Can gravity really detect a 200-m throw fault at a depth of 3000 m?

Such a question may be frequently asked when we interpret gravity data. At present, with gravity gradiometry available and the exploration activity in areas such as the Gulf of Mexico, another parallel question is raised.

Can gravity gradient data resolve a salt layer 200 m thick at 3000 m depth?

It is well known that qualitatively, gravity gradiometry is more sensitive than conventional gravimetry to shallow anomalous masses. However, in practice, we often need a more quantitative figure.

Down to what depth is gravity gradiometry better...

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