Filippo Biondi

And they, they transmit energy directly to the surface.

So the surface you find the sum of all the sources, principal sources that are located below.

Okay.

Just performing a Fourier transform.

So the spectrum, the spectrum of the time domain revelation that you have on the surface.

Just from one image.

Yes, because one image, but only on SAR, on synthetic aperture data, you can do this.

Why just on one image?

You see, any image is static, no?

It's not true.

A SAR image is dynamic.

It means that you can refocus this image according to a...

filtering process and while you filter this you can perform a sliding window filtering and so you can transform a static image into a small video that this small video in the time domain can belongs for maybe 10 seconds

That's a sufficient statistic, 10 seconds of video, to retrieve the superficial vibration in order to perform tomographic inversion.

Sorry if I was too technical, maybe.

I don't know, but it has to be done like that.

Yeah.

Understood.

Yeah.

No, it has to be explained.