scholarly journals Institute of Marine Geology and Geophysics - 30 years for studying geology and geophysics in the marine zones of Vietnam and Eastern Sea

2019 ◽  
Vol 19 (3B) ◽  
pp. 1-15
Author(s):  
Bui Cong Que
Keyword(s):  
Crustal Structure ◽  
Mineral Exploration ◽  
Marine Geology ◽  
Geophysical Investigation ◽  
Geophysical Research ◽  
Marine Research ◽  
Seabed Sediment ◽  
Geophysical Fields ◽  
Marine Geology And Geophysics ◽  
Deep Crustal Structure

Geological and geophysical investigation and study in the marine zones of Vietnam and Eastern Sea, its application in the mineral exploration, for natural disaster and hazard prevention, environment and resource protection, for sea and island management, marine economic development, sea defence and security is the important, main and long-term tasks of the Institute of Marine Geology and Geophysics. For last 30 years, the institute has a leading role for conducting a numerous projects of national and international programs of marine research and investigation in the marine zones of Vietnam and Eastern Sea. The obtained results and achievements include  big, abundant, up to date databases, newest and detailed schemes and maps, valuable published papers, books, and contributions on characteristics of geophysical fields, deep crustal structure, seabed sediment and environment, geological structure and tectonic evolution, seismotectonics and earthquake, tsunami hazard assessment, mineral potential and perspective evaluation. Results of study on geophysical fields, deep crustal structure, seabed topography and geomorphology have been used for determination of outer limits of continental shelf of Vietnam in the Eastern Sea. Big part of the results was gained from research and investigation projects conducted in the Truong Sa and Hoang Sa areas. On the basis of the obtained achievements, some special tasks are proposed to continue conducting the geological and geophysical research and investigation in the sea of Vietnam and adjacent areas.

scholarly journals Deep Crustal Structure of the Capricorn Orogen from Gravity and Seismic Data

2015 ◽  
Vol 2015 (1) ◽  
pp. 1-3
Author(s):  
Abdulrhman H. Alghamdi ◽  
Alan R.A. Aitken ◽  
Michael C. Dentith
Keyword(s):  
Crustal Structure ◽  
Seismic Data ◽  
Deep Crustal Structure

Deep crustal structure and seismic expression of the central Appalachian orogenic belt

Geology ◽  
1992 ◽  
Vol 20 (3) ◽  
pp. 275 ◽  
Author(s):  
Gregory C. Herman
Keyword(s):  
Crustal Structure ◽  
Orogenic Belt ◽  
Deep Crustal Structure

Asymmetric deep crustal structure across the Juan de Fuca Ridge

Geology ◽  
1988 ◽  
Vol 16 (6) ◽  
pp. 533 ◽  
Author(s):  
K.M.M. Rohr ◽  
B. Milkereit ◽  
C. J. Yorath
Keyword(s):  
Crustal Structure ◽  
Juan De Fuca Ridge ◽  
Fuca Ridge ◽  
Juan De Fuca ◽  
Deep Crustal Structure

Deep crustal structure across a young passive margin from wide-angle and reflection seismic data (The SARDINIA Experiment) – II. Sardinia’s margin

2015 ◽  
Vol 186 (4-5) ◽  
pp. 331-351 ◽  
Author(s):  
Alexandra Afilhado ◽  
Maryline Moulin ◽  
Daniel Aslanian ◽  
Philippe Schnürle ◽  
Frauke Klingelhoefer ◽  
...  
Keyword(s):  
Crustal Structure ◽  
Passive Margin ◽  
Data Sets ◽  
Wide Angle ◽  
Seismic Velocities ◽  
The West ◽  
Reflection Seismic ◽  
Gulf Of Lion ◽  
Deep Crustal Structure ◽  
Domain Iii

Abstract Geophysical data acquired on the conjugate margins system of the Gulf of Lion and West Sardinia (GLWS) is unique in its ability to address fundamental questions about rifting (i.e. crustal thinning, the nature of the continent-ocean transition zone, the style of rifting and subsequent evolution, and the connection between deep and surface processes). While the Gulf of Lion (GoL) was the site of several deep seismic experiments, which occurred before the SARDINIA Experiment (ESP and ECORS Experiments in 1981 and 1988 respectively), the crustal structure of the West Sardinia margin remains unknown. This paper describes the first modeling of wide-angle and near-vertical reflection multi-channel seismic (MCS) profiles crossing the West Sardinia margin, in the Mediterranean Sea. The profiles were acquired, together with the exact conjugate of the profiles crossing the GoL, during the SARDINIA experiment in December 2006 with the French R/V L’Atalante. Forward wide-angle modeling of both data sets (wide-angle and multi-channel seismic) confirms that the margin is characterized by three distinct domains following the onshore unthinned, 26 km-thick continental crust : Domain V, where the crust thins from ~26 to 6 km in a width of about 75 km; Domain IV where the basement is characterized by high velocity gradients and lower crustal seismic velocities from 6.8 to 7.25 km/s, which are atypical for either crustal or upper mantle material, and Domain III composed of “atypical” oceanic crust. The structure observed on the West Sardinian margin presents a distribution of seismic velocities that is symmetrical with those observed on the Gulf of Lion’s side, except for the dimension of each domain and with respect to the initiation of seafloor spreading. This result does not support the hypothesis of simple shear mechanism operating along a lithospheric detachment during the formation of the Liguro-Provencal basin.

Formation, segmentation and deep crustal structure variations along the Algerian margin from the SPIRAL seismic experiment

2021 ◽  
pp. 104433
Author(s):  
Frauke Klingelhoefer ◽  
Jacques Déverchère ◽  
David Graindorge ◽  
Chafik Aïdi ◽  
Rabie Badji ◽  
...  
Keyword(s):  
Crustal Structure ◽  
Seismic Experiment ◽  
Deep Crustal Structure

Deep Crustal Structure in the Vicinity of the Siljan Ring

1988 ◽  
pp. 355-364
Author(s):  
C. E. Lund ◽  
R. G. Roberts ◽  
T. Dahl-Jensen ◽  
J. Lindgren
Keyword(s):  
Crustal Structure ◽  
Deep Crustal Structure
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