期刊
HOLOCENE
卷 13, 期 1, 页码 7-20出版社
ARNOLD, HODDER HEADLINE PLC
DOI: 10.1191/0959683603hl590rp
关键词
diatom; pollen; earthquake; 1964; pre-seismic; land subsidence; Alaska
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 (Cs-137) 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 similar to0.15 m pre-seismic land subsidence at both Girdwood Flats and Kenai Flats and co-seismic subsidence of similar to1.8 m and similar to0.2 m respectively.
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