Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
EPSC 454 – Exploration and Environmental Geophysics PROBLEM SET #1 (Gravity) DUE: September 14, 2016 1. A large room in a cave has an approximate radius of 20 meters. The surrounding rock has density of 2400 kg/m3. What would be the maximum gravity anomaly if the depth of the room were 80 meters? If the gravimeter is accurate to 0.01 mGal, theoretically, would the room be detectable at 150 meters depth? 300m? 600m? What is the half width of the anomaly at these depths? What survey spacing would you use for each of these depths? 2. A flat lying iron formation has a density contrast of 200 kg/m3 with the surrounding rock and covers an area of 1 km2. What is the thickness of the iron formation if it produces an anomaly of 3.5 mGal? What is the total mass of the formation? If the surrounding rock is density 2670 kg/m3, and the higher density of the iron formation is attributable to the iron, what is the total mass of the iron in the formation? 3. Do problem 6-4 in Burger. (note – these problem numbers are the same in both editions of the book, at least for this chapter.) 4. Do problem 6-10 in Burger.