「地震及活斷層研究」－孕震帶構造─台灣西南海域活斷層的調查與孕震構造研究(II)
Date Issued
2003
Date
2003
Author(s)
DOI
912119M002018
Abstract
This 2-year research project intends to
investigate the active fault systems and their
seismogenic properties in the area offshore
southwestern Taiwan. This report presents
the two-year study results.
In the active fault investigation,
high-resolution bathymetry map of the study
area has been compiled which reveal
distribution of complicated fault systems.
Unique structural pattern has been observed
that shows the effect of the continental
margin crust to the development of the
accretionary wedge near Taiwan. Many
topographic lineaments have been developed
3
on the frontal portion of the accretionary
wedge off southwestern Taiwan. These
lineaments could be developed due to the
tectonic escape of the southwestern Taiwan
block during the arc-continent collision
processes. The different nature of the
continental margin crust (from oceanic crust
in the south to continental crust in the north)
also contributes to the unique structural
pattern observed. A manuscript describing
this study result has been submitted to
Marine Geophysical Research and is under
review.
Original idea of extract fluids from
fault scarps to study the fault properties of a
major out-of-sequence thrust in the first year
of this project did not provide useful
information, thus the focus was shifted to
seismic study during the second year.
Several seismic reflection profiles running
across this major out-of-sequence thrust
have been analyzed, and it appears that from
south to north the fault plan geometry has
changed following the transition from
subduction to collision.
Subjects
Offshore Southwestern Taiwan
Seismic reflection
Active faults
Deformation front
SDGs
Publisher
臺北市：國立臺灣大學海洋研究所
Type
report
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