Ellipticity joint inversion vith DC using Dinver 3.3.0. and following relaeases

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luigiV
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Joined: Fri Jul 17, 2020 9:28 am

Ellipticity joint inversion vith DC using Dinver 3.3.0. and following relaeases

Post by luigiV »

Hi Marc,
Using Dinver from Geopsy releases 3.3.0. and following I verified that the ellipticity curve is loaded in degrees (in absolute or signed value) instead of in amplitude as in previous versions. When I check the result, the plot appears with only the theoretical curves and the measured curve is missing. Sometimes it appears but very far from the models and often does not appear at all. I tried to select signed or absolute, but I don't get any positive results. This happens whether you use the complete curve or only the right side (as you suggest in curves without singularities). Can you please tell me why this happens and how I can go about overcoming this problem (provided it is not a bug)? I am attaching a picture for a better understanding.
Thanks a lot
Luigi
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Re: Ellipticity joint inversion vith DC using Dinver 3.3.0. and following relaeases

Post by admin »

Hi Luigi,

The first strange thing in your figure is the value of your data curve. Values must be restricted to -90 to 90 deg (or 0 to 90 deg. for absolute value). How did you import the curve into Dinver? 0 deg. corresponds to a null ellipticity, 90 deg. to an infinite ellipticity.

If you have a positive ellipticity and if you select "signed" ellipticity, Dinver will try to fit only with positive ellipticities. With "absolute", the sign is ignored when computing the misfit. Your data curve must be positive but the simulated ellipticities can be either positive or negative.

Best regards,

Marc

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