scholarly journals Crustal anisotropy of Taihang Mountain Range using azimuthal variation of receiver functions

2008 ◽  
Vol 21 (4) ◽  
pp. 358-369 ◽  
Author(s):  
Bao-feng Tian ◽  
Juan Li ◽  
Zhen-xing Yao
Keyword(s):  
Receiver Functions ◽  
Mountain Range ◽  
Crustal Anisotropy ◽  
Azimuthal Variation ◽  
Taihang Mountain

The Expansion of the Taihang Mountain Range

2013 ◽  
Vol 2013 (33) ◽  
pp. 107-134
Author(s):  
Jingfei Niu
Keyword(s):  
Mountain Range ◽  
Taihang Mountain

Crustal Anisotropy beneath Northern Iran calculated by harmonic decomposition of Receiver Functions.

2020 ◽  
Author(s):  
Mohsen Azqandi ◽  
Mohammad Reza Abbassi ◽  
Meysam Mahmoodabadi ◽  
Ahmad Sadidkhouy
Keyword(s):  
Receiver Function ◽  
Receiver Functions ◽  
Upper Crust ◽  
Northern Iran ◽  
Crustal Anisotropy ◽  
Principal Stress Direction ◽  
South Central ◽  
Stress Direction ◽  
Harmonic Decomposition ◽  
Time Variations

<p>This study concerns crustal anisotropy at 16 permanent seismic stations to investigate preferentially aligned cracks or structures and their relation to the stress-state in the South Central Alborz (northern Iran). We consider plunging anisotropy and dipping interfaces of multiple layers using harmonic functions to correct the arrival time variations of <em>Ps</em> phases from different back-azimuths.</p><p>The dominant fast orientation of integrated crustal anisotropy strikes NE, almost parallel to the stress direction in the upper crust. The magnitude of crustal anisotropy is found to be in range of 0.1 s to 0.5 s. In some stations, intracrustal interface is observed, for which we analyzed harmonic decomposition of receiver functions to consider anisotropy in the upper crust. Upper crustal anisotropy strikes NE, close to the principal stress direction, indicating that stress in the upper crust plays a major role in producing anisotropy and deformation. In a few stations, crustal anisotropy display different directions rather than NE, which maybe controlled by cracks and fractures of dominant faults.</p><p>Keywords: Anisotropy, Receiver function, harmonic decomposition, Northern Iran.</p>

A Study on Crustal Anisotropy Using P to S Converted Phases of Receiver Functions: Application to Ailaoshan-Red River Fault Zone

2006 ◽  
Vol 49 (2) ◽  
pp. 383-393 ◽  
Author(s):  
Zhen XU ◽  
Ming-Jie XU ◽  
Liang-Shu WANG ◽  
Jian-Hua LIU ◽  
Kai ZHONG ◽  
...  
Keyword(s):  
Fault Zone ◽  
Receiver Functions ◽  
Red River ◽  
Crustal Anisotropy ◽  
Converted Phases ◽  
Red River Fault

scholarly journals Mantle upwelling beneath the Apennines identified by receiver function imaging

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Claudio Chiarabba ◽  
Irene Bianchi ◽  
Pasquale De Gori ◽  
Nicola Piana Agostinetti
Keyword(s):  
Receiver Function ◽  
Receiver Functions ◽  
Mountain Range ◽  
Mantle Upwelling ◽  
Uppermost Mantle ◽  
Mantle Dynamics ◽  
Wave Velocities ◽  
Shear Wave Velocities ◽  
Mountain Belt ◽  
Poor Understanding

AbstractMagmatism, uplift and extension diffusely take place along collisional belts. Even though links between mantle dynamics and shallow deformation are becoming more evident, there is still poor understanding of how deep and surface processes are connected. In this work, we present new observations on the structure of the uppermost mantle beneath the Apennines belt. Receiver functions and seismic tomography consistently define a broad zone in the shallow mantle beneath the mountain belt where the shear wave velocities are lower than about 5% and the Vp/Vs ratio is higher than 3% than the reference values for these depths. We interpret these anomalies as a pronounced mantle upwelling with accumulation of melts at the crust-mantle interface, on top of which extensional seismicity responds to the crustal bending. The melted region extends from the Tyrrhenian side to the central part of the belt, with upraise of fluids within the crust favored by the current extension concentrated in the Apennines mountain range. More in general, mantle upwelling, following detachment of continental lithosphere, is a likely cause for elevated topography, magmatism and extension in post-collisional belts.

