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A total of 16 people responded, comprising 7 from Europe, 6 from North America and 3 from Asia-Australia. Only 2 were purely commercial operators, with 13 from research institutions and one person doing both. Of course, a larger, more balanced commercial versus academic participation would have been desirable. Both commercial operators purchased both hardware and software. Of the researchers, all but two developed their own analysis and inversion software, but only one developed both hardware and software in-house. Selected results are now presented statistically and verbatim in tables.
Tables 1 to 3 show the comments received with respect to the questions on practical applications and limitations. Table 1 shows the broad range of field methods and depth penetration achieved with surface wave surveys. In Table 2, it appears that gross, site stiffness evaluation, down to about 20 m maximum depth, is the most common successful application of seismic surface waves. As seen in Table 3, half of the contributors preferred not to give figures on estimated model accuracy with depth, suggesting the strong site-dependency of results.
Figure 1 shows that dispersion images (for phase velocity measurement) and inverted results are considered the most vital …