Geology Q-A Chapters 2 � 3

Geology Q-A Chapters 2 � 3 - Danny West April 12,...

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Danny West April 12, 2008 Geology 161 Chapters 2 – 3 Chapter 2 1. What is the difference between a positive and a negative anomaly? A positive anomaly is above the surrounding average. A negative anomaly is below the surrounding average. 2. A profile across a known subsurface body fails to show an anomaly. This might be because of which of the following? It could be due to small signal-to-noise ratio, data that has not been reduced, station spacing was too large, instrument was not sensitive enough, or the body does not differ from its surrounding in the physical property being measured. 3. The purpose of stacking is to: Display the result more clearly and improve the signal-to-noise ratio. 4. To deduce the possible shape of the body producing a very elongated anomaly, the observed anomaly found by surveying along a single traverse is compared with the one calculated for a body assumed to be uniform and horizontal, and extend a long way to either side of the traverse. This is an example of:
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Geology Q-A Chapters 2 � 3 - Danny West April 12,...

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