Use Vs(z) for Near-surface Static Corrections for Shear-wave Reflection Processing

Near-surface shear-wave (Vs) velocity models with depth, Vs(z), can be used for shear-wave reflection static corrections. Output text results can be represented as 1D, 2D, and 3D depth models for processing by other reflection-processing software.

Vs(z) for Compressional-wave Reflection Static Corrections

Compressional-wave velocity (Vp) can be obtained from MASW Vs(z). For example, it is a common practice to compare and correlate MASW Vs(z) to borehole Vs and Vp data, respectively, at several locations at a particular site. Then, based on established MASW Vs(z) versus Vp trends, corresponding 1D, 2D, and 3D Vp depth models can be estimated and used for Vp reflection statics.

Output Vs results are provided as:

(1) 3-column text file representing station (i.e., location), depth and Vs value:

1058.000 -0.856 585.355
1058.000 -1.926 585.293
1058.000 -3.264 565.995
1058.000 -4.937 549.454
1058.000 -7.028 580.101
1058.000 -9.641 629.486
1058.000 -12.908 707.283
1058.000 -16.991 790.891
1058.000 -22.095 801.687
1058.000 -27.619 981.095
1059.000 -0.856 576.936
1059.000 -1.926 565.989
1059.000 -3.264 532.418
1059.000 -4.937 532.905
1059.000 -7.028 599.285
1059.000 -9.641 648.005
1059.000 -12.908 704.946
1059.000 -16.991 795.710
1059.000 -22.095 843.153
1059.000 -27.619 953.971
1060.000 -0.856 553.895
1060.000 -1.926 552.318
1060.000 -3.264 511.031
1060.000 -4.937 512.078
1060.000 -7.028 587.717
1060.000 -9.641 657.279
1060.000 -12.908 713.834
1060.000 -16.991 783.495
1060.000 -22.095 841.041
1060.000 -27.619 983.042

(2) GS ASCII grid format (i.e., a text format) compatible with 3rd party software (e.g., Surfer)

View example grid...