Field Evaluation of Seismic Sensors for Monitoring Earthquakes, Tsunamis, Volcanoes, and Geodesy
Description:
Real-time seismic and geodetic networks increase the resilience of societies by monitoring geophysical hazards and providing high-quality data for underlying scientific studies. Traditional broadband seismometers and tiltmeters do not have the range to measure strong seismic events, and traditional strong motion sensors lack the sensitivity or stability to make good long-term geodetic measurements. There is a need for improved, high-resolution measurements of earthquake shaking, tilts, Earth tides, slow-slip events, and geodesy over a time spectrum spanning fractions of a second to years. Three fundamental science requirements to measure geohazards and geodesy for both onshore and offshore sites are:
·Low noise floor
·Long-term stability
·Wide dynamic range (no clipping and omni-directionality)
We tested seismic and tilt sensors in a moderately quiet vault near Hanford, Washington. We present analyses of sensor performance including noise floor, short-term examples of local and distant earthquakes, measurements of Earth tides, and long-term stability for slow slip events and geodesy. The sensors represent different technologies, including: (1) resonant quartz crystal - Quartz Seismic Sensors, (2) optical interferometric - Silicon Audio, and (3) conventional broadband – Nanometrics Trillium 120PA. Data are openly available from the EarthScope DMC archive. Initial results showed that the quartz accelerometers and tiltmeters met the most important noise floor requirements at longer periods (>5s) and their observations of Earth tides were higher fidelity (better signal to noise) than the broadband seismometer. The quartz sensors can also make long-term measurements of geodesy that are only limited by instrument drift. The optical interferometric accelerometers performed well at higher frequencies, but they are not omni-directional, and their design precludes long-term geodetic measurements.
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: Paul
Student Presenter: No
Invited Presentation:
Authors
Paul Bodin Presenting Author Corresponding Author bodin@uw.edu University of Washington |
Krishna Venkateswara krishna@paroscientific.com Paroscientific, Inc. & Quartz Seismic Sensors, Inc. |
William Wilcock wilcock@uw.edu University of Washington |
Harold Tobin htobin@uw.edu University of Washington |
Jerome Paros paros@paroscientific.com Paroscientific, Inc. & Quartz Seismic Sensors, Inc., |
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Field Evaluation of Seismic Sensors for Monitoring Earthquakes, Tsunamis, Volcanoes, and Geodesy
Category
Network Seismology: Recent Developments, Challenges and Lessons Learned