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제주도(濟州島)에 분포(分布)하는 화산구(火山丘) 구조해석(構造解釋)에 관한 연구(硏究)
원종관 ( Chong Kwan Won ) 건국대학교 기초과학연구소 1976 理學論集 Vol.2 No.-
Jeju Island is situated in Korean Strait to the south of the main Peninsular at the geographical coordinate between longitude ED 126° 10` to 126° 58` and latitude N 33° 12` to 33° 34` Also the Island covers an area of approximately 1792.06 km2, i e., 32 km northsoutherly and 74 km eastwesterly in the short and long axial distances respectively, and the perimeter being about 263 km. The shape of the Island, a volcanic island, is of an ellipse with the long axis trending north 70° eastwardly. Mt. Hanla rising 1950m above sea level and being situated at the center of the Island, has a gentle slope toward the long axis (N70°E), of the Island whereas a more or less steep slope toward the short axis (N20°W). As far as the shape of the Island is concerned, it resembles to a Aspite type. The crater of the Mt. Hanla is called as Baegrogdam which acted as the center of the eruption throughout the history of the volcanic actions. Most of the lavas, except parasitic cones, were poured out from this crater, resulting in a symmetrical form of the volcano. Geology of Jeju Island is mainly composed Trachy-basalt and Pyroclastic materials with some trachy-andesite, trachyte and sedimentary rocks, exactly tuffaceous. These volcanic flows were erupte over more than 79 times. The Island has begun to exist from Pliocene to Quaternarey in geologic age. All most of about 400 volcanic cones is scattered on Mt. Hanla main volcanic body, shield volcano. They are classified early stage, middle stage and final stage parasitic cone in order to eruption. The first two composed of lavas and pyroclastic materials, but parasitic cones of late stage only pyroclastic materials. Therefore all most of the parasitic cones which has formed at final stage, are cinder cones. According to the observation from parasitic cones in the Island, it comes to the conclusions as follows; 1. The formation period of parasitic cones are unsimiliar each other, they are related the eruption period of lavas. The formation period is divided into three stages: early, middle and final stage. 2. The structural features of parasitic cones are almostly Konide type, platened U type, solid U type, gentle sloped dome type, Homate type and composite type. 3. The body of parasitic cones is more or less 80m in altitude. Small parasitic cones are less than 30m in altitude, they are occupied over 40percent. 4. Long axial distance of volcanic body is reached 500m. Slope angle of volcanic body is usually 25° on an average. 5. The formation element of open crater direction is mainly the influence of prevailing wind. The open crater`s directions are mainly N30° W to N25° E.