scholarly journals Preliminary Interpretation of Shallow Seismic Reflection Profiles From the West Side of Mackenzie Bay, Beaufort Sea

1971 ◽  
Author(s):  
J M Shearer
Keyword(s):  
Seismic Reflection ◽  
Beaufort Sea ◽  
The West ◽  
West Side ◽  
Shallow Seismic ◽  
Seismic Reflection Profiles

Problems interpreting deep crustal reflectors beneath the Moine thrust between Shetland and the Scottish Highlands

1995 ◽  
Vol 132 (5) ◽  
pp. 465-472
Author(s):  
J. H. McBride ◽  
R. W. England
Keyword(s):  
Crustal Structure ◽  
Seismic Reflection ◽  
Normal Fault ◽  
Moho Discontinuity ◽  
The West ◽  
Scottish Highlands ◽  
Thrust Zone ◽  
Compressional Deformation ◽  
Seismic Reflection Profiles ◽  
Eastern Edge

AbstractOffshore seismic reflection profiles crossing the Caledonian orogenic front (locally, ?Moine thrust) between Shetland and the Scottish Highlands show a singular coherent east-dipping reflection underlain by a highly reflective dipping zone in the middle crust extending down to the Moho discontinuity. This reflector pattern varies spatially with respect to the eastern edge of the Precambrian Lewisian foreland as well as to previously mapped locations of the Moine thrust. Southwest of Shetland, the reflector pattern coincides with the offshore projection of the Moine thrust, but further south, toward the Highlands, the reflector diverges to the west of the thrust and actually underlies autochthonous Lewisian foreland basement. Where this reflector pattern diverges from the Moine thrust, two interpretations are possible: the prominent reflector is part of a basement imbricate thrust duplex within the footwall (or ‘lower plate’) of the Moine thrust that merges with the thrust zone further north and/or it was originally a Proterozoic normal fault which, further north around Shetland, was reactivated or over-printed by the Moine thrust. The latter interpretation supports the importance of pre-existing crustal structure in controlling Caledonian compressional deformation.

scholarly journals Interpretation of shallow seismic profiles over the continental shelf in West Greenland between latitudes 64° and 69°30'N

1980 ◽  
Vol 100 ◽  
pp. 58-61
Author(s):  
E.F.K Zarudzki
Keyword(s):  
Continental Shelf ◽  
Seismic Reflection ◽  
Preliminary Report ◽  
Early Stage ◽  
Sidescan Sonar ◽  
Seismic Profiles ◽  
West Greenland ◽  
Shallow Seismic ◽  
Seismic Reflection Profiles

The work included the study of parts of the data obtained during the survey cruise WESTMAR 78, described in a preliminary report (Brett & Zarudzki, 1979). The data consist of 10 741 km seismic reflection profiles obtained with sparker, sub-bottom, airgun and boomer systems; 8474 km of bathymetric profiles, 3894 km of sidescan sonar profiles and 8545 km of magnetic profiles. The study objectives in the area and its subdivision were established at an early stage.

Seismic reflection, borehole and outcrop geometry of Late Wisconsin tills at a proposed landfill near Toronto, Ontario

1995 ◽  
Vol 32 (9) ◽  
pp. 1331-1349 ◽  
Author(s):  
Joseph I. Boyce ◽  
Nicholas Eyles ◽  
André Pugin
Keyword(s):  
Seismic Reflection ◽  
Seismic Reflection Data ◽  
Geophysical Logging ◽  
Greater Toronto Area ◽  
Reflection Data ◽  
Shallow Seismic ◽  
Surface Contaminants ◽  
Sand And Gravel ◽  
Seismic Reflection Profiles ◽  
High Degree

The search for new landfill sites in the Greater Toronto area of southern Ontario, Canada, is producing a wealth of data regarding the subsurface stratigraphy and geometry of Late Wisconsin (<25 ka) till deposits. Till strata are favoured as landfill substrates because of their wide surface extent, thickness (maximum ~60 m), high degree of overconsolidation, apparently massive character, and low permeability. However, problems are emerging where surface contaminants have migrated through till deposits into underlying aquifers along poorly understood transport paths. This paper reports the results of a detailed shallow seismic reflection investigation of a proposed 275 ha landfill site 40 km northeast of Toronto near Whitevale, where previous hydrochemical analysis and hydrogeological monitoring identified rapid vertical recharge of contaminated surface waters through Late Wisconsin tills up to 60 m thick. Seismic reflection data are ground truthed by drilling (36 holes; total drilled 3157 m), coring (1600 m), downhole geophysical logging, and outcrop data. The site stratigraphy at Whitevale consists of an uppermost Late Wisconsin till (Halton Till) separated from a lower till (informally named Northern till) by a silt, sand, and gravel complex. Seismic reflection profiles identify the presence of well-defined reflectors within the Northern till, which are correlated in outcrop with laterally extensive erosion surfaces overlain by sheet-like sands and gravels, up to 1 m thick, and boulder concentrations. Erosion surfaces and associated sediments record episodic scouring by subglacial meltwaters and provide potential "hydraulic windows" for the movement of surface contaminants through the till into underlying aquifers.

