Semih Ergintav

Semih Ergintav
Bogazici University, Kandilli Observatory and Earthquake Research Institute · Geodesy

PhD

About

215
Publications
58,938
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
8,154
Citations
Citations since 2016
66 Research Items
3873 Citations
20162017201820192020202120220200400600
20162017201820192020202120220200400600
20162017201820192020202120220200400600
20162017201820192020202120220200400600

Publications

Publications (215)
Article
The Anatolia–Aegean domain represents a broad plate boundary zone, with the deformation accommodated by major faults bounding quasi-low deforming units. First-order features of this deformation were obtained in the form of a GNSS-derived velocity field. During the last decade, the accuracy of velocity solutions was improved, and the expansion of co...
Article
The recently observed slow transients in the Sea of Marmara are important to quantify the seismic hazard and risk for the greater Istanbul metropolitan region. In this study, we analyze and characterize a slow slip event that occurred in the Eastern Sea of Marmara in 2016. To characterize the temporal history and the location of this event, we comb...
Article
The Near Fault Observatories (NFOs) community is one of the European Plate Observing System (EPOS, http://www.epos-eu.org) Thematic Communities, today consisting of six research infrastructures that operate in regions characterised by high seismic hazard originating from different tectonic regimes. Earthquakes respond to complex natural systems who...
Conference Paper
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...
Conference Paper
In order to improve our understanding of the present-day continental deformation in the Iranian-Turkish plateau we map the surface motions across the Iranian-Turkish boundary between Ardabil (NW Iran) and Van (E Turkey) using Sentinel-1 satellites’ TOPSAR data between 2014 and 2021 on descending (6, 79, 152) and ascending (101, 174 and 72) tracks....
Article
Full-text available
The 150‐km seismic gap in the Sea of Marmara is the longest section of the North Anatolian Fault that has not ruptured in the last century. Recent geodetic studies suggest that the interseismic coupling along the Main Marmara Fault (MMF) is heterogeneous with locked and creeping segments. Alternatively, the MMF is fully locked, but the strain is lo...
Article
Full-text available
The East Anatolian Fault (EAF) is a 700 km long left-lateral transform fault located between the Anatolian and Arabian plates. The proximity of the Euler Pole to the Arabia-Anatolia plate boundary leads to rapid changes in plate velocity along the boundary, which is manifested by the decreasing slip rates from east (10 mm/yr) to west (~1-4 mm/yr)....
Article
The East Anatolian Fault (EAF) is a 700 km long left-lateral transform fault located between the Anatolian and Arabian plates. The proximity of the Euler Pole to the Arabia-Anatolia plate boundary leads to rapid changes in plate velocity along the boundary, which is manifested by the decreasing slip rates from east (10 mm/yr) to west (∼1-4 mm/yr)....
Article
Full-text available
The East Anatolian Fault (EAF) is a left‐lateral transform fault accommodating the relative motion between the Anatolian and Arabian plates. On January 24, 2020, Mw6.8 Sivrice (Elazığ) earthquake is the largest event that occurred along the EAF since the nineteenth century. The earthquake provides a unique opportunity to capture a critical stage of...
Poster
Full-text available
Man-made deformation activity is obscuring and interacting with natural tectonic processes in various places of the world. Here we monitor ground motions associated with faulting, landslides, and man-made activities in the Marmara region (western-most section of North Anatolian Fault). Using GMTSAR and StaMPs PSInSAR time-series, applied to Sentine...
Conference Paper
Full-text available
The Samos-Izmir Earthquake (Mw=6.9) of October 30, 2020 is among the strongest earthquakes that occurred in recent years throughout the Eastern Aegean. The epicenter of this earthquake was 14 km away from Samos Island and 25 km away from Gümüldür-İzmir region. The local tsunami with the wave heights reaching ~2m was triggered by the mainshock. The...
Article
Full-text available
In the Eastern Mediterranean, the convergence of Nubia and Eurasia is accommodated along the Hellenic and Cyprus Trenches. The plate geometry and mode of convergence to the east of the Hellenic Trench remains poorly understood. Specifically, along the west of Cyprus, tomography models reveal NW striking high velocity anomaly, which is interpreted a...
Article
In order to better assess earthquake hazards, it is vital to have a better understanding of the spatial and temporal characteristics of fault creep that occur on ruptured faults during the period following major earthquakes. Towards this end, we use new far-field GPS velocities from continuous stations (extending ∼50 − 70 km from the fault) and upd...
Article
The unbroken section of the North Anatolian Fault beneath the Sea of Marmara is a major source of seismic hazard for the city of İstanbul. The northern and currently the most active branch, the Main Marmara Fault (MMF), is segmented within a shear zone and exhibits both partially creeping and locked behaviour along its 150 km length. In 2019 Septem...
Poster
Full-text available
