Gravity reduction spreadsheet to calculate the Bouguer anomaly using standardized methods and constants

Current standards for reduction of observed gravity to a modeled Bouguer anomaly largely are unregulated and vary among geophysical textbooks, commercial software programs, and academic research spreadsheets available for download from the Internet. Using new standards established by the U. S. Geological Survey ( USGS) and the North American Gravity Database Committee, we developed a spreadsheet for reduction of raw data to the Bouguer anomaly and, with the use of terrain correction, the complete Bouguer anomaly. The spreadsheet is available for free download from the Geological Society of America Data Repository. We view the spreadsheet as particularly useful for field data reduction and modeling where Internet access is limited or unavailable.