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The AAPG/Datapages Combined Publications Database
Showing 17,614 Results. Searched 195,364 documents.
Crustal Structure of Texas Coastal Plain Region
Ira H. Cram, Jr.
AAPG Bulletin
... correct. That is, the 3.9 km/sec refractor is due to compaction Table II. VELOCITY-THICKNESS DATA End_Page 1723...
1962
Upper Crustal Structure Derived from Seismic Refraction Experiments: Grand Banks of Eastern Canada
I. Reid, C.E. Keen
CSPG Bulletin
... resolve themselves into two groups, each of which is represented here by an interval velocity. Above the Avalon Unconformity, a velocity gradient...
1988
Abstract: Interferometric Approach to Complete Refraction Statics Solution; #90187 (2014)
Valentina Khatchatrian and Mike Galbraith
Search and Discovery.com
... will emphasize the desired refractor. Figure 3 represents an example of the refraction convolution stack (RCS) and refraction velocity stack (RVS...
2014
A Novel Method of Deriving Weathering Statics from First Arrival Refractions
G. W. Hollingshead, R. R. Slater
Pacific Section of AAPG
... the refractor velocity and I the intercept time, each first arrival may be reduced to an intercept time by subtracting a time equal to X/V. Figure 2...
1980
Weathering Statics Problem and First-Arrival Time Surfaces: ABSTRACT
Joong H. Chun, Chester A. Jacewitz
AAPG Bulletin
... for the simple model of a linear refractor and high frequency statics. In this case the specific criteria are: (1) the expected value of each distribution...
1982
Seismic-Refraction Study of Continental Margin East of Florida
R. E. Sheridan , C. L. Drake , J. E. Nafe , J. Hennion
AAPG Bulletin
... Cretaceous is a good refractor with a high velocity of 6.03 km./sec. This is in agreement with the velocities measured for Lower Cretaceous limestone...
1966
Geophysical Reconnaissance on African Shelf: I. Cape Town to East London
R. Leyden , M. Ewing , E. S. W. Simpson
AAPG Bulletin
... Cretaceous sedimentary Table 1. Buoy Survey Results Showing Velocity and Thickness End_Page 653------------------------------ rocks above...
1971
Abstract: P-wave and S-wave Near-surface Characterization in Northeast British Columbia (NEBC); #90174 (2014)
Liliana M. Zuleta and Don C. Lawton
Search and Discovery.com
... and the second ~140 m; to the east the refractor detected is at ~180 m. The S-velocity for the first layer is 350 m/s to 420 m/s, and 650 m/s to 800 m...
2014
Seismic Refraction Data from Sunda Shelf
Robert E. Houtz , Dennis E. Hayes
AAPG Bulletin
..., and is not used further herein. Velocity functions in the sediments were determined by linear regression analysis and clearly show marked differences...
1984
Wide-Angle Seismic-Reflection and -Refraction Data from the Solomon Islands
A. K. Cooper, R. A. Wood
Circum Pacific Council Publications
... the slope and intercept of the fitted lines to determine the thickness and velocity for each layer. Because a refractor is not generally observed...
1986
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)
... above the fresh bedrock. Figure 7 shows the curve of P-wave velocity plotted against SPT values. This curve shows a linear trend between P-velocities...
2006
Acoustic Properties of Sediment on the Southern Tonga Platform as Determined from Seismic Sonobuoy Studies
Jonathan R. Childs
Circum Pacific Council Publications
...) is the vertical rootmean-square acoustic velocity to-the boun dary. This equation is linear in x and t . If we measure the travel times along a reflection...
1985
Migration Velocity Analysis by Migration of Velocity Spectra
Craig J. Beasley, Rolf Klotz
Southeast Asia Petroleum Exploration Society (SEAPEX)
...” of DMO often can have the desirable action of removing linear noise (Chambers et al., 1984), it can be detrimental to choosing a migration-velocity...
1992
Refraction Statics, A Comparison Among Processing Contractors
Bambang Sudewo
Indonesian Petroleum Association
.... They affect velocity analysis, reflection continuity, resolution and apparent structure. When statics supplied from the field are inadequate...
1985
Abstract: Near Surface Anomalies and Solutions; #90211 (2015)
Todd Mojesky, David LeMeur, and Ali Karagul
Search and Discovery.com
... algorithms (GLI, GMG, ...). These assume a layered model of the earth, with refractor head waves propagating along locally continuous boundaries. In more...
2015
Structure Beneath Continental Shelf, Northeastern Gulf of Mexico
John W. Antoine , James L. Harding
AAPG Bulletin
... of these sediments can be determined by considering everything detected above the first refractor as water and then subtracting the water depth. Using this method...
1965
Refraction Shooting with Expendable Sonobuoys: GEOLOGICAL NOTES
J. Ewing , R. Leyden , M. Ewing
AAPG Bulletin
..., 1968, Velocity of deep-sea sediments from sonobuoy data: Jour. Geophys. Research, v. 73, p. 2615-2641. Le Pichon, X., J. Ewing, and R. E Houtz...
1969
The Deep Crustal Structure of the Wilkes Land Continental Margin
J. R. Childs, H. M. J. Stagg
Circum Pacific Council Publications
... and partially satisfies Houtz' conclusions concerning the linear relationship of velocity with travel time. T h e change in velocity gradient probably...
1987
Shallow Crustal Structure of the Solomon Islands Intra-Arc Basins from Sonobuoy Seismic Studies
A. K. Cooper, T. R. Bruns, R. A. Wood
Circum Pacific Council Publications
... on refractors in Figure 3. Horizon A is a velocity discontinuity found basinwide and believed to indicate a large increase in sedimentation rates (Pliocene...
1986
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
... travel times and this model was then converted into a density model using a linear relation between P velocity and density. Gravity anomalies computed from...
1979
AAPG Memoir 76, Chapter 18: Velocity Estimation for Pore-Pressure Prediction
David W. Bell
AAPG Special Volumes
..., the common assumption that the logarithm of velocity is linear in depth is not consistent with check shot data. A single, definitive relationship...
2001
Refraction tomography at the Nova Ni-Cu mine
Ian James, Graeme Hird, Andrew Fitzpatrick
Petroleum Exploration Society of Australia (PESA)
... are applied to account for the near-surface variations in refractor velocity and depth. This was performed using several methodologies, from layer-based...
2019
Chapter 10-part 3: 3-D Depth Image Interpretation
William L. Abriel, Joseph P. Stefani, Robert D. Shank, David C. Bartel
AAPG Special Volumes
... with the increase in image accuracy, comes the danger of not having the right earth velocity to make the corrections. Because depth imaging does...
2011
Influence of Lithology and Neogene Uplift on Seismic Velocities in Denmark: Implications for Depth Conversion of Maps
Peter Japsen
AAPG Bulletin
... of linearity normally will be valid over a larger range of depths. An inherent drawback in assuming a linear increase of velocity with depth...
1993
Problems with Plate Tectonics: The Labrador Sea
A. C. Grant
CSPG Bulletin
... of crustal origin, and the ancillary suppositions that oceanic crust is defined by a mantle-velocity refractor in the depth range 10-15 km...
1980