria. The rapid characterization of the earthquakes, including their location, size, fault geometries, and slip kinematics, is critical to estimate the impact of significant seismic events. The U.S. Geological Survey National Earthquake Information Center (NEIC) provides real-time monitoring of earthquakes globally, including rapid source characterization and impact estimates. Here, we describe the seismic characterization products generated and made available by the NEIC over the two weeks following the start of the earthquake sequence in southeast Türkiye, their evolution, and how they inform our understanding of regional seismotectonics and hazards. The kinematics of rupture for the two earthquakes was complex, involving multiple fault segments. Therefore, incorporating observations from rupture mapping was critical for characterizing these events. Dense local datasets facilitated robust source characterization and impact assessment once these observations were obtained and converted to NEIC product input formats. We discuss how we may improve the timeliness of NEIC products for rapid assessment of future seismic hazards, particularly in the case of complex ruptures.

Sequence (biology)

10.1785/0320230009

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Citations (76)