Maximize your software investment by using RAM Element’s simple graphic interface to quickly design trusses, continuous beams, and frames of all types. Quickly complete many other design tasks such as designing retaining walls, masonry walls, tilt-up walls, shear walls, or footings. May 30, 2009 Anyone know of a free 3-D Gravity Modeling Software? Posted by 5 years ago. Anyone know of a free 3-D Gravity Modeling Software? I am a masters student looking to do some 3-D gravity modeling and I can't seem to find a decent software. It would need to be windows or linux based.
Observed gravity changes as a function of time at a given location, you could measure this with the gravimeter in the lab. The changes are due to tidal effects, instrument drift, and in some cases real changes (e.g. motions on faults, swelling magma chambers). Tidal effects have a period of roughly 12 hours and our Worden gravimeter drifts at hundreths of a milligal per hour. The Scintrex CG3 drifts at a much lower rate and typically we have it set to take care of tidal correction internally.
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To accomodate mechanical and tidal drift problems so that they do not significantly affect our gravity determinations you will return to the base station in my lab every three hours or so during your gravity survey. You will discover that you get a slightly different meter reading at the base station every time you return. If you assume that real changes in gravity are minimal over the two to three hour interval of observation you can further assume that the error in observation over the interval is linear (of the form: error = m*time + b). You then make a simple linear correction to all your observations so that the drift-corrected observations at the base station are all equal; intervening measurements get the appropriate corrections..
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For an example relevant to the Worden gravimeter, assume that over two hours the meter reading at the base station changes from 2170.0 to 2171.2 giving a difference of 1.2 scale divisions over 120 minutes; the slope of your drift-correction is then 0.01 scale division/minute. Thus if you have an observation 15.5 minutes after the first occupation of the base station you have to remove 0.01*15.5 = .155 scale divisions from that observation. For the second observation at the base station you remove 0.01*120 = 1.2 scale divisions to get 2171.2-1.2 = 2170.0, the initial reading. The process for the CG3 is essentially the same except that the CG3 reads directly in milligals, thus you do not have to worry or think about scale divisions.