Siyuan Yuan

All Publications

• City-Scale Dark Fiber DAS Measurements of Infrastructure Use During the COVID-19 Pandemic. Geophysical research letters Lindsey, N. J., Yuan, S. n., Lellouch, A. n., Gualtieri, L. n., Lecocq, T. n., Biondi, B. n. 2020; 47 (16): e2020GL089931

  Abstract

  Throughout the recent COVID-19 pandemic, real-time measurements about shifting use of roads, hospitals, grocery stores, and other public infrastructure became vital for government decision makers. Mobile phone locations are increasingly assimilated for this purpose, but an alternative, unexplored, natively anonymous, absolute method would be to use geophysical sensing to directly measure public infrastructure usage. In this paper, we demonstrate how fiber-optic distributed acoustic sensing (DAS) connected to a telecommunication cable beneath Palo Alto, CA, successfully monitored traffic over a 2-month period, including major reductions associated with COVID-19 response. Continuous DAS recordings of over 450,000 individual vehicles were analyzed using an automatic template-matching detection algorithm based on roadbed strain. In one commuter sector, we found a 50% decrease in vehicles immediately following the order, but near Stanford Hospital, the traffic persisted. The DAS measurements correlate with mobile phone locations and urban seismic noise levels, suggesting geophysics would complement future digital city sensing systems.

  View details for DOI 10.1029/2020GL089931

  View details for PubMedID 32834188

  View details for PubMedCentralID PMC7435531

• Velocity-Based Earthquake Detection Using Downhole Distributed Acoustic Sensing-Examples from the San Andreas Fault Observatory at Depth BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA Lellouch, A., Yuan, S., Ellsworth, W. L., Biondi, B. 2019; 109 (6): 2491–2500

  View details for DOI 10.1785/0120190176

  View details for Web of Science ID 000499983200024