On the Abrasion-benches in the Middle Part of Sanriku Coast, Iwate Prefecture:The Ist report-Geomorphological Classification and Some Characteristics
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概要
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This report is a part of the study based on writer's theoretical hypothesis that the abrasion benches along the rocky coast are minute-landforms which suggested the earthmovement in recent time (Holocence epoch).<BR>There are many kinds of benches, and they are classified as follows: high tide-, storm-, elevated-, submerged-, low, tide-and submarine-benches ; and severally have some properties. In this area these benches have been distributed on a small scale, sujecting many factors which are rock facies, geological structure, ocean-climete or weather, degree of abrasion or wave erosion and etc.<BR>At present time the hightide-benches showing the degree of waverosion and the form of earthmovement, conspicuously are characterized by the abrupt slope and the narrow width. I supposed that the elevated benches were formed by the elevation of land or the lowering of sea-level (before 3000 and 4000 years), and then gradually are changing into the storm bench by a storm-wave, but they have been remained at 4 to 5 M. height front of the sea cliff. The heights of storm benches, showing it of the storm-wave, become higher as approching the promontory.<BR>In the sea bottom (shallower than 50 to 60 M. depth), the eroded surfaces belonging to the submarine and lowtide-benches divided into three steps or more. The submarine benches, periodecally, would be formed by the submergence of land or uplifting of sea-level at the early stage of alluvial, and the low tide-benches (shallower than 10 M depth) would be done by the present wave erosion. These eroded surfaces have been in discordance with the depositional surfaces.<BR>In consequence, I guessed the northward area of Miyako is rising and the southward is sinking at present time.
- 東北地理学会の論文
東北地理学会 | 論文
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