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Laboratory tests of three Z‐Land Fairfield Nodal 5‐Hz, three‐component sensors

June 19, 2018

We conduct a number of laboratory tests at the Albuquerque Seismological Laboratory to verify the self‐noise and fidelity in which 3 three‐component Fairfield Nodal Z‐Land, Generation 2, 5‐Hz sensors are able to record seismic signals. In addition to the incoherent self‐noise of the sensors, we estimate the sensitivity of the units in digital volts/m/s, the damping, and the free period. These three parameters allow us to completely characterize the response of the instruments. We find that the responses of all components match a mean‐derived response to within 5% of amplitude and 0.03 radians in phase. This close agreement suggests that for most applications a nominal response is suitable. We also checked the timing of the units as compared to a Quanterra Q330HR and found good agreement up to 200samples/s . Finally, we compared the results of our noise tests on these sensors to a couple of nodal sensors recently deployed at the Community Wavefield Demonstration Experiment in north‐central Oklahoma and found that local site noise and not the sensor self‐noise is a fundamental limiter in the resolution of these deployed sensors at frequencies above ∼0.1Hz .

Publication Year 2018
Title Laboratory tests of three Z‐Land Fairfield Nodal 5‐Hz, three‐component sensors
DOI 10.1785/0220170236
Authors Adam T. Ringler, Robert E. Anthony, M.S Karplus, Austin Holland, David C. Wilson
Publication Type Article
Publication Subtype Journal Article
Series Title Seismological Research Letters
Index ID 70197758
Record Source USGS Publications Warehouse
USGS Organization Geologic Hazards Science Center