Map showing the geologic structure of the continental shelf southeast and southwest of Kodiak Island, Alaska, from 24-fold seismic data

1982 ◽  
Keyword(s):  
Continental Shelf ◽  
Seismic Data ◽  
Geologic Structure ◽  
Kodiak Island

T phases from 80 Alaskan earthquakes, March 28-31, 1964

1965 ◽  
Vol 55 (1) ◽  
pp. 59-63
Author(s):  
John Northrop
Keyword(s):  
Continental Shelf ◽  
Island Area ◽  
Kodiak Island ◽  
Phase Signal ◽  
T Phase

Abstract A large T-phase signal was received at Pt. Sur, California, from the Alaskan earthquake of March 28, 1964. Additional T phases were received from 90 per cent of the 80 aftershocks studied in the Kodiak Island area. The largest T phases were received from hypocenters beneath the upper portion of the continental shelf.

On: “Seismic contouring: A unique skill” by P. M. Tucker (GEOPHYSICS, 53, 741–749, June 1988).

Geophysics ◽  
1989 ◽  
Vol 54 (2) ◽  
pp. 267-270
Author(s):  
Donald S. Stone
Keyword(s):  
Seismic Data ◽  
Three Dimensional ◽  
Geologic Structure ◽  
High Expectations ◽  
Structural Interpretation

As a happy owner of the popular SEG monographs by Tucker and Yorston (1973) and Tucker (1982), the appearance of Tucker (1988) as the leadoff article in the June, 1988 issue of Geophysics caught my attention, and I began reading with high expectations. Admitting that the paper was chiefly about the philosophy and mechanics of contouring seismic data, I nevertheless found it disappointing, primarily because in describing his unique seismic contouring skill, Tucker never mentions migration or its importance in the conversion of raw seismic times to three‐dimensional (3-D) geologic structure. Also, many of the statements in his paper can be challenged on the grounds of imprecision or omission in terms of real structural interpretation.

Inline delayed-shot migration in tilted elliptical-cylindrical coordinates

Geophysics ◽  
2010 ◽  
Vol 75 (5) ◽  
pp. S187-S197 ◽  
Author(s):  
Jeffrey Shragge ◽  
Guojian Shan
Keyword(s):  
Impulse Response ◽  
Seismic Data ◽  
Finite Difference Methods ◽  
Computational Cost ◽  
Coordinate Systems ◽  
Geologic Structure ◽  
Data Set ◽  
Implicit Finite Difference ◽  
Wavefield Extrapolation ◽  
Generalized Coordinate

Riemannian wavefield extrapolation, a one-way wave-equation method for propagating seismic data on generalized coordinate systems, is extended to inline delayed-shot migration using 3D tilted elliptical-cylindrical (TEC) coordinate meshes. Compared to Cartesian geometries, TEC coordinates are more conformal to the shape of inline delayed-source impulse response, which allows the bulk of wavefield energy to propagate at angles lower to the extrapolation axis, thus improving global propagation accuracy. When inline coordinate tilt angles are well matched to the inline source ray parameters, the TEC coordinate extension affords accurate propagation of both steep-dip and turning-wave components important for successfully imaging complex geologic structure. Wavefield extrapolation in TEC coordinates is no more complicated than propagation in elliptically anisotropic media and can be handled by existing implicit finite-difference methods. Impulse response tests illustrate the phase accuracy of the method and show that the approach is free of numerical anisotropy. Migration tests from a realistic 3D wide-azimuth synthetic derived from a field Gulf of Mexico data set demonstrate the imaging advantages afforded by the technique, including the improved imaging of steeply dipping salt flanks at a reduced computational cost.

Pliocene–Quaternary evolution of the continental shelf of central Vietnam based on high resolution seismic data

2014 ◽  
Vol 79 ◽  
pp. 529-539 ◽  
Author(s):  
Mai Thanh Tan ◽  
Le Van Dung ◽  
Le Duy Bach ◽  
Nguyen Bieu ◽  
Tran Nghi ◽  
...  
Keyword(s):  
High Resolution ◽  
Continental Shelf ◽  
Seismic Data ◽  
Central Vietnam

scholarly journals Re-evaluation of the geology of the southern West Greenland shelf - Project VEST SOKKEL

1990 ◽  
Vol 148 ◽  
pp. 29-32
Author(s):  
J.A Chalmers
Keyword(s):  
Continental Shelf ◽  
Seismic Data ◽  
West Greenland ◽  
Multichannel Seismic Data

From 1970 to 1977 approximately 40000 km of multichannel seismic data were acquired between latitudes 63°N and 68°N on the continental shelf of southern West Greenland. In 1976 and 1977 five wells were drilled to explore for hydrocarbons, but all of them were dry. All exploration licences were relinquished by 1979.

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