台灣地震地質研究-台灣西南部活斷層研究─台灣西南部活動斷層之長期滑移速率及其相關之構造地形(1/3)
Date Issued
2005
Date
2005
Author(s)
DOI
932119M002026
Abstract
This project will collaborate with other principal investigators in the integrate project to
work on the neotectonics of southwestern Taiwan. As we know, 42 active faults have been
identified by Central Geological Survey, ROC. Except for the Chelungpu fault, the 1999
earthquake fault, we only have insufficient information on the others. Based on the Chi-Chi
experience, this project aims to find out the potential earthquake faults in the proposed area and
figure out their long-term slip rates. Hopefully, we can prepare well before next disaster coming. The methods of Geomorphology and Geochronology will be adopted in this project. The
GIS software and 40m DEM of Taiwan have been used to roughly divide the study area into
several neotectonic domains by characterized geomorphic features and distinguishable structures. The high priority domain has been started to study by high resolution DEM (<5m),
produced by aerial photos and high-resolution satellite imagery (QuickBird and Ikonos). The
result provides precise tectonic features that can be linked to active fault systems, i.e. Hengchun,
Chouchao, and Chukou-Tachienshan. On the other hand, the distribution of the seismicity
provides a good opportunity to further understand the subsurface geological structures. We
will use the relocated earthquakes to establish the seismogenic structures by the 3-D modeling
software (GOCAD). The last step is to combine the surface features with the subsurface
structural framework to give an evaluation on the faulting mechanism and behavior.
For the purpose of computing the recurrence interval, dating methods of radiocarbon,
optical stimulated luminescence (OSL), and thermoluminescence (TL) are used to build up the
time frame. The dating methods can also be applied to the river terraces and tablelands in the
surrounding area to derive the long-term slip rates of the active structures, which is of great
importance in evaluating the current situation of the active faults. For confirmation of the
residual luminescence signals in the fluvial sediment, a new single-grain reader is urgently
needed to solve the poorly-bleached problem and provide more terraces ages.
The project plans three more years to accomplish the goals: 1) to evaluate of
characteristics on all active faults by surface and subsurface datasets; 2) to figure out the
long-term slip rate of them; 3) to improve the dating techniques.
Subjects
neotectonic activity
geographic information system (GIS)
digital elevation model (DEM)
3-D
modeling software (GOCAD)
modeling software (GOCAD)
14 C dating
optically stimulated luminescence dating (OSL)
thermoluminescence dating (TL)
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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