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The AAPG/Datapages Combined Publications Database

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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...


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...


Abstract: Interferometric Approach to Complete Refraction Statics Solution; #90187 (2014)

Valentina Khatchatrian and Mike Galbraith

Search and

... will emphasize the desired refractor. Figure 3 represents an example of the refraction convolution stack (RCS) and refraction velocity stack (RVS...


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...


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...


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...


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...


Abstract: P-wave and S-wave Near-surface Characterization in Northeast British Columbia (NEBC); #90174 (2014)

Liliana M. Zuleta and Don C. Lawton

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... 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...


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...


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...


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...


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...


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...


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...


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...


Abstract: Near Surface Anomalies and Solutions; #90211 (2015)

Todd Mojesky, David LeMeur, and Ali Karagul

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... algorithms (GLI, GMG, ...). These assume a layered model of the earth, with refractor head waves propagating along locally continuous boundaries. In more...


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...


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...


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...


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...


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...


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...


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...


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...


Chart Migrations

Frank A. Roberts

Oklahoma City Geological Society

.... They will be: Concentric circles, if velocity is assumed to be constant through the geologic section. Circles, but not concentric, if linear increase...


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