Opening of the north-eastern Atlantic and onshore mountain rise controlled by Fennoscandian deep structure

2021 ◽  
Author(s):  
Anna Makushkina ◽  
Benoit Tauzin ◽  
Meghan Miller ◽  
Hrvoje Tkalcic ◽  
Hans Thybo
Keyword(s):  
Continental Margin ◽  
Large Scale ◽  
Deep Structure ◽  
Tectonic Setting ◽  
Structural Heterogeneity ◽  
Receiver Functions ◽  
Mountain Range ◽  
North East ◽  
The North ◽  
Active Tectonic

<p>Large-scale topography is thought to be mainly controlled by active tectonic processes. Fennoscandia is located far from any active tectonic setting and yet includes a mountain range along its passive North Atlantic margin. Models proposed to explain the origin of these enigmatic mountains are based on glacial isostatic adjustments, delamination, long-term isostatic equilibration, and dynamic support from the mantle, yet no consensus has been reached. We show that topography along the continental margin of Fennoscandia may be influenced by its deep structure. Fennoscandia formed by amalgamation of Proterozoic and Archean continental blocks; using both S- and P-receiver functions, we discovered that the Fennoscandian lithosphere still retains the original structural heterogeneity and its western margin is composed of three distinct blocks. The southern and northern blocks have relatively thin crust (~40-45 km), while the central block has thick crust (~60 km) that most likely was formed by crustal stacking during the Proterozoic amalgamation. The boundaries of the blocks continue into the oceanic crust as two major structural zones of the North-East Atlantic, suggesting that the Fennoscandian amalgamation structures determined the geometry of the ocean opening.  We found no evidence for mountain root support or delamination in the areas of high topography that could be related with mountain formation. Instead, our results suggest that both crustal and lithospheric heterogeneity of Fennoscandia along the continental margin might have a control on geodynamic forces that support the rise of Scandinavian mountains. </p>

ScanArray - Seismological study of the connection between topographic change and deep structure in Fennoscandia

2021 ◽  
Author(s):  
Hans Thybo ◽  
Nevra Bulut ◽  
Michael Grund ◽  
Alexandra Mauerberger ◽  
Anna Makushkina ◽  
...  
Keyword(s):  
Baltic Shield ◽  
Upper Mantle ◽  
Deep Structure ◽  
Broad Band ◽  
Receiver Functions ◽  
High Mountain ◽  
Mountain Range ◽  
S Wave ◽  
Crust And Upper Mantle ◽  
The Baltic

<p>The Baltic Shield is located in northern Europe. It was formed by amalgamation of a series of terranes and microcontinents during the Archean to the Paleoproterozoic, followed by significant modification in Neoproterozoic to Paleozoic time. The Baltic Shield includes a high mountain range, the Scandes, along its western North Atlantic coast, despite being a stable craton located far from any active plate boundary.</p> <p>The ScanArray international collaborative program has acquired broad band seismological data at 192 locations in the Baltic Shield during the period between 2012 and 2017. The main objective of the program is to provide seismological constraints on the structure of the lithospheric crust and mantle as well as the sublithospheric upper mantle. The new information will be applied to studies of how the lithospheric and deep structure affects observed fast topographic change and geological-tectonic evolution of the region. The recordings are of very high quality and are used for analysis by suite of methods, including P- and S-wave receiver functions for the crust and upper mantle, surface wave and ambient noise inversion for seismic velocity, body wave P- and S- wave tomography for upper mantle velocity structure, and shear-wave splitting measurements for obtaining bulk anisotropy of the upper and lower mantle. Here we provide a short overview of the data acquisition and initial analysis of the new data with focus on parameters that constrain the fast topographic change in the Scandes.</p> <p> </p>

scholarly journals Crustal anisotropy across northern Japan from receiver functions

2015 ◽  
Vol 120 (7) ◽  
pp. 4998-5012 ◽  
Author(s):  
I. Bianchi ◽  
G. Bokelmann ◽  
K. Shiomi
Keyword(s):  
Receiver Functions ◽  
Crustal Anisotropy ◽  
Northern Japan
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