FN Archimer Export Format
PT J
TI Onland and Offshore Extrinsic Fabry–Pérot Optical Seismometer at the End of a Long Fiber
BT 
AF Bernard, Pascal
   Feron, Romain
   Plantier, Guy
   Nercessian, Alexandre
   Couteau, Julien
   Sourice, Anthony
   Feuilloy, Mathieu
   Cattoen, Michel
   Seat, Han‐Cheng
   Chawah, Patrick
   Chéry, Jean
   Brunet, Christophe
   Boudin, Frédérick
   Boyer, Daniel
   Gaffet, Stéphane
   Geli, Louis
   Pelleau, Pascal
AS 1:1;2:2,3;3:2,3;4:1;5:1;6:2,3;7:2,3;8:4;9:4;10:5;11:5;12:1;13:6;14:7;15:7;16:8;17:8;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;11:;12:;13:;14:;15:;16:PDG-REM-GM-LAD;17:PDG-REM-GM-CTDI;
C1 IPGP, Université de Paris, UMR 7154 CNRS, 1 rue Jussieu, 75005 Paris, France
   ESEO Group, 10 Boulevard Jean Jeanneteau, 49100 Angers, France
   Also at LAUM, Université du Maine, Avenue Olivier Messiaen, 72085 Le Mans, France.
   LAAS‐CNRS, 7 Avenue du Colonel Roche, 31400 Toulouse, France
   Géosciences Montpellier, Place Eugène Bataillon, 34090 Montpellier, France
   Département de Géologie, ENS Paris, 24 Rue Lhomond, 75005 Paris, France
   Laboratoire Souterrain à Bas Bruit (LSBB), 84400 Rustrel, France
   IFREMER, 1625 Route de Sainte‐Anne, 29280 Plouzané, France
C2 IPGP, FRANCE
   ESEO GROUP, FRANCE
   UNIV LE MANS, FRANCE
   CNRS, FRANCE
   UNIV MONTPELLIER, FRANCE
   ENS, FRANCE
   LSBB, FRANCE
   IFREMER, FRANCE
SI BREST
SE PDG-REM-GM-LAD
   PDG-REM-GM-CTDI
IN WOS Ifremer UPR
   copubli-france
   copubli-univ-france
IF 3.131
TC 8
UR https://archimer.ifremer.fr/doc/00585/69743/70207.pdf
LA English
DT Article
AB We report here the design, performance, and in situ demonstration, on‐land and offshore, of an innovative high‐resolution low‐cost optical (laser) seismometer. The instrument was developed within the Laser Interferometry for Earth Strain project (French Agence Nationale de la Recherche [ANR] program), and first tested 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 on the wavelength modulation of the laser diode (1310 nm), which allows the separation of the optical power into two signals in quadrature, thanks to an heterodyne technique. The relative displacement of the mobile mass is retrieved in real time by the phase unwrapping of these two signals. At LSBB, the fiber was 3 km long. It recorded many teleseismic earthquakes and a few regional ones, and resolves the low‐seismic noise of the Earth for periods up to 6 s, presenting an acceleration noise floor lower than 1  ng/Hz−−−√ in the 0.3–5 Hz range. A three‐component version of this fiber‐based interferometric 2 Hz geophone has been recently constructed, shielded in a hyperbaric container, and installed offshore for test in Brittany (France) in April 2018, with an improved control system. Its record of the marine ambient noise matches those of a collocated commercial broadband seismometer for periods up to 50 s. This opens promising perspectives for large‐scale ocean bottom instrumentation with up to 50‐kilometer‐long optical lines; an installation is planned for 2020, off Guadeloupe, with a 5‐kilometer‐long fiber cable. It may also prove useful for installations in other challenging and exposed environments, such as deep hot boreholes, active volcanoes, unstable landslides, for real‐time monitoring in regions with high natural hazard, but also for seismic monitoring of geoindustries. 
PY 2019
PD NOV
SO Seismological Research Letters
SN 0895-0695
PU Seismological Society of America (SSA)
VL 90
IS 6
UT 000493295100010
BP 2205
EP 2216
DI 10.1785/0220190049
ID 69743
ER

EF