Seismic images of crustal variations beneath the East Anatolian Plateau (Turkey) from teleseismic receiver functions

Özacar, Atilla Arda
Gilbert, Hersh
Beck, Susan L.
We used teleseismic P-wave receiver functions recorded by the Eastern Turkey Seismic Experiment to determine the crustal structure across an active continent-continent collision zone. Moho depth and V-p/V-s variations in the region are mapped by incorporating crustal multiples and later two-dimsional (2-D) seismic profiles are produced using a common conversion point technique with our crustal V-p/V-s estimates. Moho depths do not correlate with surface topography and reveal a relatively thin crust consistent with the high plateau being supported by hot asthenosphere near the base of the crust. Under the Arabian plate, the crust is thinnest (c. 35 km) and exhibits high V-p/V-s (>= 1.8) associated with mafic compositions. In the east, the crust gradually becomes thicker towards the north and exceeds 45 km in the northeastern side whereas in the west, the crust thickens sharply near the Bitlis suture and displays pronounced Moho topography within the Anatolian plate that suggests the presence of multiple fragments. V-p/V-s variations show an anomalously high Vp/Vs corridor (>= 1.85) along the North Anatolian Fault and near the youngest volcanic units (c. 3 Ma) and support the presence of partial melt. This corridor is spatially limited from both north and south by low V-p/V-s regions implying a change in crustal composition. Near the Bitlis suture, a layered V-p/V-s model points to the source of low V-p/V-s in the lower crust that may be rich in quartz. Furthermore, the seismic profiles indicate a prominent low velocity zone in the lower crust across a large area beneath the plateau that may act as a decoupling zone between the crust and upper mantle.
Geological Society Special Publication


EDIGER, V; OKYAR, M; ERGIN, M (Elsevier BV, 1993-11-01)
High-resolution shallow seismic reflection (Uniboom) and echosounding profiles obtained on the shelf and upper slope areas of Anamur Bay (Turkey, northeastern Mediterranean) were studied together with previous data on the onshore geology of the area to investigate the origin and related seismic stratigraphy of the submarine Anamur Canyon. It was found that the main axial trend of the submarine Anamur Canyon is aligned with the offshore projection of the N-S orientated, onshore Anamur thrust fault of Late Cr...
Seismic response of base isolated liquid storage tanks to real and simulated near fault pulse type ground motions
Uçkan, Muhittin Eren; Umut, Onder; Sisman, Fatma Nurten; Karim Zadeh Naghshineh, Shaghayegh; Askan Gündoğan, Ayşegül (2018-09-01)
In this paper, the seismic response of base-isolated liquid storage tanks subjected to real and simulated near-fault ground motions is investigated. It is assumed that the tanks are seismically isolated by single surface Concave Sliding Bearings (CSB) with different isolation periods. For the input data, the recorded and simulated ground motions having pulse type characters and their dominant waveforms are considered.
Seismic assessment of a monolithic RCC gravity dam including three dimensional dam-foundation-reservoir interaction
Yilmazturk, Sema Melek; Arıcı, Yalın; Binici, Barış (2015-10-01)
In this study, the seismic response of a tall roller compacted concrete gravity dam located in a highly seismic zone is investigated. The response of this monolithic RCC gravity dam is examined by conducting analyses including three dimensional dam-reservoir-foundation interaction. The effect of the foundation/structure moduli ratio, material damping, and bottom absorption and reservoir compressibility on the performance of the dam were investigated. Selection of an optimal downstream slope was discussed ba...
Seismic hazard of Eastern Mediterranean region
Ertuğrul, Zehra (2010-12-01)
In the present study, probabilistic seismic hazard assessment was conducted for the Eastern Mediterranean region based on several new results: (1) a new comprehensive earthquake catalog, (2) seismic source models developed based on new geological, seismicity and geodetic data; and (3) new ground motion prediction equations (GMPEs). As the number of available regional ground motion records is not adequate to develop successful local GMPEs, the data in hand was employed for determining the most representative...
Performance Examination of Two Seismic Strengthening Procedures by Pseudodynamic Testing
Kurt, Efe Gokce; Kurç, Özgür; Binici, Barış; Canbay, Erdem; Ozcebe, Guney (American Society of Civil Engineers (ASCE), 2012-01-01)
Pseudodynamic testing was employed to observe the seismic performance of two retrofit methods on two-story, three-bay frame structures. The test frames had hollow clay tile (HCT) infill in the central bay and incorporated the seismic deficiencies of Turkish construction practice, such as use of plain reinforcing bars, low-strength concrete, and insufficient confining steel. Two noninvasive and occupant-friendly retrofit schemes suggested in the Turkish Earthquake Code, namely, use of fiber-reinforced polyme...
Citation Formats
A. A. Özacar, H. Gilbert, and S. L. Beck, “Seismic images of crustal variations beneath the East Anatolian Plateau (Turkey) from teleseismic receiver functions,” Geological Society Special Publication, pp. 485–496, 2010, Accessed: 00, 2020. [Online]. Available: