Hi Mark. I think I understand what you’re looking for now.

In this case I would look too magnetic for a change in the surrounding area.

Because magnetic anomalies come from contrasts between relatively few rock types, quantitative analysis such as computing a depth to source is appropriate (if specifications of the data acquisition are known; in some data sets, such necessary parameters as magnetometer altitude may not be known). Gravity anomalies are caused by contrasts in all parts of the rock section and can therefore be misleading. It is possible for relatively shallow sources to be distributed in a way that produces a broad gravity anomaly, which would be expected to come from deep bodies of rock. Computer modeling is appropriate for both gravity and magnetic data analysis.

However the next time I’m over at my partners place in Gilroy I will give your though a test. Take Care…Don in creepy town.