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Gravity surveys using a mobile atom interferometer

September 6, 2019

Mobile gravimetry is important in metrology, navigation, geodesy, and geophysics. Atomic gravimeters could be among the most accurate mobile gravimeters, but are currently constrained by being complex and fragile. Here, we demonstrate a mobile atomic gravimeter, measuring tidal gravity variations in the laboratory as well as surveying gravity in the field. The tidal gravity measurements achieve a sensitivity of 37 μGal/√Hz (1 μGal=10 nm/s2) and a long-term stability of better than 2 μGal, revealing ocean tidal loading effects and recording several distant earthquakes. We survey gravity in the Berkeley Hills with an uncertainty of around 0.04 mGal and determine the density of the subsurface rocks from the vertical gravity gradient. With simplicity and sensitivity, our instrument paves the way for bringing atomic gravimeters to field applications.

Citation Information

Publication Year 2019
Title Gravity surveys using a mobile atom interferometer
DOI 10.1126/sciadv.aax0800
Authors Xuejian Wu, Zachary Pagel, Bola S. Malek, Timothy H. Nguyen, Fei Zi, Daniel Scheirer, Holger Muller
Publication Type Article
Publication Subtype Journal Article
Series Title Science Advances
Index ID 70205278
Record Source USGS Publications Warehouse
USGS Organization Geology, Minerals, Energy, and Geophysics Science Center