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Epicenter localization using forward-transmission laser interferometry.

Bohan Zhang, Guan Wang, Zhongwang Pang

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    Summary
    This summary is machine-generated.

    This study introduces an integral response method using optical fibers and laser interferometry for precise earthquake epicenter localization. The technique accurately determines seismic wave speed, depth, and distance, even in noisy conditions.

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    Area of Science:

    • Geophysics and seismology
    • Optical physics and sensing

    Background:

    • Distributed optical fiber sensing offers novel approaches to seismic detection.
    • Phase-sensitive laser interferometry enhances the precision of seismic measurements.
    • Accurate epicenter localization is crucial for earthquake response and research.

    Purpose of the Study:

    • To propose and validate an integral response method for seismic epicenter localization using optical fibers.
    • To leverage forward transmission schemes for enhanced seismic data analysis.
    • To determine the feasibility of precise epicenter parameter estimation (direction, depth, distance, wave speed).

    Main Methods:

    • Development of an integral response method based on a forward transmission scheme.
    • Utilizing spectrum analysis and parameter fitting for epicenter localization.
    • Analyzing integral phase changes of light in forward and reverse directions within a fiber ring.

    Main Results:

    • The proposed method accurately determines epicenter direction, depth, distance, and seismic wave speed.
    • Simulations with a signal-to-noise ratio of 20 dB at 200 km epicenter distance yielded high precision.
    • Achieved errors include ~0.003° for orientation angle, ~0.9 m/s for P-wave speed, ~9.5 m for depth, and ~200 m for distance.

    Conclusions:

    • The integral response method demonstrates significant potential for expanding seismic detection capabilities.
    • Optical fiber sensing combined with phase-sensitive laser interferometry provides ultrahigh precision in epicenter localization.
    • This technique offers a promising advancement for real-time seismic monitoring and analysis.