Accurate Ocean Bottom Seismometer Positioning Method Inspired by Multilateration Technique |
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| Authors: | Omar Benazzouz Luis M Pinheiro Luis M A Matias Alexandra Afilhado Daniel Herold Seth S Haines |
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| Institution: | 1.Department of Geosciences,University of Aveiro,Aveiro,Portugal;2.Instituto Dom Luiz, Faculdade de Ciências,Universidade de Lisboa,Lisbon,Portugal;3.Instituto Superior de Engenharia de Lisboa, Instituto Politecnico de Lisboa,Lisbon,Portugal;4.Parallel Geoscience Corporation,Crystal Bay,USA;5.Central Energy Resources Science Center,United States Geological Survey,Denver,USA |
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| Abstract: | The positioning of ocean bottom seismometers (OBS) is a key step in the processing flow of OBS data, especially in the case of self popup types of OBS instruments. The use of first arrivals from airgun shots, rather than relying on the acoustic transponders mounted in the OBS, is becoming a trend and generally leads to more accurate positioning due to the statistics from a large number of shots. In this paper, a linearization of the OBS positioning problem via the multilateration technique is discussed. The discussed linear solution solves jointly for the average water layer velocity and the OBS position using only shot locations and first arrival times as input data. |
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