Osman Oktar

Dr. Osman Oktar

orcid

Research Focus & Metrics

Academic Career Length

6Years (2021-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

View All Publications
23 November 2021 in Arabian Journal of Geosciences
Verified
Journal Article
Closed access
PDF file
OOOsman Oktar
Osman Oktar
HEHediye Erdoğan
Hediye Erdoğan
FPFatih Poyraz
Fatih Poyraz
İTİbrahim Tiryakioğlu
İbrahim Tiryakioğlu

15 June 2021 in Turkish Journal of Geosciences
Verified
Journal Article
Closed access
PDF file
BGBekir Gündoğdu
Bekir Gündoğdu
HEHediye Erdoğan
Hediye Erdoğan
OOOsman Oktar
Osman Oktar
Disasters can cause many loss of life and property every year. Although sudden disasters such as earthquakes and tsunamis cannot be detected in advance, knowing where and when disasters may occur or quickly determining the impact area of a disaster is the main factor in preventing these losses. For this reason, many different measurement methods have been developed by various professional disciplines in order to examine disasters. One of these methods is the Interferometric Synthetic Aperture Radar (InSAR) method, which is a remote sensing method. In this study, the 2015 Chile Illapel earthquake with the Differential SAR Interferometry (DInSAR) method based on the InSAR method, the vertical deformations and change analysis in the Konya Karapınar district, and the California Carr fire with the Permanent Scatterer SAR Interferometry (PS-InSAR) method were investigated. As a result of the investigations, the deformation in the LOS direction in the 2015 Chile Illapel earthquake region was found to be ∼151 cm and the vertical deformations in the Konya Karapınar district were found in the range of 6.4 to -63.7 cm. Additionally, the initial and full spread area of the California Carr fire were determined.

15 December 2021 in Turkish Journal of Geosciences
Verified
Journal Article
Closed access
ARAbdulmalek Redhwan
Abdulmalek Redhwan
HEHediye Erdoğan
Hediye Erdoğan
OOOsman Oktar
Osman Oktar
CGCemil Gezgin
Cemil Gezgin
In this study, the linear behaviors in the North, East and Up directions of 30 CORS-TR stations in the Central Anatolian Region were obtained by the trend component analysis which is the time series component. The time series of the stations between 2017-2020 years were calculated in the Eurasia-fixed frame with the GAMIT/GLOBK software. As a result of the analysis, the average horizontal velocity of the stations in the east of the Central Anatolian Region is 17.59 mm/year in the northwest direction, and the average horizontal velocity of the stations in the west is 18.66 mm/year in the southwest direction. This movement shows the movement of the Anatolian plate in the southwest direction in terms of direction and velocity and is in agreement with other research results. In the linear changes in the up coordinates of the stations, the greatest linear change was detected at the KNY1 (-48.22 mm/year) station. It is thought that this change at station KNY1 is due to the decrease in groundwater level in this region (Konya Closed Basin). In addition, in the standard deviation (m0) values of the time series that obtained as a result of the analysis, linear changes were approximately the same for the north and east directions, and about 2-3 times larger for the up values compared to the north or east directions.

1 April 2024 in Geofísica Internacional
Verified
Journal Article
Open access
PDF file
RDRamazan Demircioğlu
Ramazan Demircioğlu
OOOsman Oktar
Osman Oktar
In this study, the section of the Salanda fault zone between Yesiloz village and Gumuskent (Nevsehir, Turkey) was investigated by geodetic methods, and the amount of movement in this area was determined. We used a Persistent Scatterer Interferometric Synthetic Aperture Radar (PSInSAR) to determine the line of sight (LOS) movement. Previous studies using geological and geomorphological indices have shown that the Salanda fault zone is active. For the first time in this study, 36 synthetic aperture radar (SAR) images acquired between January 8, 2020, and November 29, 2022, were used in PSInSAR analysis. When the annual velocity values of the stud area in the LOS direction were analysed, annual subsidence values of up to 7.6 mm and annual uplift values of up to 7.2 mm were revealed. These movements indicate that the Salanda fault is active and normal fault characteristics. However, it also has a dextral strike-slip component.

20 December 2021 in Arabian Journal of Geosciences
Verified
Journal Article
Closed access
PDF file
OOOsman Oktar
Osman Oktar
HEHediye Erdoğan
Hediye Erdoğan
FPFatih Poyraz
Fatih Poyraz
İTİbrahim Tiryakioğlu
İbrahim Tiryakioğlu

1 January 2023 in Afyon Kocatepe University Journal of Sciences and Engineering
Verified
Journal Article
Open access
PDF file
OOOsman Oktar
Osman Oktar
Bu çalışmada, Derinkuyu Yeraltı Şehrinin bulunduğu bölgede uydu bakış doğrultusundaki (LOS) hareketlerin belirlenmesi amacıyla Derinkuyu merkezini kapsayacak şekilde PSInSAR analizi gerçekleştirilmiştir. PSInSAR analizinde 11.10.2014 İle 09.12.2022 tarihleri arasında algılanmış 37 adet SAR görüntüsü kullanılmıştır. PSInSAR analizi StaMPS programı kullanılarak gerçekleştirilmiştir. Çalışma alanında 2014-2021 (8 yıl), 2018-2021 (4 yıl) ve 2020-2021 (2 yıl) yıllarını kapsayan SAR görüntüleri analiz edilmiştir. Çalışma bölgesi için elde edilen uydu bakış doğrultusundaki (LOS) hızlar incelendiğinde; bölgede yıllık 6.11 mm’ye kadar alçalma değerleri ve -6.25 mm’ye kadar yükselme değerleri elde edilmiştir. LOS yönünde elde edilen hızlar ve standart sapmaları incelendiğinde; Derinkuyu Yeraltı Şehri’nin bulunduğu bölgede anlamlı bir alçalma ve yükselme değerinin bulunmadığı belirlenmiştir.