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Evolution of EEW Instrumentation

Session: Earthquake Early Warning System in the Americas: The On-Going Effort and the State of the Art [Poster]

Type: Poster

Date: 4/20/2021

Presentation Time: 11:30 AM Pacific

Description: 

Nanometrics has responded to EEW program requirements with innovative instrument developments, specifically a wide dynamic range instrument, the Cascadia, combining strong and weak motion sensors in a single case. This instrument has a very large dynamic range, 200dB, wide bandwidth and low noise floor with a configurable clip level. The sensors are packaged in a robust case that can be deployed in shallow direct burial deployments used in aftershock studies or in state-of-the-art boreholes used for combined EEW monitoring sites/regional arrays and scientific studies. We have released a new version of the Cascadia, the Cascadia Slim with a lower noise floor at the long period frequencies based on the Trillium T120 Slim broadband sensor. The Cascadia Slim has a wide dynamic range, 215dB, in a similar environmental package and will improve the magnitude of completeness (Mc) of a seismic network where it was limited by broadband sensor performance and in most EEW networks will only be limited by the site noise and emplacement techniques. Using this new instrument the economy and confidence of station performance in a network can be measurably improved and enables new station installs to be lower cost and with better emplacement technologies through use of properly built and deeper cased holes.

Presenting Author: Tim Parker

Student Presenter: No

Authors