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

Seismological Research Letters

By:
ORCID iD , ORCID iD , , ORCID iD , and ORCID iD
https://doi.org/10.1785/0220170236

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Abstract

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 .

Additional publication details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Laboratory tests of three Z‐Land Fairfield Nodal 5‐Hz, three‐component sensors
Series title:
Seismological Research Letters
DOI:
10.1785/0220170236
Edition:
Online First
Year Published:
2018
Language:
English
Publisher:
Seismological Society of America
Contributing office(s):
Geologic Hazards Science Center