Wellington tide gauge, Queen's Wharf geological stability assessment

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Perrin, N.D. 2001 Wellington tide gauge, Queen's Wharf geological stability assessment . Lower Hutt: Institute of Geological & Nuclear Sciences. Institute of Geological & Nuclear Sciences science report 2001/08 28 p.

Abstract: The reliability of long-term sea-level records are dependent on the stability of the tide gauge and the benchmarks used in conjunction with it. Subsidence of the gauge or benchmarks can occur as a result of tectonic deformation, compaction of reclamation fill, compaction of recent sediments beneath reclamation filling, or loadings from buildings. Compaction may also be caused by earthquake shaking or pile-driving. The continuity and reliability of measurements can also be affected by relocation of the gauge, loss or replacement of reference benchmarks. Despite these possible causes of errors, the Wellington tide gauge at Queen's Wharf has provided a continuous record since 1887, and it is accepted that deformation due to settlement of reclamation fill has been insignificant at least since 1911. However, minor anomalies in recorded levels may be able to be accounted for by earthquakes and the history of filling and construction in the area. Earthquakes giving felt intensities greater than MM VI at the site since 1887 have been tabulated, along with dates of pile-driving and reclamations close to the gauge and benchmark sites. (auth)