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The AAPG/Datapages Combined Publications Database
Showing 17,097 Results. Searched 200,357 documents.
Some Applications and Problems of the Seismic Refraction Technique in Civil Engineering Projects in Malaysia
B. K. Lim, S. J. Jones
Geological Society of Malaysia (GSM)
... of these weathered zones within the bedrock. 6 In general, seismic returns from the bedrock are poor when the bedrock refractor is poorly defined and highly...
1982
Wide-Angle Seismic-Reflection and -Refraction Data from the Solomon Islands
A. K. Cooper, R. A. Wood
Circum Pacific Council Publications
...) in areas where geologic or bathymetric features were thought to be either flat or uniformly dipping over the length of the sonobuoy station, (2) in areas...
1986
Geology of the Offshore Southeast Georgia Embayment, U.S. Atlantic Continental Margin, Based on Multichannel Seismic Reflection Profiles: Rifted Margins
Richard T. Buffler , Joel S. Watkins , William P. Dillon
AAPG Special Volumes
.... the sedimentary section onlaps a regional unconformity characterized by a strong, smooth reflector/high-velocity refractor (5.8 to 6.3 km/sec). Rocks below...
1979
The Use of the Seismograph Tool in the Western Canadian Foothills
L. H. Reed
CSPG Special Publications
.... In steeply dipping, complexly folded and faulted areas, ambiguity or absence of refraction or reflections on the seismograms frequently occur. Severe...
1957
Geophysical Reconnaissance on African Shelf: I. Cape Town to East London
R. Leyden , M. Ewing , E. S. W. Simpson
AAPG Bulletin
... the Paleozoic Cape Series. Our buoys 231-233 along the shelf edge, seaward of the Algoa basin, indicate a gradual eastward shoaling of the deepest refractor...
1971
Developments in New Zealand and Southwest Pacific Island Region in 1979
H. R. Katz
AAPG Bulletin
..., uncontrollable hole deviation in the direction of dipping strata increased to 9° at only 511-m depth, gradually reducing again at greater depth...
1980
Integrating Geophysical and Trench Data to Analyze Shallow Faulting in the Wasatch Fault Zone Near Provo, Utah County, Utah
Alvin K. Benson, Nathan Brett Mustoe, James N. Carver
Utah Geological Association
... data processing involves identifying velocity breaks and plotting travel-times versus distance, determining refractor velocities, calculating delay...
1995
Seismic Techniques in the Alberta Foothills
L. H. Reed
CSPG Special Publications
... depths, rough surface topography encountered nearer the mountain front, or steeply dipping surface beds. Often the changing character...
1953
Abstract: Constraining Anisotropy Lessons from 2D Modeling; #90211 (2015)
Rob Holt
Search and Discovery.com
... between anisotropy and ray bending is complex. In certain cases, notably the VTI case with the same amount of anisotropy on either side of the refractor...
2015
Geological Outline of the Norwegian Continental Margin Between 60° and 68° North
Eirik Sundvor, Eigill Nysaether
CSPG Special Publications
...° and is predominantly to the northwest. Two exceptions to the north-west dipping strata are found in the two basins on either side of the Lofoten Islands...
1975
Two-dimensional seismic refraction tomography of a buried bedrock valley at Hallsands beach, Devon, United Kingdom
Eric B. Avalos, David H. Malone, Eric W. Peterson, William P. Anderson, and Roland W. Gehrels
Environmental Geosciences (DEG)
... information on the geologic unit such as depth to refractor and dipping or horizontal refractor (Lankston, 1989; Al-Saigh and Al-Dabbagh, 2010). Despite...
2016
Seismic-Profiler Survey of Blake Plateau
John Ewing , Maurice Ewing , Robert Leyden
AAPG Bulletin
..., but in traverses G and H it continues to the edge. The topography of reflector 1 generally is conformable with that of the sea floor, dipping gently eastward...
