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...