Inversion for an inversely dispersive profile

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Gerhard Heymann
Posts: 1
Joined: Wed Jan 23, 2013 2:07 pm

Inversion for an inversely dispersive profile

Postby Gerhard Heymann » Tue Feb 19, 2013 2:11 pm

Dear Marc

Can Diner do the inversion analysis for an inversely dispersive ground profile?
We did CSW surface wave tests on a profile where a stiff gravel layer of 1m thickness was compacted over normally dispersive dune sand.
The Rayleigh wave dispersion data is shown below as Frequency (Hz) and Slowness (s/m).
The presence of the stiff surface layer appears to be confirmed by the decrease in slowness at higher frequencies.

I'm assuming that all the data is fundamental mode data.
Using Dinver I was able to find a ground model for which the low frequency data fits reasonably well up to about 50Hz, but not a model that fits the data at all frequencies. Do you have any suggestions on how to conduct such an inversion analysis?

9.4 0.00231
11.3 0.00245
11.9 0.00252
12.5 0.00266
12.9 0.00276
13.9 0.00294
14.8 0.00312
15.8 0.00338
16.6 0.00361
17.4 0.00400
18.9 0.00425
20.7 0.00451
22.3 0.00486
27.0 0.00482
29.3 0.00476
33.2 0.00464
37.1 0.00436
41.0 0.00419
46.9 0.00393
51.8 0.00377
57.6 0.00360
64.5 0.00342
69.3 0.00349
75.2 0.00341
82.0 0.00324
86.9 0.00307

Best regards

Gerhard Heymann

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