Holocene sea-level change and hydro-isostasy along the west coast of Kyushu, Japan

Yusuke Yokoyama, Masao Nakada, Yasuo Maeda, Shinji Nagaoka, Jun'ichi Okuno, Eiji Matsumoto, Hiroshi Sato, Yoshiaki Matsushima

Research output: Contribution to journalArticle

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Abstract

Mid- to late-Holocene sea-level variations have been obtained at sites along the west coast of Kyushu, Japan. Sea-level observations for this relatively stable area are very important for evaluating the crustal tilting associated with the hydro-isostatic adjustment due to the last deglaciation, and for examining the cause of underwater Jomon sites (submerged archeological sites during the Jomon period of mid-Holocene) typically observed in this region. For these purposes, we conducted systematic boring samplings at sites from Goto Island to Tamana along the latitude of about 33°N. Then we performed diatom assemblage and pyrite-sulfur analyses of these sediment samples and 14C datings for intertidal shells in order to get the sea-level variations for these sites. Observations at Tsumizu faced to Oomura Bay with tidal range of 0.9 m show a sea-level high- stand of 1 m at about 5500 yr B.P. (years before present) followed by smoothly falling to the present level. Evidences for sea-level oscillation of greater than 50 cm have not been found here. Relative sea-levels at about 5000 yr B.P. are, however, -2 m at Goto Island (125 km west of Tsumizu) and 2 m at Tamana (50 km east of Tsumizu). Thus observations at sites along the traverse from Goto Island to Tamana are indicative of crustal tilting of about ~3- 4 m for the distance of 175 kin, which seems to be consistent with the prediction caused by the hydro-isostatic adjustment.

Original languageEnglish
Pages (from-to)29-47
Number of pages19
JournalPalaeogeography, Palaeoclimatology, Palaeoecology
Volume123
Issue number1-4
DOIs
Publication statusPublished - Jul 1996

Fingerprint

isostasy
sea level change
sea level
Holocene
Japan
coasts
coast
last deglaciation
tidal range
Bacillariophyceae
boring
oscillation
pyrite
sulfur
diatom
shell
sampling
sediments
prediction
sediment

All Science Journal Classification (ASJC) codes

  • Oceanography
  • Ecology, Evolution, Behavior and Systematics
  • Earth-Surface Processes
  • Palaeontology

Cite this

Yokoyama, Y., Nakada, M., Maeda, Y., Nagaoka, S., Okuno, J., Matsumoto, E., ... Matsushima, Y. (1996). Holocene sea-level change and hydro-isostasy along the west coast of Kyushu, Japan. Palaeogeography, Palaeoclimatology, Palaeoecology, 123(1-4), 29-47. https://doi.org/10.1016/0031-0182(95)00112-3

Holocene sea-level change and hydro-isostasy along the west coast of Kyushu, Japan. / Yokoyama, Yusuke; Nakada, Masao; Maeda, Yasuo; Nagaoka, Shinji; Okuno, Jun'ichi; Matsumoto, Eiji; Sato, Hiroshi; Matsushima, Yoshiaki.

In: Palaeogeography, Palaeoclimatology, Palaeoecology, Vol. 123, No. 1-4, 07.1996, p. 29-47.

Research output: Contribution to journalArticle

Yokoyama, Y, Nakada, M, Maeda, Y, Nagaoka, S, Okuno, J, Matsumoto, E, Sato, H & Matsushima, Y 1996, 'Holocene sea-level change and hydro-isostasy along the west coast of Kyushu, Japan', Palaeogeography, Palaeoclimatology, Palaeoecology, vol. 123, no. 1-4, pp. 29-47. https://doi.org/10.1016/0031-0182(95)00112-3
Yokoyama, Yusuke ; Nakada, Masao ; Maeda, Yasuo ; Nagaoka, Shinji ; Okuno, Jun'ichi ; Matsumoto, Eiji ; Sato, Hiroshi ; Matsushima, Yoshiaki. / Holocene sea-level change and hydro-isostasy along the west coast of Kyushu, Japan. In: Palaeogeography, Palaeoclimatology, Palaeoecology. 1996 ; Vol. 123, No. 1-4. pp. 29-47.
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