Late Pleistocene to Holocene variations in sea conditions within the Seto Inland Sea, offshore Matsuyama City, Japan

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  • 松山市沖の瀬戸内海の後期更新世から完新世までの海況変遷.

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The Seto Inland Sea formed during a rise in sea level following the Last Glacial Maximum. There are various studies of geological and geographical aspects of the formation of the Seto Inland Sea. This paper deals with temporal variations in sea conditions deduced from acoustic profiles around Nakajima Island, in the eastern part of the Houyo Islands, to the western side of Takanawa Peninsula within the western Seto Inland Sea. Our results indicate that seawater invaded this area approximately 11,000 years ago, when there were small bays to the north and southeast of Nakajima Island. Subsequent to this, the Imoko and Sekido Straits formed with caldrons. Following the formation of Takahama Strait, the shallow Ozu Bank began to form at the eastern part of the Tsurushima Strait.

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