Volkan Özbey

• Doctor of Philosophy
• Research Assistant at Istanbul Technical University

This study evaluates the performance of multi-constellation GNSS Precise Point Positioning (PPP) for offshore kinematic observations in the challenging environment of Antarctica using the data collected on a moving ship during the 6th Turkish Antarctic Expedition in 2022. The analysis involved two open-source PPP software solutions, PRIDE PPP-AR, a...

This study addresses the potential of machine learning (ML) algorithms in geophysical and geodetic research, particularly for enhancing GNSS time series analysis. We employed XGBoost and Long Short-Term Memory (LSTM) networks to analyze GNSS time series data from the tectonically active Anatolian region. The primary objective was to detect disconti...

Triple junctions involving convergent plate boundaries extend beyond local implications, which is crucial for studying the geology of convergent plate boundary zones. However, kinematic models overlook Cyprus-Anatolia motion due to limited geodetic constraints. Our study area comprises Cyprus, southern Turkey, and the Levant coast, focusing on the...

The North Anatolian Fault (NAF) is a one of the major dextral strike-slip faults of Turkey which forming the boundary between the Eurasian - Anatolian plates. From 1939 to 1999, significant earthquakes occurred as showing a westward migration. Several studies are being conducted due to this seismic activity along the NAF. However, none of these are...

We use GPS and InSAR data to examine the present-day kinematics of the Tuz Gölü Fault Zone with a view to documenting an ‘intra-plate-like’ behaviour within a highly active plate boundary zone. In order to generate the strain rate field of the region, we utilize two different approaches. Both of the approaches reveal that the area has a shear-domin...

The Gulf of Gökova is one of the earthquake-prone areas in the Aegean Sea and southwestern Turkey. The paleoseismology of the region is not well known because of the lack of robust field data. In this study, we focused on marine tidal notches as geomorphic markers of modern and paleoseismic deformations. Our geomorphic surveys suggest that the 20 J...

GNSSpy is a free and open source library for handling multi-GNSS and different versions (2.x and 3.x) of RINEX files. It performs basic Precise Point Positioning (PPP) algorithms to calculate coordinates of the GNSS stations precisely. Therefore, the Multi-GNSS Experiment (MGEX) products are used within the package. It also calculates the ionospher...

Seismological studies on the western part of the North Anatolian Fault (NAF) revealed the possibility that it may constitute a bimaterial interface at various locations. One evidence for this came from Karadere and Mudurnu segments where Fault Zone Head Waves (FZHW) and Fault Zone Reflected Waves (FZRW) indicated bimaterial interfaces and damage zo...

The Sea of Marmara has been the focus of numerous marine geophysical studies during the last couple of decades. Determination of the interseismic slip distribution along the Main Marmara Fault (MMF) has observational difficulties due to the fact that the fault is under the sea. In addition to the onshore geodetic studies, two underwater geodetic st...

The interseismic slip distribution in the Marmara fault system represents both observational and modelling challenges. The observational challenge is obvious: the faults are under water and to understand their interseismic behavior (creeping versus locked) requires expensive and logistically difficult underwater geodetic measurements, alongside tho...

Gökova Gulf is located between Datça and Bodrum peninsulas at the SW part of Turkey. It is one of the most seismically active domain of the Agean Sea. The northern coast of the gulf is delimited by normal fault segments of the Gökova Fault Zone. The sea bottom topography of the gulf is delimited by the low-angle offshore Datça Fault in the south an...

Gökova Gulf is located between Datça and Bodrum peninsulas at the SW part of Turkey. It is one of the most seismically active domain of the Agean Sea. The northern coast of the gulf is delimited by normal fault segments of the Gökova Fault Zone. The sea bottom topography of the gulf is delimited by the low-angle offshore Datça Fault in the south an...

Gökova Bay is located in the south Aegean Sea and is one of the most seismically accve regions in Western Turkey. One of the challenging aspects of the seismic hazard assessments in the region is the offshore faults. There is almost no informaon about their paleoseismic accviies. In contribuuon, we carried out fieldwork along the shorelines of the...

Gökova Bay is one of the most seismically active regions in the western Anatolia. The latest example of this seismicity is 21 July 2017 Bodrum (Mw:6.6) Earthquake. This earthquake was an offshore earthquake, which had the potential to create coseismic deformation along the shoreline. To check this out we carried out fieldwork in the Bodrum and Kara...

Gökova Bay is one of the most seismically active regions in the western Anatolia. Either historical or instrumental periods records reveal the presence of an intense seismic activity in the sea floor of the bay. The latest example of this activity is 21 July 2017 Bodrum (Mw:6.6) Earthquake. Our knowledge about paleoseismology of the large faults th...

Gökova Körfezi, güney Ege’nin depremsellik açısından en canlı bölgelerinden biridir. 21 Temmuz 2017 tarihinde büyüklüğü Mw:6.6 olan Bodrum Depremi bu canlılığın en son örneğidir. Bununla beraber bölgenin özellikle denizaltı depremleri ile ilişkili olarak paleosismolojisi bilinmemektedir. Bu çalışmada Gökova Körfezi’nin güney ve kuzey kıyıları boyun...

Every man-made structure creates certain risks — dams are no exception. Most failures in man-made structures that have occurred could have been avoided if the structures’ behaviour had been inspected, monitored, and analyzed continuously, and if proper corrective measures had been taken in a timely fashion. The DSI (The General Directorate of State...