FN Archimer Export Format
PT J
TI Orienting and locating ocean-bottom seismometers from ship noise analysis
BT 
AF Trabattoni, A
   Barruol, G
   Dreo, R
   Boudraa, A O
   Fontaine, F R
AS 1:1;2:1;3:2;4:2;5:1,3;
FF 1:;2:;3:;4:;5:;
C1 Université de Paris, Institut de physique du globe de Paris, CNRS, F-75005 Paris, France
   Ecole Navale IRENav/Arts & Métiers ParisTech, BCRM Brest, CC 600, 29240 Brest, France
   Université de La Réunion, Laboratoire GéoSciences Réunion, F-97744 Saint Denis, France
C2 UNIV PARIS, FRANCE
   IRENAV, FRANCE
   UNIV LA REUNION, FRANCE
IF 1.544
TC 10
UR https://archimer.ifremer.fr/doc/00593/70463/68591.pdf
LA English
DT Article
CR MD 192 / RHUM-RUM
BO Marion Dufresne
DE ;Statistical methods;Time-series analysis;Body waves;Seismic instruments;Seismic noise;Wave propagation
AB Breakthroughs in understanding the structure and dynamics of our planet will strongly depend upon instrumenting deep oceans. Progress has been made these last decades in ocean-bottom seismic observations, but ocean-bottom seismometer (OBS) temporary deployments are still challenging and face set-up limitations. Launched from oceanographic vessels, OBSs fall freely and may slightly drift laterally, dragged by currents. Therefore, their actual orientation and location on the landing sites are hard to assess precisely. Numerous techniques have been developed to retrieve this key information, but most of them are costly, time-consuming or inaccurate. In this work, we show how ship noise can be used as an acoustic source of opportunity to retrieve both the orientation and the location of OBSs on the ocean floor. To retrieve the OBS orientation, we developed a first method based on a combination of seismic and pressure data through the use of the acoustic intensity. This latter can be used to quantify the OBS orientation from the ship noise direction of arrival (DOA), which can then be compared with known ship trajectories obtained from the automatic identification system (AIS). To accurately relocate OBSs, we also developed a second method based on the hydrophone data which computes distances of acoustical sources by measuring time differences of arrival (TDOA) between direct and reverberated phases. The OBS location is then retrieved by fitting measured ship distances with known ship trajectories. In this study, a full network of OBSs deployed in the SW Indian Ocean was reoriented and a test station was relocated. We demonstrate that our new methods may quantify the OBS orientation with an accuracy of about one degree, and its location with an accuracy of a few tens of metres, depending on the number of ships used in the analysis. 
PY 2020
PD MAR
SO Geophysical Journal International
SN 0956-540X
PU Oxford University Press (OUP)
VL 220
IS 3
UT 000525944600023
BP 1774
EP 1790
DI 10.1093/gji/ggz519
ID 70463
ER

EF