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Related Experiment Video

Updated: May 16, 2025

A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response

A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response

Published on: January 7, 2019

Urban sensing using existing fiber-optic networks.

Jingxiao Liu¹, Haipeng Li², Hae Young Noh³

¹Senseable City Laboratory, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA. jingxiao@mit.edu.

Nature Communications

|March 31, 2025

Summary

This summary is machine-generated.

Researchers used existing fiber optic cables as a seismic sensor network to pinpoint urban earthquake sources. This novel method maps seismic source power (SSP) across cities, revealing insights into urban activity and noise.

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Last Updated: May 16, 2025

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Area of Science:

Geophysics
Urban Seismology
Distributed Acoustic Sensing

Background:

Urban seismic signal analysis provides insights into urban environments and society.
Conventional seismographic networks struggle with city-wide seismic source detection due to high costs of ultra-dense arrays for high-frequency anthropogenic sources.

Purpose of the Study:

To leverage existing fiber-optic networks as a distributed acoustic sensing system for accurate urban seismic source localization.
To estimate the temporal variation of seismic source intensity in urban areas.
To generate spatiotemporal maps of seismic source power (SSP) across a city.

Main Methods:

Repurposing a 50-kilometer telecommunication fiber into an ultra-dense seismic array.
Utilizing distributed acoustic sensing (DAS) technology to detect and locate seismic sources.
Generating spatiotemporal maps of seismic source power (SSP).

Main Results:

Accurate localization of urban seismic sources, including traffic, construction, and school activities.
Successful generation of spatiotemporal seismic source power (SSP) maps across San Jose, California.
Demonstrated strong correlations between SSP values and environmental noise, land use patterns, and demographics.

Conclusions:

Repurposing fiber-optic networks as DAS systems overcomes limitations of traditional seismology for urban sensing.
This approach enables accurate localization of remote seismic sources from urban activities.
SSP mapping correlates with urban characteristics, offering a new tool for urban environmental monitoring.