Synthetic seismogram modeling of shear-wave splitting in VSP data from the Geysers, California

1988 ◽  
Vol 15 (10) ◽  
pp. 1085-1088 ◽  
Author(s):  
Peter M. Shearer
Keyword(s):  
Shear Wave ◽  
Shear Wave Splitting ◽  
Synthetic Seismogram ◽  
Wave Splitting ◽  
Vsp Data ◽  
The Geysers

Shear-wave splitting from local earthquakes at the Geysers Geothermal Field, California

1995 ◽  
Vol 22 (4) ◽  
pp. 501-504 ◽  
Author(s):  
John R. Evans ◽  
Bruce R. Julian ◽  
G. R. Foulger ◽  
Alwyn Ross
Keyword(s):  
Shear Wave ◽  
Shear Wave Splitting ◽  
Geothermal Field ◽  
Local Earthquakes ◽  
Wave Splitting ◽  
The Geysers

Shear‐wave splitting measurements from multishot VSP data

1988 ◽  
Author(s):  
L. Nicoietis ◽  
C. Client ◽  
R. Lefeuvre
Keyword(s):  
Shear Wave ◽  
Shear Wave Splitting ◽  
Wave Splitting ◽  
Vsp Data

Estimating interval shear-wave splitting from multicomponent virtual shear check shots

Geophysics ◽  
2008 ◽  
Vol 73 (5) ◽  
pp. A39-A43 ◽  
Author(s):  
Andrey Bakulin ◽  
Albena Mateeva
Keyword(s):  
Shear Wave ◽  
Shear Wave Splitting ◽  
Azimuthal Anisotropy ◽  
Data Set ◽  
Vertical Seismic Profiling ◽  
Wave Splitting ◽  
Vsp Data ◽  
Classic Approach ◽  
A New Technique

Measuring shear-wave splitting from vertical seismic profiling (VSP) data can benefit fracture and stress characterization as well as seismic processing and interpretation. The classic approach to measuring azimuthal anisotropy at depth involves layer stripping. Its inherent weakness is the need to measure and undo overburden effects before arriving at an anisotropy estimate at depth. That task is challenging when the overburden is complex and varies quickly with depth. Moreover, VSP receivers are rarely present all the way from the surface to the target. That necessitates the use of simplistic assumptions about the uninstrumented part of the overburden that limit the quality of the result. We propose a new technique for measuring shear-wave splitting at depth that does not require any knowledge of the overburden. It is based on a multicomponent version of the virtual source method in which each two-component (2-C) VSP receiver is turned into a 2-C shear source and recorded at deeper geophones. The resulting virtual data set is affected only by the properties of the medium between the receivers. A simple Alford rotation transforms the data set into fast and slow shear virtual check shots from which shear-wave splitting can be measured easily and accurately under arbitrarily complex overburden.

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