Recent GPS suggest that central section of the North Anatolian Fault (NAF) in Marmara Sea is creeping. It is known that creep on some segments of the NAF on land occurs as long-term post-seismic motion, affecting shallow parts of fault segments that slipped co-seismically, with the best observations coming from the 1999 M7.6 Izmit Earthquake. The l...
Article
Full-text available
On February 21, 2007, a moderate-sized (Mw 5.7) earthquake struck the town of Sivrice (Elazig, Turkey) located within the East Anatolian Fault (EAF) zone that forms the boundary between the Arabian and Anatolian plates. The earthquake source parameters of the mainshock reported by different agencies are significantly different. In the mean time, th...
Article
Full-text available
The 20 July 2017, Mw6.6 Bodrum-Kos Earthquake occurred in the Gulf of Gökova in the SE Aegean, a region characterized by N-S extension in the back-arc of the easternmost Hellenic Trench. The dip direction of the fault that ruptured during the earthquake has been a matter of controversy where both north and south-dipping fault planes were used to mo...
Article
Full-text available
Using offshore geodetic observations, we show that a segment of the North Anatolian Fault in the central Sea of Marmara is locked and therefore accumulating strain. The strain accumulation along this fault segment was previously extrapolated from onshore observations or inferred from the absence of seismicity, but both methods could not distinguish...
Article
Full-text available
Characterizing the spatio‐temporal evolution of creep is essential to constrain fault slip budget and understand creep mechanism. Studies based on Interferometric Synthetic‐Aperture Radar (InSAR) and Global Positioning System (GPS) satellite observations until 2012 have shown that the central segment of the August 17, 1999 Mw 7.4 Izmit earthquake o...
Conference Paper
Full-text available
Türkiye ve çevresindeki yoğun sismik aktivite, levha hareketleri sonucu çok sayıda levha içi aktif faylar, transform fay sistemleri ve dalma-batma kuşağı gibi ana tektonik yapılar tarafından kontrol edilmektedir. Bu sebep ile deprem tehlikesinin yüksek olduğu ülkemizde, deprem tehlike değerlendirme çalışmaları daha önce birçok kere farklı model ve...
Article
Full-text available
Turkey is located in one of the most seismically active regions in the world. Characterizing seismic source zones in this region requires evaluation and integration of geological, geophysical, seismological and geodetical data. This first seismotectonic database for Turkey presented herein was prepared, under the framework of the National Earthquak...
Article
Full-text available
Over the years, several local and regional seismic hazard studies have been conducted for the estimation of the seismic hazard in Turkey using different statistical processing tools for instrumental and historical earthquake data and modeling the geologic and tectonic characteristics of the region. Recently developed techniques, increased knowledge...
Article
Full-text available
A review on the historical evolution of seismic hazard maps in Turkey is followed by summarizing the important aspects of the updated national probabilistic seismic hazard maps. Comparisons with the predecessor probabilistic seismic hazard maps as well as the implications on the national design codes conclude the paper.
Article
The 23 October 2011 Mw 7.1 Van earthquake in eastern Turkey took place on a previously unknown thrust fault, causing over 600 fatalities and extensive damage mainly in Van city and the northern town of Erciş. Several coseismic models have already been published after the earthquake using the available seismological and geodetic data. These studies...
Article
Full-text available
We report that asperities with the highest coseismic slip in the 2014 MW6.9 North Aegean earthquake persisted through the interseismic, coseismic and immediate post-seismic periods. We use GPS and seismic data to obtain the source model of the 2014 earthquake, which is located on the western extension of the North Anatolian Fault (NAF). The earthqu...
Conference Paper
Full-text available
The determination of the slip budget is essential to estimate the seismic potential of faults. Studies based on Interferometric Synthetic-Aperture Radar (InSAR) and Global Positioning System (GPS) satellite observations until 2012 have shown that the central segment of August 17, 1999, Izmit earthquake on the North Anatolian Fault (NAF) began slipp...
Conference Paper
Full-text available
Identification and measurement of subsidence susceptibility in urban areas have a vital importance to determine vulnerable part of the cities prone to geohazards, which is crucial for sustainable urban planning and hazard mitigation. Interferometric synthetic aperture radar (InSAR) time series analysis is a very powerful tool for operational mappin...
Article
Full-text available
The identification and measurement of ground deformations in urban areas is of great importance for determining the vulnerable parts of the cities that are prone to geohazards, which is a crucial element of both sustainable urban planning and hazard mitigation. Interferometric synthetic aperture radar (InSAR) time series analysis is a very powerful...
Article
Full-text available
Semi-enclosed Marmara Sea is a passage between the Aegean Sea (Northeastern Mediterranean Sea) and the Black Sea. The Marmara Sea is connected to the Black Sea and the Aegean Sea through the İstanbul Strait (Bosphorus) and Çanakkale Strait (Dardanelles), respectively. Despite the fact that the late Pleistocene-Holocene connections between the seas...
