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Session: Earthquake Characterization Using Fiber-optic Cables [Poster]

Type: Poster

Date: 10/7/2024

Time: 05:00 PM

Room: Stanley Park Ballroom

Construction of Horizontal Strain Array from DAS Sensor

DAS (Distributed Acoustic Sensing) technology provides an economical way to deploy thousands of linear strain meters along the fiber cable. To fully utilize the information of the strain field, at least three linear strain meters are needed at the same site to obtain a horizontal strain tensor. Taking the opportunity by the redeployment of the surface fiber cable of the MiDAS (Milun fault Drilling and All-inclusive Sensing project) at the end of 2022, three components of fiber cable oriented at 0-45-90 degrees with cable length of 20 meters each were deployed on the surface. This allows us to compute the full strain tensor from the three arms of the fiber cable, rotating the surface strains into a radial-transverse coordinate system. Together with a collocated 3-axis seismometer and 3-axis rotation sensor, 10 components of the elastic wavefield can be achieved. In this study we merge the strain, rotation, and seismometer measurements at the same station and investigate if we could determine the direction of wave propagation and phase velocity for specific wave type from the combination of these measurements.

Presenting Author: Chin-Jen

Additional Authors