...Gang Yu; Zhidong Cai; Yuanzhong Chen; Ximing Wang; Qinghong Zhang; Yanpeng Li; Yanhua Wang; Congwei Liu; Baoyin Zhao; Joe Greer Abstract Distributed acoustic sensing (DAS) is a novel technology that uses an optical fiber cable as a sensor for acoustic signals and can take almost any downhole fiber...

...Han Xiao; Shane Zhang; Robb Moss; Zhongwen Zhan Abstract In light of the global shift toward deep‐water offshore wind projects, including recent leases off California’s central and northern coasts, this study leverages distributed acoustic sensing (DAS) technology on existing dark fiber‐optic...

...Xin Wang; Ethan F. Williams; Martin Karrenbach; Miguel González Herráez; Hugo Fidalgo Martins; Zhongwen Zhan Abstract The 2020 Rose Parade in Pasadena, California, was recorded by the Pasadena distributed acoustic sensing array, which utilizes the underground telecom fiber optic cables as sensors...

...Francesco Ciocca; Ivan Lunati; Nick Van de Giesen; Marc B. Parlange Abstract An Actively Heated Fiber Optics (AHFO) method to estimate soil moisture is tested and the analysis technique improved on. The measurements were performed in a lysimeter uniformly packed with loam soil with variable water...

...Joël Le Calvez; Erkan Ay Fiber-optic technology has revolutionized various fields, including telecommunications, medicine, and geophysics. One of the most promising advancements within fiber optics is distributed sensing, which enables the continuous measurement (versus space-limited point sensing...

... the potential to enhance subsurface imaging capabilities, especially at small scales. The technique of DAS enables the transformation of standard optical fibers into dense seismic arrays that continuously record deformation time series every few meters across tens‐of‐kilometers of fibers. Such measurements...

... , 1461 - 1472 . Bulletin of the Seismological Society of America, VoL 80, No. 1, pp, 218-225, February 1990 A FIBER OPTICAL BOREHOLE SEISMOMETER BY P. C. LEARY, D. V. MANOV, AND Y. G. LI Several technical problems prevent the most efficient seismometric use of deep borehole resources. Temperatures...

...John Blum; Heiner Igel; Mark Zumberge Abstract We present observations from a vertical, optical fiber interferometric strainmeter in the San Andreas Fault Observatory at Depth borehole near Parkfield, California. The sensor detects both teleseismic earthquakes and local events, along with coseismic...

... probe arrays installed permanently in a borehole are an alternative to moving probes and can be applied especially for temperature monitoring even under conditions where moving probes cannot be used. The distributed optical fiber sensing technique represents a new approach for temperature measurements...

... at the low‐noise underground laboratory Laboratoire Souterrain à Bas Bruit (LSBB, France). It is based on Fabry–Pérot optical interferometry between the extremity of a probing optical fiber and a reflecting mirror secured to the mobile mass of a passive 2 Hz geophone. The detection technique is based...

..., infrastructure failures, and so forth. Although seismic activity is typically measured using dedicated point sensors (e.g., geophones and accelerometers), techniques such as distributed acoustic sensing have demonstrated the utility of using fiber‐optic cable to detect seismic activity over comparable distances...

... injection and also informed the reservoir models. In 610 days of passive seismic monitoring of the Stage 3 injection, we detected 17 microseismic events (maximum moment magnitude M w 0.1) using five deep boreholes equipped with enhanced‐sensitivity optical fiber. The DAS array has sensitivity sufficient...

...R. Daniel Costley; Gustavo Galan-Comas; Clay K. Kirkendall; Janet E. Simms; Kent K. Hathaway; Michael W. Parker; Stephen A. Ketcham; Eric W. Smith; William R. Folks; Troy W. Milburn; Heidi M. Wadman ABSTRACT Experiments were performed comparing the response of fiber optic distributed acoustic...

...Ning Wu; Yuying Wang; Yue Li ABSTRACT Distributed fiber-optical acoustic sensing (DAS) is an emerging technology, which uses optical fiber as a sensor for signal acquisition and recently has been applied to seismic exploration. Seismic records collected with DAS equipment often are contaminated...