Tomographic inversion of ocean bottom seismograph (OBS) data: Problems and solutions applied to the NW Svalbard Hydratech data set

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• 作者：Giuliana  ; Rossi  ; ;   ; ^{grossi@inogs.it} ; Gualtiero  ; Bö ; hm ; Gianni  ; Madrussani
• 关键词：Tomography ; OBS ; Datuming ; Irregular adaptive gridding ; Reflector geometry
• 刊名：Computers & Geosciences
• 出版年：2011
• 出版时间：October 2011
• 年：2011
• 卷：37
• 期：10
• 页码：1535-1544
• 全文大小：1789 K
• ISSN：S009830041000333X

文摘

The paper is aimed at discussing some problems that may arise in the tomographic inversion of data acquired with particular geometries, as vertical seismic profiles (VSP) or implying the use of Ocean Bottom Seismographs (OBS), and presenting the solutions used to solve them. One problem is due to the limited number of sensors (that may be even a single one) and of their sparseness. This affects the information distribution that is concentrated in the vicinity of each sensor. This fact, together with the second problem, i.e. the strong asymmetry of the ray path, may decrease the reliability of the inversion.

Two procedures for irregular adaptive gridding of the reflecting interfaces and single ray datuming are proposed as possible solutions to overcome these obstacles, while obtaining a reliable and highly resolved velocity model in depth: the relative procedures are tested through synthetic models and on real data.