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 language | English |
|---|---|
| Pages (from-to) | 29-47 |
| Number of pages | 19 |
| Journal | Palaeogeography, Palaeoclimatology, Palaeoecology |
| Volume | 123 |
| Issue number | 1-4 |
| DOIs | |
| Publication status | Published - Jul 1996 |
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All Science Journal Classification (ASJC) codes
- Oceanography
- Ecology, Evolution, Behavior and Systematics
- Earth-Surface Processes
- Palaeontology
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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 journal › Article
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TY - JOUR
T1 - Holocene sea-level change and hydro-isostasy along the west coast of Kyushu, Japan
AU - Yokoyama, Yusuke
AU - Nakada, Masao
AU - Maeda, Yasuo
AU - Nagaoka, Shinji
AU - Okuno, Jun'ichi
AU - Matsumoto, Eiji
AU - Sato, Hiroshi
AU - Matsushima, Yoshiaki
PY - 1996/7
Y1 - 1996/7
N2 - 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.
AB - 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.
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U2 - 10.1016/0031-0182(95)00112-3
DO - 10.1016/0031-0182(95)00112-3
M3 - Article
AN - SCOPUS:0029952061
VL - 123
SP - 29
EP - 47
JO - Palaeogeography, Palaeoclimatology, Palaeoecology
JF - Palaeogeography, Palaeoclimatology, Palaeoecology
SN - 0031-0182
IS - 1-4
ER -