Earthquake observatory with coherent laser interferometry on the telecom fiber network
arxiv(2023)
摘要
Laser interferometry enables to remotely measure microscopical length changes
of deployed telecommunication cables originating from earthquakes. Long range
and compatibility with data traffic make it unique to the exploration of remote
regions, as well as highly-populated areas where optical networks are
pervasive, and its large-scale implementation is attractive for both Earth
scientists and telecom operators. However, validation and modeling of its
response and sensitivity are still at an early stage and suffer from lack of
statistically-significant event catalogs and limited availability of co-located
seismometers. We implemented laser interferometry on a land-based
telecommunication cable and analyzed 1.5 years of continuous acquisition, with
successful detections of events in a broad range of magnitudes, including very
weak ones. By comparing fiber and seismometer recordings we determined
relations between a cable's detection probability and the magnitude and
distance of events, and showed that spectral analysis of recorded data allows
considerations on the earthquake dynamics. Our results reveal that quantitative
analysis is possible for this sensing technique and support the interpretation
of data from the growing amount of interferometric deployments. We anticipate
the high integration and scalability of laser interferometry into existing
telecommunication grids to be useful for the daily seismicity monitoring, in
perspective exploitable for civilian protection use.
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