Microgravity Services- Brochure

SPOTLIGHTGEOPHYSICAL SERVICESFor more information, contact Spotlight Geophysical Services at info@spotlightgeo.com on the web at www.spotlightgeo.comMicrogravityA gravity survey measures changes in the Earth’s gravity due to subsurface density variations.is a termused to indicateaprecisiongravity survey inwhichnear surface featuresareofinterest. These features may include lateral changes in soil or rock density, buried channels, largefractures, faults, dissolution-enlarged joints and cavities. Amicrogravity survey can be used tomapthe lateral boundaries of anomalous features, estimate the amount of missing mass within ananomalousarea, andguideconfirmatoryborings.Microgravity??????Non-invasivelymap karst features (caves, conduits,dissolution zones), tunnels, mines and geologichazardsGravity anomalies can be modeled to estimate theextentofanomalous featuresNot significantly affected by utilities, concrete, andother surface features that may degrade othergeophysicaldataMeasurements made along survey lines or within asurvey grid to provide plan-view contour maps thatshowlateral trendsandguideconfirmatoryboringsMeasurements with modern gravimeters allow forproduction rates that are equal to other standardsurfacegeophysicalmethodsSurveyproceduresoutlined inASTMD6430-99-450 -400 -350 -300Station (ft)100806040200Depth(ft)-200 -150 -100 -50 0 50 100 150 200Distance (Feet)-50-40-30-20-100GravityAnomaly(uGals)Low-gravity trend dueto karst conduitEpikarst zone modeled frommicrogravity dataMicrogravity Profile