Determination of sub‐seismic fracturation using azimuthal variations of seismic velocities

2004 ◽  
Author(s):  
Berthet Philippe ◽  
Philippe Julien ◽  
Jean‐Pierre Dunand ◽  
Jean Arnaud
Keyword(s):  
Seismic Velocities

SEISMIC VELOCITIES FROM SURFACE MEASUREMENTS

Geophysics ◽  
1955 ◽  
Vol 20 (1) ◽  
pp. 68-86 ◽  
Author(s):  
C. Hewitt Dix
Keyword(s):  
Accurate Determination ◽  
Careful Study ◽  
Seismic Velocities ◽  
Multiple Reflections ◽  
Seismic Reflection Data ◽  
Reflection Data ◽  
Surface Measurements ◽  
Secondary Objective ◽  
Interval Velocities

The purpose of this paper is to discuss field and interpretive techniques which permit, in favorable cases, the quite accurate determination of seismic interval velocities prior to drilling. A simple but accurate formula is developed for the quick calculation of interval velocities from “average velocities” determined by the known [Formula: see text] technique. To secure accuracy a careful study of multiple reflections is necessary and this is discussed. Although the principal objective in determining velocities is to allow an accurate structural interpretation to be made from seismic reflection data, an important secondary objective is to get some lithological information. This is obtained through a correlation of velocities with rock type and depth.

scholarly journals Determination of Temperature on Ice Caps by Seismic Methods

1968 ◽  
Vol 7 (50) ◽  
pp. 333-335 ◽  
Author(s):  
F. Thyssen
Keyword(s):  
Empirical Formula ◽  
Temperature Measurements ◽  
Seismic Velocities ◽  
P Waves ◽  
Ice Caps ◽  
Seismic Methods ◽  
The Mean

An empirical formula, derived by the author for the seismic velocities of P waves in glaciers and ice caps, is used to determine the temperatures which can be deduced from the maximum and the mean vertical velocities. With the aid of several examples from previous publications, these temperatures are discussed and, as far as they are available, direct temperature measurements are compared with the derived temperatures.

scholarly journals Determination of Temperature on Ice Caps by Seismic Methods

1968 ◽  
Vol 7 (50) ◽  
pp. 333-335
Author(s):  
F. Thyssen
Keyword(s):  
Empirical Formula ◽  
Temperature Measurements ◽  
Seismic Velocities ◽  
P Waves ◽  
Ice Caps ◽  
Seismic Methods ◽  
The Mean

An empirical formula, derived by the author for the seismic velocities of P waves in glaciers and ice caps, is used to determine the temperatures which can be deduced from the maximum and the mean vertical velocities. With the aid of several examples from previous publications, these temperatures are discussed and, as far as they are available, direct temperature measurements are compared with the derived temperatures.

scholarly journals Equation of state and sound wave velocities of fayalite at high pressures and temperatures: implications for the seismic properties of the martian mantle

2021 ◽  
Vol 33 (4) ◽  
pp. 519-535
Author(s):  
Frédéric Béjina ◽  
Misha Bystricky ◽  
Nicolas Tercé ◽  
Matthew L. Whitaker ◽  
Haiyan Chen
Keyword(s):  
High Pressures ◽  
Linear Trend ◽  
Seismic Velocities ◽  
X Ray Diffraction ◽  
Shear Moduli ◽  
Seismic Properties ◽  
Wave Velocities ◽  
Seismic Experiment ◽  
Ultrasonic Interferometry

Abstract. The elastic properties of a pure, synthetic fayalite aggregate were studied by coupled synchrotron X-ray diffraction and ultrasonic interferometry in a DIA-type multi-anvil press. Measurements at pressures up to about 7 GPa and temperatures up to 873 K yielded an adiabatic bulk modulus, KS0=127.2±0.3 GPa with (∂KS/∂P)T0=6.5±0.1, and a shear modulus, G0=53.3±0.4 GPa with (∂G/∂P)T0=1.25±0.05. When fixing (∂KS/∂P)T0=5.3 (after (∂KT/∂P)T0 from Nestola et al., 2011), KS0 increases to about 130 GPa. These estimates of (KS0,(∂KS/∂P)T0) follow a general linear trend, K=f(dK/dP), for fayalite. We define limited ranges for both bulk and shear moduli from previous studies, and we discuss how these variations affect seismic velocities and the determination of a mineralogical model in the context of the Mars InSight SEIS (Seismic Experiment for Interior Structure) experiment.

scholarly journals Background resistivity model from seismic velocities

Geophysics ◽  
2013 ◽  
Vol 78 (4) ◽  
pp. E213-E223 ◽  
Author(s):  
Dieter Werthmüller ◽  
Anton Ziolkowski ◽  
David Wright
Keyword(s):  
Structural Information ◽  
Rock Physics ◽  
Feasibility Studies ◽  
Real Data ◽  
Seismic Velocities ◽  
Electromagnetic Data ◽  
The North ◽  
Resistivity Model ◽  
The North Sea

We developed a methodology to estimate resistivities from seismic velocities. We applied known methods, including rock physics, depth trends, structural information, and uncertainty analysis. The result is the range of background resistivity models that is consistent with the known seismic velocities. We successfully tested the methodology with real data from the North Sea. These 2D or 3D background resistivity models yield a detailed insight into the background resistivity, and they are a powerful tool for feasibility studies. They could also serve as starting models or constraints in (iterative) forward modeling of electromagnetic data for the determination of subsurface resistivities.

Galactic orbits of stars

1966 ◽  
Vol 25 ◽  
pp. 93-97
Author(s):  
Richard Woolley
Keyword(s):  
Globular Cluster ◽  
Potential Field ◽  
High Velocity ◽  
Velocity Vector ◽  
Variable Stars ◽  
The Sun ◽  
Proper Motions ◽  
Rr Lyrae ◽  
The Galaxy

It is now possible to determine proper motions of high-velocity objects in such a way as to obtain with some accuracy the velocity vector relevant to the Sun. If a potential field of the Galaxy is assumed, one can compute an actual orbit. A determination of the velocity of the globular clusterωCentauri has recently been completed at Greenwich, and it is found that the orbit is strongly retrograde in the Galaxy. Similar calculations may be made, though with less certainty, in the case of RR Lyrae variable stars.

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