scholarly journals Shallow Seismic Reflection Profiles, West of Mt. Tsukuba

1995 ◽  
Vol 48 (1) ◽  
pp. 1-9
Author(s):  
Kazuo YAMAGUCHI ◽  
Tsutomu KIGUCHI ◽  
Takanobu YOKOKURA ◽  
Yasuto KUWAHARA
Keyword(s):  
Seismic Reflection ◽  
Shallow Seismic ◽  
Seismic Reflection Profiles

scholarly journals A 2D Seismic Reflection and Interpretation Study of the Khan Al-Baghdadi area within the Palaeozoic Era (western Iraq)

2021 ◽  
pp. 2627-2639
Author(s):  
Ali M. Abdullah ◽  
Ali M. Al-Rahim ◽  
Kanaan A. Jassem
Keyword(s):  
Instantaneous Frequency ◽  
Seismic Reflection ◽  
Synthetic Seismogram ◽  
Western Desert ◽  
The West ◽  
West Side ◽  
Western Desert Of Iraq ◽  
Seismic Reflectors ◽  
General Slope ◽  
East West

     This research deals with a 2D seismic structural and stratigraphic interpretation of Khan Al-Baghdadi area which is located in the western part of Iraq in Anbar governorate. Two main seismic reflectors are identified within the Silurian and Ordovician; these are the Hot_shale_1 within Akkas Formation and the Top Khabour Formation, which were deposited during the Paleozoic, based on synthetic seismogram of Akk_3 well near the study area. Time, depth, and velocity maps show the presence of two anticline structures trending east-west and located on the west side of the study area. The first is the Tulul structure (here denoted as A) and the second is denoted as B. Also, the maps show the increase in time towards the eastern side of the study area. The general slope of the reflectors is towards the southeast and the increase in the thickness of formations is gradually to the southwest and the northwest sides of the study area. The direct hydrocarbon indicator (DHI) was identified as sand lenses and flat spots on the studied reflectors, when applying seismic attributes like the instantaneous phase and the instantaneous Frequency), which give indicators of potential hydrocarbon accumulations. The primary reservoir in the study area is sandstone within the Khabour Formation, while the source and seal rocks are in the Hot_shale within Akkas Formation. They are interpreted to be present throughout Akkas Field, as gas-condensate accumulations, 100 km to the west of the study area and demonstrate the viability of the Paleozoic petroleum system in the Western Desert of Iraq.

scholarly journals High resolution shallow seismic reflection profiles from the Fraser Delta, Tsawwassen, British Columbia

1987 ◽  
Author(s):  
S E Pullan ◽  
J A Hunter ◽  
R M Gagné ◽  
R A Burns ◽  
R L Good
Keyword(s):  
British Columbia ◽  
High Resolution ◽  
Seismic Reflection ◽  
Shallow Seismic ◽  
Seismic Reflection Profiles

scholarly journals The Wishbone Ridge at the Chatham Rise Intersection: Structural Characteristics and Tectonic Implications

2021 ◽  
Author(s):  
◽  
Rachel Barrett
Keyword(s):  
New Zealand ◽  
Seismic Reflection ◽  
Structural Characteristics ◽  
Gravity Data ◽  
Large Igneous Province ◽  
Magnetic Data ◽  
The West ◽  
Satellite Gravity ◽  
Gondwana Margin ◽  
Seismic Reflection Profiles

<p>Geophysical data show that the West Wishbone Ridge, offshore of eastern New Zealand, is best described as having previously been a crustal transform fault, which first propagated along the eastern margin of the Hikurangi Plateau as subduction along the New Zealand sector of the Gondwana margin began to slow and reorientate between 105 and 101 Ma. Variation in the strike of the West Wishbone Ridge has resulted in contrasting compressional and extensional zones along the ridge. These regimes reflect the direction of strike offset from the direction of fault propagation, and constrain the sense of motion along the West Wishbone Ridge as having been dextral.  We find evidence that Cretaceous subduction along the Chatham Rise margin extended east of the margin offset at 174°W that marks the edge of Hikurangi Plateau subduction beneath the margin. Rotation of the Chatham Rise margin between 105 and 101 Ma was accommodated by westward broadening of the extensional zone of deformation associated with the West Wishbone Ridge near its intersection with the Chatham Rise. The amount of offset along the ridge indicates that significant transform motion along the West Wishbone Ridge south of ~40.5°S ceased ca. 101 Ma, coeval with the cessation of spreading of the Osbourn Trough, and of subduction of the Hikurangi Plateau.  Additionally, we find anomalously thick oceanic crust adjacent to the WWR and north of the Hikurangi Plateau (>12 km thick). This is attributed to the proximity of this crust to the Hikurangi Plateau Large Igneous Province.  The results of this study are based on seismic reflection and magnetic data recently collected during the 2016 R/V Sonne survey SO-246, as well as previously collected seismic reflection profiles and satellite gravity data.</p>

scholarly journals "Optimum Offset" Shallow Seismic Reflection Profiles From the Okanagan Valley, British Columbia

1992 ◽  
Author(s):  
S E Pullan ◽  
J A Hunter ◽  
R A Burns ◽  
R L Good
Keyword(s):  
British Columbia ◽  
Seismic Reflection ◽  
Shallow Seismic ◽  
Seismic Reflection Profiles ◽  
Okanagan Valley
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