Departmental Research Projects
Publication detailsZong, Y., Shennan, I., Combellick, R.A., Hamilton, S.L. & Rutherford, M.M. Microfossil evidence for land movements associated with the AD 1964 Alaska earthquake. The Holocene. 2003;13:7-20.
- Publication type: Journal Article
- ISSN/ISBN: 0959-6836, 1477-0911
- DOI: 10.1191/0959683603hl590rp
- Keywords: Diatom, Pollen, Earthquake, 1964, Pre-Seismic, Land Subsidence, Alaska.
- Further publication details on publisher web site
- Durham Research Online (DRO) - may include full text
Author(s) from Durham
Microfossil diatom and pollen data from a number of cores at coastal marshes at Girdwood Flats and Kenai Flats in Cook Inlet, Alaska, suggest that there was a phase of gradual land subsidence prior to the main shock of the AD 1964 earthquake. This phase followed a long period of gradual land uplift since the last large earthquake, which occurred about 730-900 years ago. Caesium (137Cs) records indicate that subsidence started approximately 15 years before the 1964 earthquake. This pre-seismic subsidence is evident in the coastal marsh sediment sequences in changes in diatom and pollen assemblages that indicate changes in tidal-marsh environments or a change from raised-bog to marsh conditions. The microfossil evidence indicates ~0.15 m pre-seismic land subsidence at both Girdwood Flats and Kenai Flats and co-seismic subsidence of ~1.8 m and ~0.2 m respectively.
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