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 monitoring
acoustic ranging
seafloor 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.