Understanding Fiber Response With Lab-Scale Tests and Modeling
Session: Fiber-Optic Seismology I [Poster]
Type: Poster
Date: 4/23/2021
Presentation Time: 11:30 AM Pacific
Description:
Understanding the exact nature of the fiber coupling to seismic waves in a variety of settings is key to quantitative interpretation and modeling of seismic data. Using a small-scale (~20 cm by 30 cm) laboratory setup, we measure the exact strain response of a fiber to a known source. The source is a small metal ball on a pendulum that impacts the side of the testbed. The fiber is embedded in dry sand. The strain in the fiber is measured using a high SNR interferometric approach and represents total strain rather than a distributed measurement. The signal is also measured by a co-located geophone in the testbed. Tests of repeatability show that the source is highly repeatable and that the geophone signal (velocity) is consistent with the measured strain. Initial 3D finite difference models demonstrate a reasonable fit to the data. We plan to test other materials such as partially and fully saturated sand and conduct modelling in parallel.
Presenting Author: Peter J. Thomas
Student Presenter: No
Authors
Peter Thomas Presenting Author Corresponding Author peth@norceresearch.no NORCE Norwegian Research Centre |
Bob Paap bob.paap@tno.nl TNO, Applied Geosciences |
Yngve Heggelund ynhe@norceresearch.no NORCE Norwegian Research Centre |
Antony Butcher antony.butcher@bristol.ac.uk University of Bristol |
Arben Pitarka pitarka1@llnl.gov Lawrence Livermore National University |
Eric Matzel matzel1@llnl.gov Lawrence Livermore National Laboratory |
Robert Mellors rmellors@ucsd.edu University of California, San Diego |
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Understanding Fiber Response With Lab-Scale Tests and Modeling
Category
Fiber-optic Seismology