Print Email Facebook Twitter Impact of instrumental drift on the estimation of deformation parameters from an acoustic ranging network on the seabed above the Ormen Lange gas field Title Impact of instrumental drift on the estimation of deformation parameters from an acoustic ranging network on the seabed above the Ormen Lange gas field Author De Vries, R.V.F. Contributor Hanssen, R.F. (mentor) Faculty Civil Engineering and Geosciences Department Geoscience and Remote Sensing Programme Generic Date 2015-03-02 Abstract The observations from a sea-floor acoustic ranging network at Ormen Lange, west of the coast of Norway, are examined for parameters of deformation. The null hypothesis implies that no significant differences in strain rate of change exist between different areas in the network. A model of condition equations is implemented for the combined purpose of data snooping and an overall model test of the null hypothesis. Input for the model is formed by raw estimated strain rates and the estimated instrumental drift rates of sound velocity and travel-time for different parts of the network, with respect to a common reference measurement. The estimated instrumental drift rates show a spatial pattern which is in agreement with that of the estimated raw strain rates rates. An overall model test on the null hypothesis model yields accepts the hypothesis. It means that no significant differential strain can be estimated from the current data and processing method, and the raw observed differential strain is mainly influenced by instrumental drift of the sound velocity measurements. Subject deformation monitoringacoustic rangingseafloor deformation To reference this document use: http://resolver.tudelft.nl/uuid:7a78c8b9-ccb7-495b-8d9a-86c283c56c5f Embargo date 2025-03-02 Coordinates 63.50, 5.39 Part of collection Student theses Document type master thesis Rights (c) 2015 De de Vries, R.V.F.