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Herein, we investigate the fault margin that controls the development of the Yogyakarta graben by integrating gravity maps, remote sensing, and foraminifera in Yogyakarta, in the southern part of Cent...ral Java, Indonesia. A topographic map was involved to this research to create a shaded map using a Digital Elevation Model (DEM). All data sets were converted into GIS-compatible formats. Our results indicated that two major faults can be recognized. These major faults divided the area into three parts, including the western, central and eastern parts. The uplift rates of each part were different and created a depressed block control by two parallel faults. Based on foraminifera fossil observations, each block was in the same depositional environment (inner neritic) during N9 (about 14.8.15.1 Ma). The uplift occurred after deposition of marls (Kepek and Upper Sentolo Formations) during the Pliocene, which was then followed by an extension phase since the Pleistocene. The present positions indicate that the western part was uplifted higher than the others, with this part being uplifted more than 590 meters. The central part was uplifted less than 120 meters, and the eastern part was uplifted above an altitude of 170.300 meters.続きを見る
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