Crustal velocity structure of central Gansu Province from regional seismic waveform inversion using firework algorithm

2017 ◽  
Vol 30 (2) ◽  
pp. 81-89 ◽  
Author(s):  
Yanyang Chen ◽  
Yanbin Wang ◽  
Yuansheng Zhang
Keyword(s):  
Velocity Structure ◽  
Waveform Inversion ◽  
Gansu Province ◽  
Seismic Waveform ◽  
Crustal Velocity ◽  
Crustal Velocity Structure

Regional full seismic waveform inversion of crustal velocity structure in Qaidam Basin

2021 ◽  
Author(s):  
Biao Yang ◽  
Zhoupeng Wang ◽  
Yanbin Wang
Keyword(s):  
Lower Crust ◽  
Velocity Structure ◽  
Qaidam Basin ◽  
Northwestern Part ◽  
The Tibetan Plateau ◽  
Crust And Upper Mantle ◽  
Lower Velocity ◽  
Seismic Waveform ◽  
Crustal Velocity ◽  
Crustal Velocity Structure

<p>       Under the northward push of the Tibetan Plateau, Qaidam basin is the intersection of Traim block, Bayan Har block and Qilian orogen. Inversion and interpretation of the crustal structure under Qaidam basin are helpful to understand the evolution of the plateau. On November 10, 2008, an Mw6.3 earthquake occurred in the northern margin of Qaidam basin and was recorded by 17 broadband temporary stations installed by the INDEPTH IV Project. We performed inversion of the recorded regional seismic waveforms combining niche genetic algorithm and reflectivity method and obtained the crustal velocity structure of the eastern, western and northwestern part of Qaidam basin.The inversion results show that the structures of the eastern and western basin are similar, where both exist a very thin low velocity layer at about 26km in the middle crust. The thicker lower crust of the west basin results in thicker crust than that of the east basin, which reveals decoupling of the upper and lower crust of the basin. The structure of the northwestern basin is quite different from other regions with much thicker crust, lower velocity of the lower crust and upper mantle, indicating strong deformation and partial melting.</p>

Crustal velocity structure and earthquake processes of Garhwal-Kumaun Himalaya: Constraints from regional waveform inversion and array beam modeling

2017 ◽  
Vol 712-713 ◽  
pp. 45-63 ◽  
Author(s):  
Sanjay S. Negi ◽  
Ajay Paul ◽  
Simone Cesca ◽  
Kamal ◽  
Marius Kriegerowski ◽  
...  
Keyword(s):  
Velocity Structure ◽  
Waveform Inversion ◽  
Kumaun Himalaya ◽  
Crustal Velocity ◽  
Crustal Velocity Structure ◽  
Beam Modeling

Crustal velocity structure across the Tornquist and Iapetus Suture Zones — a comparison based on MONA LISA and VARNET data

1999 ◽  
Vol 314 (1-3) ◽  
pp. 69-82 ◽  
Author(s):  
Tanni Abramovitz ◽  
Michael Landes ◽  
Hans Thybo ◽  
A.W.Brian Jacob ◽  
Claus Prodehl
Keyword(s):  
Velocity Structure ◽  
Crustal Velocity ◽  
Crustal Velocity Structure ◽  
Mona Lisa

2-D Crustal Velocity Structure Along Hirapur-Mandla Profile in Central India: An Update

2004 ◽  
Vol 161 (1) ◽  
pp. 165-184 ◽  
Author(s):  
A. S. N. Murty ◽  
H. C. Tewari ◽  
P. R. Reddy
Keyword(s):  
Velocity Structure ◽  
Central India ◽  
Crustal Velocity ◽  
Crustal Velocity Structure

Crustal velocity structure from SAREX, the Southern Alberta Refraction Experiment

2002 ◽  
Vol 39 (3) ◽  
pp. 351-373 ◽  
Author(s):  
Ron M Clowes ◽  
Michael JA Burianyk ◽  
Andrew R Gorman ◽  
Ernest R Kanasewich
Keyword(s):  
Velocity Structure ◽  
Data Interpretation ◽  
Crustal Thickening ◽  
Tectonic Zone ◽  
Crustal Layer ◽  
Crustal Velocity ◽  
Crustal Velocity Structure ◽  
Southern Alberta ◽  
Magmatic Underplating ◽  
Lower Crustal

Lithoprobe's Southern Alberta Refraction Experiment, SAREX, extends 800 km from east-central Alberta to central Montana. It was designed to investigate crustal velocity structure of the Archean domains underlying the Western Canada Sedimentary Basin. From north to south, SAREX crosses the Loverna domain of the Hearne Province, the Vulcan structure, the Medicine Hat block (previously considered part of the Hearne Province), the Great Falls tectonic zone, and the northern Wyoming Province. Ten shot points along the profile in Canada were recorded on 521 seismographs deployed at 1 km intervals. To extend the line, an additional 140 seismographs were deployed at intervals of 1.25–2.50 km in Montana. Data interpretation used an iterative application of damped least-squares inversion of traveltime picks and forward modeling. Results show different velocity structures for the major blocks (Loverna, Medicine Hat, and Wyoming), indicating that each is distinct. Wavy undulations in the velocity structure of the Loverna block may be associated with internal crustal deformation. The most prominent feature of the model is a thick (10–25 km) lower crustal layer with high velocities (7.5–7.9 km/s) underlying the Medicine Hat and Wyoming blocks. Based on data from lower crustal xenoliths in the region, this layer is interpreted to be the result of Paleoproterozoic magmatic underplating. Crustal thickness varies from 40 km in the north to almost 60 km in the south, where the high-velocity layer is thickest. Uppermost mantle velocities range from 8.05 to 8.2 km/s, with the higher values below the thicker crust. Results from SAREX and other recent studies are synthesized to develop a schematic representation of Archean to Paleoproterozoic tectonic development for the region encompassing the profile. Tectonic processes associated with this development include collisions of continental blocks, subduction, crustal thickening, and magmatic underplating.

scholarly journals Crustal velocity structure of the Lucky Strike segment of the Mid-Atlantic Ridge at 37°N from seismic refraction measurements

2010 ◽  
Vol 115 (B3) ◽  
Author(s):  
Tim Seher ◽  
Wayne C. Crawford ◽  
Satish C. Singh ◽  
Mathilde Cannat ◽  
Violaine Combier ◽  
...  
Keyword(s):  
Velocity Structure ◽  
Seismic Refraction ◽  
Lucky Strike ◽  
Crustal Velocity ◽  
Crustal Velocity Structure ◽  
Mid Atlantic Ridge
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