A couple GravCadW problems:

1. Imagine you are working in a groundwater system where the general depth to bedrock (2,750 kg/m^3) is 125 meters. The average density of the sediments in the basin is 2,100 kg/m^3. Suppose an apparent divide in groundwater flow causes you to suspect a local bedrock high in the basin. The bedrock high is 500 meters wide, very long, and sticks up into the sediments. Suppose you think the bedrock high must be about 75 meters below the surface. What does the expected anomaly look like? What station spacing would you propose for a gravity survey? What must your precision be to see the anomaly from the proposed bedrock high?

2. The Mission fault separates Precambrian Belt Supergroup (2,800 kg/m^3) from Tertiary valley fill (2200 kg/m^3). The fault dips west at about 60o near the surface. Suppose there is some question about the subsurface dip of the fault. Can you use a gravity survey to distinguish between a dip at depth (say 10 to 15 km) of 30 degrees versus 60 degrees? Use GravcadW to present your case.