Three-dimensional deep S-wave velocity model of the South San Francisco Bay Area obtained from three-component microtremor measurements and microtremor array measurements

2020 ◽  
Author(s):  
Koichi Hayashi ◽  
Stefan Burns
Keyword(s):  
San Francisco ◽  
Wave Velocity ◽  
San Francisco Bay ◽  
San Francisco Bay Area ◽  
Three Dimensional ◽  
Velocity Model ◽  
S Wave ◽  
Bay Area ◽  
Array Measurements ◽  
Microtremor Measurements

On: “Field measurements of azimuthal anistropy: First 60 meters, San Francisco Bay area, CA, and estimation of the horizontal stresses' ratio from Vs1/Vs2” by Heloise Bloxsom Lynn (June 1991 GEOPHYSICS, p. 822–832)

Geophysics ◽  
1992 ◽  
Vol 57 (4) ◽  
pp. 653-655
Author(s):  
D. F. Winterstein
Keyword(s):  
San Francisco ◽  
San Francisco Bay ◽  
San Francisco Bay Area ◽  
Field Measurements ◽  
Azimuthal Anisotropy ◽  
S Wave ◽  
Near Surface ◽  
Inappropriate Use ◽  
Bay Area ◽  
Surface Materials

What I would like to discuss has little to do with the content of Heloise Lynn’s paper, which beautifully illustrates S‐wave birefringence in near‐surface materials. My concern is with the terminology. Inappropriate use of the term azimuthal anisotropy has become so prevalent in both oral and written presentations that someone needs to point out clearly and in detail why such usage is ill‐advised. My comments, thus, while triggered by the usage of this paper, are for an audience that includes many besides the paper’s author.

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