Gravity Quiz 1 - Noise

The primary factor that determines whether a structure having any particular combination of parameters can be mapped with a gravity survey is the ratio of the signal (the size and shape of the anomaly) to the noise (the size and shape of the effect of all of the other sources combined).

On the left side of the table shown below are five corrections that are normally applied to raw gravity observations to reduce the noise to a level that allows for the signal to be interpreted. For the problem stated in the RFB, indicate whether each source of noise is

• Intrinsic (there is nothing you can do about it)
• Predictable (you can calculate a correction and remove it)
• Controllable (you can't remove it completely, but you can reduce it to an acceptable level)
• Unimportant (it's not a factor for this survey).

Check the box under the best choice for each correction. If you feel any of your entries would be ambiguous, check the ambiguous box and write a brief explanation of why in the text field below the table.