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This report summarizes results of two airborne geophysical surveys conducted in the upper San Pedro Valley of southeastern Arizona in 1997 and 1999. The combined surveys cover about 1,000 square kilometers and extend from the Huachuca Mountains on the west to the Mule Mountains and Tombstone Hills on the east, and from north of the Babocomari River to near the Mexican border on the south. Part of the survey included acquisition of high-resolution magnetic data, which were used to map depth to the crystalline basement rocks underlying the sediments filling the basin. The magnetic inversion results show a complex basement morphology, with sediment thickness in the center ranging from ~ 237 meters beneath the city of Sierra Vista to -1,500 meters beneath Huachuca City and the Palominas area near the border. Another part of the survey included acquisition of 120-channel time-domain electromagnetic data. Extensive QA/QC analysis of these data, including inversion to conductivity-vs-depth (conductivity-depth-transform or CDT) profiles and comparisons with electrical well-logs, show that this electrical conductor maps the underlying water over most of the basin. In a few places (notably the mouth of Huachuca Canyon) the reported water table lies above where the electrical

u.s. geological survey open file report/open-file report

Mapping groundwater in three dimensions: An analysis of the airborne geophysical surveys of the upper San Pedro River basin, Cochise County, southeastern Arizona with an interpretation of where the groundwater lies