Coastal geology and oceanography

Saito, Yoshiki; Ikehara, Ken; Tamura, Takeshi

doi:10.1144/goj.15

Cited by 7 publications

(6 citation statements)

References 184 publications

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“…These lines of evidence suggest that Lake Inba's change from a saline lagoon to a freshwater lake may have partly resulted from late Holocene sea-level changes and was not caused by the effects of the so-called Tonegawa Tosen, the artificial rerouting of the Tone River channel after AD 1594 (Inazaki et al, 2014). These results are consistent with the study of Lake Kasumigaura (Saito et al, 1990, 2016) and Kitaura (Fig. 1; Naya et al, 2007); desalination had progressed long before the two downstream side lakes.…”

Section: Discussionsupporting

confidence: 91%

“…The period was approximately 10,000–9000 cal yr BP and after which the inner bay environment expanded. In Lake Kasumigaura, the sea area expanded until approximately 4000 cal yr BP (Saito et al, 2016), but in Lake Inba it began to contract at approximately 5000 cal yr BP; the sea area also contracted from approximately 2500 to 2000 cal yr BP. At that time, a closed inner bay environment formed in Lake Kasumigaura.…”

Section: Discussionmentioning

confidence: 99%

“…At that time, a closed inner bay environment formed in Lake Kasumigaura. The desalination in Lake Inba was complete approximately 1000 yr; however, the influence of seawater remained in the downstream area and Lake Kasumigaura and Lake Kitaura (Naya et al, 2007; Naya, 2016; Saito et al, 2016). These differences reflect the respective positional relationships and the extended range of the tide level.…”

Section: Discussionmentioning

confidence: 99%

“…These differences reflect the respective positional relationships and the extended range of the tide level.

Figure 9.Comparison of the timing of salinity changes in Lake Inba, Lake Kasumigaura (Saito et al, 2016), and Lake Kitaura (Naya et al, 2007; Naya 2016; Ito et al, 2017). …”

Section: Discussionmentioning

confidence: 99%

“…On the eastern Kanto Plain of central Japan (Fig. 1a and b), the vast lowland along the Tone River has yielded evidence of landform development and palaeoenvironmental changes caused by the Holocene transgression and the subsequent regression (Kikuchi, 1969; Ota et al, 1985; Saito, 1995; Saito et al, 2016). During the Holocene transgression, the present-day lowlands along the middle and lower reaches of the Tone River (Fig.…”

Section: Introductionmentioning

confidence: 99%

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Crustal subsidence inferred from reconstruction of the Pleistocene–Holocene palaeogeography in the northern Lake Inba area, central Japan

et al. 2019

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To help characterise the palaeogeographic and lacustrine environmental changes that resulted from the Holocene transgression and residual subsidence in the eastern Kanto Plain of central Japan, we analysed four drill cores and reviewed other core data from the southern part of the Lake Inba area. Fossil diatom assemblages yielded evidence of centennial-scale palaeogeographic and salinity responses to sea-level changes since the late Pleistocene. We determined that the seawater incursion into the Lake Inba area during the Holocene transgression occurred at approximately 9000 yr. We also recognised a late Holocene regression event corresponding to the Yayoi regression, considered to have occurred from ca. 3000 to ca. 2000 yr, and a subsequent transgression. Our data clarify some of the palaeogeographic changes that occurred in the Lake Inba area and document an overall trend toward lower salinity in the lake during the regression. In particular, the environment in Lake Inba changed from brackish to freshwater no later than 1000 yr. From the detailed palaeogeographic and palaeo-sea-level reconstruction, we recognised that residual subsidence occurred during the Holocene in this area. Thus, comparison of sea-level reconstructions based on modelling and fossil diatom assemblages is effective in interpreting Holocene long-term subsidence.

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Section: Discussionsupporting

confidence: 91%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

“…These differences reflect the respective positional relationships and the extended range of the tide level.

Figure 9.Comparison of the timing of salinity changes in Lake Inba, Lake Kasumigaura (Saito et al, 2016), and Lake Kitaura (Naya et al, 2007; Naya 2016; Ito et al, 2017). …”

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Crustal subsidence inferred from reconstruction of the Pleistocene–Holocene palaeogeography in the northern Lake Inba area, central Japan

et al. 2019

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Preface: Japanese estuaries

Saito

Dettman

2021

Estuarine, Coastal and Shelf Science

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Shallow structure and late quaternary slip rate of the Osaka Bay fault, western Japan

Hamahashi,

Otsuka,

Suzuki

et al. 2024

Prog Earth Planet Sci

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The Osaka Bay is situated at a seismically active region north of the Median Tectonic Line and east of Awaji Island in western Japan, known as part of the Kinki Triangle and the Niigata–Kobe Tectonic Zone. Dense distribution of active faults and high geodetic strain rates characterize the region, posing a major seismic hazard potential to the coastal and metropolitan areas of the Kansai region. To investigate the shallow structure and recent deformation history of active faults in the Osaka Bay, we acquired 15 high-resolution seismic profiles using a Mini-GI airgun and a Boomer as active sources, together with multi-beam bathymetry data across the Osaka Bay Fault. Our seismic sections image a ~ 0.1 to 3.7 km-wide asymmetric anticline forelimb above the Osaka Bay Fault at shallow depths, coupled with a ~ 2.6 km-wide syncline to the west, and a broad, ~ 11 km-wide syncline in the footwall to the east. The synclinal axial surface at shallow depths measured in this study ranges 75°–89°. We observe the vertical displacement of the Osaka Bay Fault increasing northwards along strike. The sediment thickness on the hanging wall, however, is variable, modified by non-tectonic processes such as by tidal currents, affecting the geometry of growth strata. The most recent deformation by the Osaka Bay Fault reaches to near the seafloor by active folding, with large vertical offsets of 8–14 m over the last ~ 11 ka, and 5–11 m over the last ~ 5 ka. By combining with previously reported borehole age data, the average uplift rate on the Osaka Bay Fault is estimated to be ~ 1.0 to 1.7 m/ka during the Latest Pleistocene to Holocene. The inferred slip of the Osaka Bay Fault during the Holocene is likely to account for > 5% of the regional geodetic strain accumulation within the Kinki Triangle. Further studies to evaluate the Holocene slip rates of regional faults are necessary to assess the seismic hazards and the internal strain budgets within the Kinki Triangle and the Niigata–Kobe Tectonic Zone. Graphical abstract

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Coastal geology and oceanography

Cited by 7 publications

References 184 publications

Crustal subsidence inferred from reconstruction of the Pleistocene–Holocene palaeogeography in the northern Lake Inba area, central Japan

Crustal subsidence inferred from reconstruction of the Pleistocene–Holocene palaeogeography in the northern Lake Inba area, central Japan

Preface: Japanese estuaries

Shallow structure and late quaternary slip rate of the Osaka Bay fault, western Japan

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