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Performance of Raspberry Shake vs. Kentucky Seismic and Strong-Motion Network Instruments

Description: 

Kentucky is affected by three seismic zones: the New Madrid (NMSZ), Wabash Valley, and Eastern Tennessee Seismic Zones. The NMSZ is of particular interest as it previously hosted several large earthquakes >7.0 M in 1811-1812 and maintains the highest seismicity rate in the Central and Eastern U.S. This heightened risk of strong shaking has motivated improvements in detection capabilities of regional seismic networks for possible implementation of earthquake early warning (EEW) systems. EEW detection capabilities can be improved by upgrading existing seismic stations with more sensitive instrumentation, or by densifying the backbone regional network with lower cost sensors like Raspberry Shake (RS) devices. Here we tested the performance of RS geophones and accelerometers by collocating five RS-3D and one RS-4D at five Kentucky Seismic and Strong-Motion Network (KSSMN) permanent stations and monitoring seismicity. During this two-year deployment, 25 usable earthquakes (magnitude ≥ 2.5) were recorded. Our comparisons were based on peak ground velocity (PGV), duration of strong shaking, Arias intensity values, as well as waveform and spectral amplitudes of the RS devices relative to the KSSMN instruments. Preliminary results indicate that the PGV and shaking-duration of small magnitude events are very comparable between RS and KSSMN instruments. Waveforms and spectral amplitudes also match well between RS and KSSMN instruments, specifically where RS and KSSMN instruments were installed within the same vault. Other sites where the RS was located 2-5 m away from the permanent KSSMN instrument exhibited slightly lower spectral amplitudes than KSSMN instruments. This shift may be related to unaccounted-for responses of the RS geophones, the installation locations of the RS relative to the permanent KSSMN instruments, or a combination of both. Because the ground-motions captured were all weak-motion, the instrument self-noise of the RS-4D's MEMS strong-motion accelerometer channels prevented directly comparing its performance.

Session: Network Seismology: Recent Developments, Challenges and Lessons Learned [Poster Session]

Type: Poster

Date: 5/1/2024

Presentation Time: 08:00 AM (local time)

Presenting Author: Seth

Student Presenter: No

Invited Presentation: 

Authors