Article
We report that asperities with the highest coseismic slip in the 2014 of MW6.9 North Aegean Earthquake persisted through the interseismic, coseismic and immediate postseismic periods. We use GPS and seismic data to obtain the source model of the 2014 earthquake, which is located on the western extension of the North Anatolian Fault (NAF). The earth...
Article
Full-text available
We utilize L-band interferometric synthetic aperture radar (InSAR) data in this study to retrieve a ground velocity map for the near field of the Ganos section of the north Anatolian fault (NAF) zone. The segmentation and creep distribution of this section, which last ruptured in 1912 to generate a moment magnitude (Mw)7.3 earthquake, remains incom...
Data
Raw data for cross GF velocity profiles. Surface displacement measured on the basis of the stacked profiles within boxe “A” in Fig 2. (XLSX)
Data
Example interferograms on the study region. From the 39 coherent ALOS PALSAR interferograms used in this study, we show examples of four representative interferograms spanning 690 days, 644 days, 322 days and 92 days. The full PALSAR frame is shown. The red rectangle represents the common area covering the GF (Figs 1 and 2) where the SAR signal is...
Data
Raw data for cross GF velocity profiles. Surface displacement measured on the basis of the stacked profiles within boxe “B” in Fig 2. (XLSX)
Chapter
GIRIŞ Doğu Akdeniz güncel levha hareketlerinin meydana geldiği bir bölgedir (Şekil 6.1). Bölgedeki levha hareketleri Geç Kretase döneminden günümüze değin güney Neotetis Okyanusu'nun kapanmasına yol açan Arap-Afrika levhaları ile Avrasya levhası arasındaki yakınsama süreciyle ilişkilidir (Mc Kenzie, 1972, 1978; Şengör ve Yılmaz, 1981). Neotetis Oky...
Chapter
Full-text available
GIRIŞ Türkiye Alp-Himalaya Sıradağı içinde Doğu Akdeniz bölgesinde bulunur. Batı Avrupa’dan Asya’ya yaklaşık 9 bin km uzunluktaki bu sıradağın oluşumu günümüzde de devam etmektedir. Bu oluşum sırasında meydana gelen tektonik olaylar nedeniyle Alp-Himalaya Sıradağı dünyanın en aktif deprem kuşaklarından birisidir. Türkiye’nin sismotektonik özellikle...
Conference Paper
In line with the development of a new seismic design code for Turkey, the need also aroused for an updated national seismic hazard map, leaving the approach of seismic zoning to define the earthquake loads, which was adopted in connection with the 1997 and 2007 versions of the seismic design code and moving towards the concept of design spectra tha...
Poster
Full-text available
Near Fault Observatories (NFOs) are innovative research infrastructures based on dense, state of the art networks of multi-parametric sensors that continuously monitor the underlying Earth instability processes over a broad time interval. They aim at understanding the physical/chemical processes responsible for earthquakes and faulting and tracking...
Conference Paper
Twice in the past 1000 years a sequence of large earthquakes has propagated from east to west along the North Anatolian fault (NAF) in Turkey towards Istanbul, with the final earthquake in the sequence destroying the city. This occurred most recently in 1509. The population of greater Istanbul is 20 million and the next large earthquake of the curr...
Article
The aims of this study are to estimate soil attenuation using alternatives to traditional methods, to compare results of using these methods, and to examine soil properties using the estimated results. The performances of all methods, amplitude decay, spectral ratio, Wiener filter, and artificial neural network (ANN) methods, are examined on field...
Article
Full-text available
Strike-slip faults may be traced along thousands of kilometers, e.g., the San Andreas Fault (USA) or the North Anatolian Fault (Turkey). A closer look at such continental-scale strike faults reveals localized complexities in fault geometry, associated with fault segmentation, secondary faults and a change of related hazards. The North Anatolian Fau...
Article
We re-evaluate the 72 year history of surface slip on the North Anatolian Fault at Ismetpasa since the Mw = 7.4 1944 Bolu/Gerede earthquake. A revised analysis of published observations suggests that days after the earthquake the fault had been offset by 3.7 m, and 6 years later by an additional 0.74 m. Creep was first recognized on the fault in 19...
Poster
Full-text available
Surface creep on the North Anatolian fault was first recognized in 1969 in the form of an offset wall that had been constructed across the fault 13 years after the 1944 Mw=7.4 Bolu/Gerede earthquake. Publications by Ambraseys (1970) and Aytun (1982), however, reported this offset as 24 cm and 18 cm respectively resulting in an apparently unresolvab...
Conference Paper
Full-text available
GNSS observations on the western part of the North Anatolian Fault Zone (NAFZ) have been carrying out since the beginning of 1990s. August 17, 1999, Izmit earthquake (Mw= 7.4) excited more scientific attention on this area. Bogazici University Kandilli Observatory and Earthquake Research Institute (KOERI), Geodesy Department has been continually co...
Article
Full-text available
The submarine Istanbul-Silivri fault segment, within 15km of Istanbul, is the only portion of the North Anatolian Fault that has not ruptured in the last 250years. We report first results of a seafloor acoustic ranging experiment to quantify current horizontal deformation along this segment and assess whether the segment is creeping aseismically or...