『台灣地震地質研究-台灣西南部活斷層研究』─台灣西南部北港高區周圍的河流遷移與新構造運動
Other Title
Neotectonics and river migrations around the Peikang High of
southwestern Taiwan
southwestern Taiwan
Date Issued
2004
Date
2004
Author(s)
DOI
922116M002002
Abstract
This proposed investigation is mainly to focus on
the study of the relationships among the Neotectonics,
river migrations earthquake mechanism of
southwestern Taiwan.
The Taiwan mountain belt is a modern orocline
with S shape mountain front. This is mainly controlled
by the oblique convergence between the Eurasian plate
and the Philippine Sea plate. In addition to this
mechanism, most of foreland structures are strongly
influenced by the existence of the Peikang and Kuanyin
structural highs. Around the Peikang area, south to
central Taiwan, the drainage pattern shows a fan
structure with the Chow Shui Chi as a hinge axis. The
epicenter of the 1999 Chi-Chi earthquake is right on
this hinge axis. The river channels to the north of
Choshuichi (e.g. the Ta Chia Chi and the Ta Do Chi)
migrated convexly to the north whereas the river
channel to the south of the Chou Shui Chi (e.g. the Pa
Chang Chi and the Tsen Wen Chi and the Kao Ping Chi)
migrated convexly to the south. In comparing with the
structural traces of western Taiwan and using the plate
convergence direction as horizontal reference, the
Yushan Mountain is right in front of Peikang
promontory. The thrust displacement on two side of the
Peikang High, especial the north part, are larger and
more advanced than the middle part.
Subjects
Neotectonics
Taiwan Mountain Belt
River migration
Structural High
Earthquakes
SDGs
Publisher
臺北市：國立臺灣大學地質科學系暨研究所
Type
report
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