1966
The Deep Crustal Structure of the Wilkes Land Continental Margin
J. R. Childs, H. M. J. Stagg
Circum Pacific Council Publications
... by Le Pichon et al. ( 1 9 6 8 ) . Both refraction and reflection results were corrected for dipping interfaces, calculated from time differences measured...
1987
ABSTRACT: Implication of Dipping Anisotropy
D. C. Lawton
CSPG Special Publications
...ABSTRACT: Implication of Dipping Anisotropy D. C. Lawton 1998 105 105...
1998
Western Canadian Continental Shelf
D. H. Shouldice
CSPG Special Publications
.... This section shows an east-dipping fault on the west flank of the anticline cutting all of the seismic reflections. Figure 23 is a shallow-penetration sparker...
1973
Geology of the Western Canadian Continental Shelf
D. H. Shouldice
CSPG Bulletin
... character. Paleontological data from some wells in this basin suggest melange. This section shows an east-dipping fault on the west flank...
1971
Seismic Processing in the Papua New Guinea Fold Belt - Recent Experience
N. J. Fisher, F. R. Nicholson
Papua New Guinea (PNG) Petroleum Convention Proceedings
... and should provide fairly good estimates of the refractor velocity and delay time. It is also necessary to provide a variable estimate...
2000
1.5 Crustal Sections: A Wide Angle Seismic Profile
V. J. Hughes, R. S. White, E. J. W. Jones, D. H. Matthews, J. A. Brewer, and D. K. Smythe
AAPG Special Volumes
..., atlas volume 3). However, some moderately easterly-dipping features do occur (for example, between 2 to 4 secs), which by comparison with similar...
1983
Paleomagnetic results from Mayreau, West Indies, rule out large tectonic rotations since the Eocene
Speed, R.G., Burmester, R.F. and Beck, M.E.
Geological Society of Trinidad & Tobago
... depths to a high speed crustal refractor and of a gravity maximum. The refractor is interpreted as the top of oceanic crust of the Grenada Basin (Speed...
1995
Marine Seismic Investigations, Southern Brazil Margin
R. Kowsmann , R. Leyden , O. Francisconi
AAPG Bulletin
.... The location of the transition corresponds to the Rio Grande fault of Miranda (1970). The 6.2-km/sec refractor in sonobuoy profile 123 may represent...
1977
Geophysical Results From the Continental Margin Off Southern Baffin Island
A. C. Grant
CSPG Special Publications
... the sill off Hudson Strait (km 0-20), and to the east (km 20-70) shows a buried erosional surface cut on dipping coastal plain-type strata assumed...
1975
Geophysical Studies of the Continental Slope, Scarp, and Basin, Eastern Gulf of Mexico.
J. W. Antoine, B. R. Jones
GCAGS Transactions
... by Antoine and Ewing (1936) crosses the Western Florida Escarpment at approximately 25°30N and a noticeable upturning of the refractor with a velocity...
1967
2D Seismic Refraction Tomography Survey on Metasediment at a Proposed Development Site in Dengkil, Selangor
Umar Hamzah, Abd Rahim Samsudin
Geological Society of Malaysia (GSM)
... of refractor surfaces across a profile. However the subsurface velocity can be complex especially in areas dominated by dipping metasedimentary rocks, making...
2006
Explosion Seismology Studies of Active and Passive Continental Margins: Resources, Comparative Structure, and Eustatic Changes in Sea Level
B. Keller , B. T. R. Lewis , C. Meeder , C. Helsley , R. P. Meyer
AAPG Special Volumes
... of this study show a steeply dipping (30°) seismic zone about 30 km thick (Barazangi and Isacks, 1976). The line of active Andean volcanoes is about 280 km...
1979
Geologic Framework of the Alaskan Continental Terrace in the Chukchi and Beaufort Seas
Arthur Grantz, Mark L. Holmes, Bruce A. Kososki
CSPG Special Publications
... in origin. Diapirs (of Cretaceous shale?) pierce the gently northward-dipping strata of this basin, in places reaching the sea floor. Thick Tertiary...
1975