Mapping indentations on salt flanks: A two‐dimensional model study

1994 ◽  
Author(s):  
Chih‐Ping J. Lu ◽  
Jerome R. Krebs
Keyword(s):  
Two Dimensional ◽  
Dimensional Model ◽  
Model Study ◽  
Two Dimensional Model

Model study of explosion-generated Rayleigh waves in a half space

1964 ◽  
Vol 54 (2) ◽  
pp. 475-484
Author(s):  
I. N. Gupta ◽  
C. Kisslinger
Keyword(s):  
Rayleigh Wave ◽  
Half Space ◽  
Rayleigh Waves ◽  
Radial Component ◽  
Two Dimensional ◽  
Source Depth ◽  
Dimensional Model ◽  
Retrograde Motion ◽  
Model Study ◽  
Two Dimensional Model

ABSTRACT The Rayleigh waves generated by an explosion on or in the interior of a two-dimensional model show that the source acts as a downward impulse when the shot is on or just below the surface, and as a buried source of compression for deeper shots. The seismograms are in agreement with established theory for the line source on or in a half-space. The source depth corresponding to the reversal of polarity of the Rayleigh wave is small, and appears to be equal to the radius of the zone of inelastic failure around the shot. The polarity reversal is a true indication of a change in the mechanism of Rayleigh wave generation, and is not related to the change from retrograde motion at the free surface to prograde motion in the interior associated with the change in sign of the radial component at depth.

Thermal structure of the Venus ionosphere: A two-dimensional model study

1986 ◽  
Vol 13 (1) ◽  
pp. 10-13 ◽  
Author(s):  
R. C. Whitten ◽  
R. P. Singhal ◽  
W. C. Knudsen
Keyword(s):  
Thermal Structure ◽  
Two Dimensional ◽  
Dimensional Model ◽  
Model Study ◽  
Two Dimensional Model

Implications of smaller concentrations of stratospheric OH: A two-dimensional model study of ozone perturbations

1981 ◽  
Vol 15 (9) ◽  
pp. 1583-1589 ◽  
Author(s):  
R.C. Whitten ◽  
W.J. Borucki ◽  
H.T. Woodward ◽  
L.A. Capone ◽  
C.A. Riegel ◽  
...  
Keyword(s):  
Two Dimensional ◽  
Dimensional Model ◽  
Model Study ◽  
Two Dimensional Model

Revised predictions of the effect on stratospheric ozone of increasing atmospheric N2O and chlorofluoromethanes: A two-dimensional model study

1983 ◽  
Vol 17 (10) ◽  
pp. 1995-2000 ◽  
Author(s):  
R.C Whitten ◽  
W.J Borucki ◽  
H.T Woodward ◽  
L.A Capone ◽  
C.A Riegel✠
Keyword(s):  
Stratospheric Ozone ◽  
Two Dimensional ◽  
Dimensional Model ◽  
Model Study ◽  
Two Dimensional Model

Dynamics of the Venus ionosphere: A two-dimensional model study

Icarus ◽  
1984 ◽  
Vol 60 (2) ◽  
pp. 317-326 ◽  
Author(s):  
R.C. Whitten ◽  
P.T. McCormick ◽  
D. Merritt ◽  
K.W. Thompson ◽  
R.R. Brynsvold ◽  
...  
Keyword(s):  
Two Dimensional ◽  
Dimensional Model ◽  
Model Study ◽  
Two Dimensional Model

scholarly journals SEISMIC MODEL STUDY OF REFRACTIONS FROM A LAYER OF FINITE THICKNESS

Geophysics ◽  
1954 ◽  
Vol 19 (3) ◽  
pp. 388-401 ◽  
Author(s):  
Frank Press ◽  
Jack Oliver ◽  
Maurice Ewing
Keyword(s):  
Travel Time ◽  
Layer Thickness ◽  
Finite Thickness ◽  
Selective Absorption ◽  
Two Dimensional ◽  
Seismic Model ◽  
Dimensional Model ◽  
Model Experiments ◽  
Model Study ◽  
Two Dimensional Model

Two dimensional model experiments on refractions from layers of finite thickness are described. Refractions can be unreliable for velocity and depth determinations when they occur with wavelengths which are large compared to the layer thickness. Discrepancies reported between refraction velocities and borehole velocities can be partially accounted for in this manner. Even simple two‐ and three‐layer models can show such effects as misleading second arrivals, echeloning of travel time curves, masked layers, and selective absorption in the overburden.

The stopping phase on seismograms

1965 ◽  
Vol 55 (1) ◽  
pp. 47-58
Author(s):  
J. C. Savage
Keyword(s):  
Free Surface ◽  
Seismic Event ◽  
Two Dimensional ◽  
Dimensional Model ◽  
Tentative Identification ◽  
Model Studies ◽  
Long Period ◽  
Model Study ◽  
Two Dimensional Model ◽  
First Motion

Abstract Model studies have demonstrated that the stopping phase, an event which originates at the termination of rupture, may be identified on long-period strain recordings. A tentative identification of the stopping phase has been made on ultra-long-period seismograms of three major earthquakes (Montana, 1959; Chile, 1960; and Alaska, 1964). The events chosen lead to reasonable estimates of the length of rupture associated with the earthquake. A second type of stopping event, the breakout phase, must occur when a rupture intersects a free surface. A two-dimensional model study indicates that the breakout phase should be a prominent seismic event, particularly if the first motion is emergent. A review of studies of seismograms of earthquakes which produced surface faulting indicates that a prominent second event is often observed. However, there does not appear to be an adequate criterion to distinguish the breakout phase from the pP phase. Thus no certain identification can be made.

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