Characteristics of Active Faults in Hsinchu Area, Northwestern Taiwan
Date Issued
2012
Date
2012
Author(s)
Ding, Chuan
Abstract
In order to prevent and reduce the geo-hazard damages caused by earthquakes in the high-tech center in Hsinchu area, it is necessary to study the behavior and activity of active faults in the area, including the Hsincheng Fault, Hsinchu Fault and Hukou Fault from south to north. Major tectonic geomorphological features were mapped using 5m resolution digital terrain models (DTM) and were checked in the field. 57 bole-holes provided by Central Geological Survey are re-analyzed in order to decide the location position of the faults in areas where the fault traces are ambiguous or covered by thick Holocene deposits. For estimating long-term crustal vertical deformation rates, boleholes containing Holocene marine deposits are analyzed and C14 dating samples are collected as much as possible. Combining the dating results with the eustatic water depth, sample depth and paleo-environmental water depth, the long-term crustal vertical deformation rates since the last glacial maximum (LGM, 18 ka) can be calculated. Long-term vertical offset rate of the Hsinchu fault is 1.0 ±2.4 mm/yr, and long-term vertical offset rate of the Hukou Fault is 0.3±3.0 mm/yr. From the ages and offsets of river terraces, the long-term average vertical offset rate of the Hsincheng fault can be calculated to be 1.1±0.3 mm/yr.
Subjects
Hsinchu Fault
Hsincheng Fault
Hukou Fault
Long-term Crustal Deformation Rate
Offset Rate
SDGs
Type
thesis
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