摘要(英) |
Investigating the Muchiliao Fault and Nearby Structures by
Seismic Reflection Method
Hung-Lin Wang
ABSTRACT
The Muchiliao fault lies near Pai-Ho town and follows the western border of Chia-I hills. The fault has obvious lineation pattern in topography, but there still lack geologic evidences to support its existence. The fault is ranked as a ‘suspect’ fault in the Chinese Geologic Survey’’s (CGS) active fault list. This research uses the seismic reflection method to study the Muchiliao fault including the location and the configuration of the fault. The possible mechanism of the fault’s evolution is also under investigation.
The Muchiliao fault is formed as a result of the tectonic pushing against the Bai-Ho structural high. The Kuantzuling anticline is the main structural rise of the area and the Muchiliao fault is at the bending axis of its western wing. North of the fault, the variation of the structural strata are relatively gentle, forming the Chia-I structural flat area. This flat area separates the ChiuChungkeng fault at the north and the Muchiliao fault at the south.
The general shape of the Muchiliao fault appears as a disturbance along the bending axis when the layers are bent to become the western wing of the Kuantzuling anticline. The fault, 12 km long, can be divided into the northern and southern parts. At the northern part, the fault suffers great distortion. The structural strata bend significantly with apparent breakages and/or movement along the bending axis. The breakages may have extent to the surface. We also observe interesting ‘growth folding’ around the Muchiliao fault, which shows up as that the layer dipping angles vary at different depths. At the southern part, the layer bending becomes smoother without obvious offsets, in fact, a syncline shape appears at the expected fault places.
Although the Muchiliao fault does not have great fault slips, the structural disturbance it causes might be significant. It can be assigned as an ‘active fold’ in the respect of ‘active fault’ consideration. This active structure may have characteristics of active faults, and its importance should not be underestimated. |
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