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Department of Geography, NTNU
After the fourth phase of Taipei basin project, we have accomplished more than 100 reflec-tion seismic lines and with which the Tertiary basement as well as the Quaternary layers could be mapped over most areas of the basin. The results indicate that the basins Tertiary basement can be separated into two parts along a line extended from Kanchiao fault. The northwestern part is found as deepest as 400 m and the deepest places are along the western border near Hsinchuang fauIt. The southeastern part has its deep bottom shaped by ancient Hsientein river under the present Taipei city. The basement regularly becomes shallow toward the hillside. There is a basement rise, called Huajianng High (proposed by Wang Lee, 1978) . depicted on the Taipei basin basement contour mapin the past. In this study, we use the seismic profiles collected at Panchiao, Chungho, and Wanhwa areas to check this strange Huajianng High base-ment anomaly. The results provide strong evidences not to support the existence of such a base?ment bottom high. Due to its odd direction of distribution against the surrounding geological structure, Huajianng High seems need to be re-evaluated. We would like to suggest to drill a deepborehole at Youth Park near the center of Huajianng High to clearify this problem.
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