Show/Hide Menu
Hide/Show Apps
Logout
Türkçe
Türkçe
Search
Search
Login
Login
OpenMETU
OpenMETU
About
About
Open Science Policy
Open Science Policy
Open Access Guideline
Open Access Guideline
Postgraduate Thesis Guideline
Postgraduate Thesis Guideline
Communities & Collections
Communities & Collections
Help
Help
Frequently Asked Questions
Frequently Asked Questions
Guides
Guides
Thesis submission
Thesis submission
MS without thesis term project submission
MS without thesis term project submission
Publication submission with DOI
Publication submission with DOI
Publication submission
Publication submission
Supporting Information
Supporting Information
General Information
General Information
Copyright, Embargo and License
Copyright, Embargo and License
Contact us
Contact us
Crustal deformation and crust mantle interaction in active collision zones Cental Tibet and East Anatolia
Date
2004-12-13
Author
Zandt, George
Özacar, Atilla Arda
Beck, Susan L.
Metadata
Show full item record
This work is licensed under a
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
.
Item Usage Stats
130
views
0
downloads
Cite This
A major question in the tectonics of collisional mountain belts concerns the relative coupling or decoupling of the crust and mantle. In this respect, recent IRIS PASSCAL seismic experiments in the Tibetan and East Anatolian plateaus provide an important opportunity to study crustal deformation and crust-mantle interactions in continental collisions. Receiver functions (RF) from the dense INDEPTH III seismic array that was deployed across central Tibet, show a crustal thickness of $\sim65$ km and a very weak Moho beneath the Bangong-Nujiang suture (BNS) that could be due either to a gradational velocity contrast or scattering by topography on the Moho. By using a global minimization technique, we modeled the azimuth dependant variations on RFs recorded at a representative station within the suture and found strong anisotropy near the surface and in the middle crust separated by south dipping ($\sim25\deg$) layer. Mid-crustal anisotropy occurs in a low velocity zone (LVZ) and has a fabric dipping gently ($\sim18\deg$) northward that might be related to a well-developed near-horizontal rock fabric induced by crustal flow. On the other hand, a preliminary analysis of data recorded by the Eastern Turkey Seismic Experiment (ETSE) show a drastic change in crustal structure between the Arabian plate and East Anatolian plateau across the Bitlis suture. RFs show a strong Moho ($\sim40$ km) and a mid-crustal discontinuity ($\sim25$ km) beneath the Arabian plate and a slightly weaker Moho ($\sim45$ km), a mid-crustal LVZ ($\sim25$ km) and a mantle discontinuity ($\sim85$ km) beneath the East Anatolian plateau. Arrival times of multiples also indicate low Vp/Vs ($\sim1.70$) for the Arabian plate and high Vp/Vs ($\sim1.80$) for the plateau. In the central region of the plateau, the fast directions of SKS splitting and Pn anisotropy are parallel to each other but at high angles to the GPS motions suggesting crustal flow within the LVZ that decouples surface deformation from the upper mantle. In contrast, for the Arabian plate, the GPS motions are parallel to the Pn but different from the SKS fast directions and may reflect a coupled crust and upper mantle. In order to test this idea, we will model crustal anisotropy that is characterized by systematic tangential energy and polarity reversals in the existing data and interpret its tectonic significance.
URI
http://abstractsearch.agu.org/meetings/2004/FM/sections/T/sessions/T51C/abstracts/T51C-0463.html
https://hdl.handle.net/11511/94876
Conference Name
American Geophysical Union (AGU) 2004 Fall Meeting
Collections
Department of Geological Engineering, Conference / Seminar
Suggestions
OpenMETU
Core
Subduction dynamics beneath Anatolia: tectonic, metamorphic and thermal consequences on the Aegean/Anatolian transition zone
Bozkurt, Erdin (null; 2018-04-08)
Slab rollback and tearing are common features in subduction zones and have a strong impact on the tectonic and metamorphic evolution of the overriding plate. Slab tearing below the Aegean Sea for instance had first order tectonic and magmatic consequences because it induced toroidal asthenospheric mantle flow that controls the typology and distribution of melts at the surface but also lateral gradients of extension in the upper plate. However, coupling mechanisms between the complex 3D mantle flow at depth ...
Tectonic history of basins sited along the western section of the North Anatolian Fault System, Turkey
SARP, Gülcan; Gurboga, Sule; Toprak, Vedat; Duzgun, Sebnem (2014-01-01)
Geological and geomorphological features of basins along the western half of the North Anatolian Fault System (NAFS) are used to constrain the formation of these basins by localization of deformation and the total displacement, and to determine the timing of basin development. In this study, tectonic influence direction of the NAFS on tectonic and hydrologic basins Bolu, Yenicaga, Dortdivan, Cerkes, Ilgaz and Tosya has been investigated to deduce information about the formation stages and interaction betwee...
TSUNAMI MAXIMUM RUNUP AND FOCUSING THROUGH EARTHQUAKE SOURCE PARAMETERS
Sharghivand, Naeimeh; Aşık, Mehmet Zülfü; Department of Engineering Sciences (2022-8-11)
In this study, the N-wave profile is fitted to the seafloor deformation for a large set of earthquake scenarios, i.e., assuming that the seafloor deformation resulting from an earthquake instantaneously transfers to the sea surface. Hence, the N-wave parameters are identified with respect to the earthquake source parameters allowing to express the initial tsunami profile in terms of the earthquake source parameters. Then, the maximum tsunami runup is presented through the earthquake fault plane parameters u...
Seismic intensity maps for the eastern part of the North Anatolian Fault Zone (Turkey) based on recorded and simulated ground-motion data
Karim Zadeh Naghshineh, Shaghayegh; Askan Gündoğan, Ayşegül (John Wiley & Sons, 2017-01-01)
"Neotectonics involves the study of the motions and deformations of the Earth's crust that are current or recent in geologic time. The Mediterranean region is one of the most important regions for neotectonics and related natural hazards. This volume focuses on the neotectonics of the Eastern Mediterranean region, which has experienced many major extensive earthquakes, including the devastating Izmit, Turkey earthquake on August 17, 1999. The event lasted for 37 seconds, killing around 17,000 people, injuri...
Stochastic geometry model of rock mass fracture network in tunnels
Azarafza, Mohammad; Akgün, Haluk; Asghari-Kaljahi, Ebrahim (Geological Society of London, 2018-08-01)
Geometric distributions of fractures or discontinuities control the behaviour, and limit the strength and the stability of rock masses where the best stabilization and improvement method for that rock mass could be achieved based on favourable discontinuity geometry. This study introduces an algorithm named 'Stochastic Geometry Model of Fractures Network in Tunnels (SGMFNT)', which was developed with the MA THEMATICA software. The SGMFNT method provides a fractures geometric distribution database to aid dis...
Citation Formats
IEEE
ACM
APA
CHICAGO
MLA
BibTeX
G. Zandt, A. A. Özacar, and S. L. Beck, “Crustal deformation and crust mantle interaction in active collision zones Cental Tibet and East Anatolia,” San-Francisco, Kostarika, 2004, vol. 85, Accessed: 00, 2021. [Online]. Available: http://abstractsearch.agu.org/meetings/2004/FM/sections/T/sessions/T51C/abstracts/T51C-0463.html.