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Recent Improvements in Very Broadband Seismometer Self-noise Performance Embodied in the New Trillium 360 GSN Instruments

Nanometrics new Trillium 360 GSN seismometer embodies the culmination of many years of research and technology innovation as well as extensive collaboration with and input from the scientific community interested in very broadband seismometry. Several generations of seismometers with 240 or 360 second corner frequency have demonstrated successive improvements in self-noise at both very low and high frequencies. The most recent development has produced the lowest self-noise of any vault seismometer and is the only seismometer currently being manufactured that meets the performance requirements of a primary seismometer for the Global Seismographic Network.

Posthole, Borehole and Vault form factors are available and being manufactured and delivered to the GSN. Performance testing of several units of each model type has been carried out at the facilities of GSN participating member institutions. The results of the performance testing are reviewed and interpreted and compared with other co-located instrument types including the venerable STS-1.

Field deployment is now proceeding, to upgrade the GSN network with the Trillium 360 GSN seismometer. We will show results from new deployments as available at the time of the 2022 SSA conference. We will also present the Trillium 360 roadmap, with a smaller low-power version for ocean bottom and portable land deployments in development for 2022 and early test results as available.

Session: Advances in Geophysical Sensing [Poster]

Type: Poster

Room: Evergreen Ballroom

Date: 4/20/2022

Presentation Time: 08:00 AM Pacific

Presenting Author: Geoffrey Bainbridge

Student Presenter: No

Additional Authors