A distributed, coaxial-cable-based strainmeter for onshore and seafloor geodesy Abstract

abstract

  • Geodetic measurements provide critical observations of surface deformation related to a wide range of geophysical problems, including earthquakes, volcanoes, landslides, and glaciers. However, the main current geodetic technologies, GPS, InSAR, borehole and laser strainmeters, have their limitations. Inexpensive geodetic instrument that combines high strain resolution, high dynamic range to survive large deformation, high spatial/ temporal resolution, and offshore capability is still lacking. To solve this problem, we are developing a distributed strainmeter based on novel distributed coaxial cable Bragg grating (CCBG) sensing technology that operates both on land and offshore and provides, at a moderate cost, high accuracy (micro-strain) and high temporal resolution (~ sec) measurements with an unprecedentedly high spatial (~10 m) resolution over 10s of km length. Compared to fiber optic sensing, the CCBG technology can survive large deformation, providing critical information during and after earthquakes, landslides, and other large deformation events. By increasing spatial and/or temporal sampling of ground deformation by orders of magnitude, the new instrument complements current geodetic technologies and has the potential of greatly advancing geodetic observations.

authors

publication date

  • 2014

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