High-resolution seismic-reflection profiles collected by the R/V Columbus Iselin, cruise CI 7807-1, in the Baltimore Canyon outer continental shelf area, offshore New Jersey

1980 ◽  
Author(s):  
James M. Robb
Keyword(s):  
New Jersey ◽  
High Resolution ◽  
Continental Shelf ◽  
Seismic Reflection ◽  
Shelf Area ◽  
Outer Continental Shelf ◽  
Continental Shelf Area ◽  
Seismic Reflection Profiles

Xác định cấu trúc hình thái của châu thổ cửu long trên thềm lục địa ven bờ Cà Mau trên cơ sở tài liệu địa chấn nông phân giải cao

2008 ◽  
Vol 30 (4) ◽  
pp. 356-362
Author(s):  
Nguyễn Tiến Hải ◽  
Phùng Văn Phách ◽  
K. Stattegger
Keyword(s):  
High Resolution ◽  
Continental Shelf ◽  
Seismic Profile ◽  
Shelf Area ◽  
Profile Data ◽  
Shallow Seismic ◽  
Continental Shelf Area

Determination of Cuu Long delta's morphology in the Ca Mau continental shelf area by applying high resolution shallow seismic profile data

Seismic reflection constraints on imbrication and underplating of the northern Cascadia convergent margin

1996 ◽  
Vol 33 (9) ◽  
pp. 1294-1307 ◽  
Author(s):  
A. J. Calvert
Keyword(s):  
Continental Shelf ◽  
Seismic Reflection ◽  
Deep Structure ◽  
Vancouver Island ◽  
Cascadia Subduction Zone ◽  
Accretionary Wedge ◽  
Seismic Profiles ◽  
Outer Continental Shelf ◽  
E Region ◽  
Seismic Reflection Profiles

An interpretation of the deep structure of the continental shelf offshore southern Vancouver Island, subject to constraints from other geophysical data, is derived by combining seismic reflection profiles shot in 1989 with those from an earlier 1985 survey. Accretionary wedge sediments, which extend landward beneath the volcanic Crescent terrane, comprise two primary units, both of which have shortened through duplex formation. The maximum thickness of the Crescent terrane, 6–8 km, occurs just seaward of its contact with the inboard, largely metasedimentary Pacific Rim terrane. The E region of reflectivity, first detected dipping landward beneath Vancouver Island, is regionally extensive, being observed on all the seismic profiles. The E reflectivity thins seaward and splits into two or more strands that probably link into major faults within the accreted sedimentary wedge. Reflections from the interplate décollement beneath the outer continental shelf separate from the downgoing plate, continue into the deepest level of the E reflectivity, and are interpreted to represent a single décollement surface above which imbrication of accreted units occurred. It is proposed that at the southern end of Vancouver Island the E reflections represent mainly underthrust sediments above a former subduction décollement, both of which were incorporated into the overlying continent when the subduction thrust stepped down into the descending oceanic plate. This change in depth of the subduction thrust underplated one or more mafic units to the continent. The reflection from the top of the subducting Juan de Fuca plate appears to be around 5 km shallower farther north along the margin, indicating that the underplated region could be confined to the embayment in the Cascadia subduction zone.

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