摘要(英) |
Recently due to the threat of faulting as occurred in the 1999 Chi-Chi earthquake (MW=7.6), the active fault studies on the Taiwan island have been largely emphasized. The Chiuhsiungkeng fault is located in the seismogenic zone along the east margin of the Peikang High. The 1906 Meishan earthquake fault (M=7.1) happened here. High earthquake potential in this populated region has always been a great issue. In this study, we used the shallow reflection seismic method to investigate the Chiuhsiungkeng fault and its nearby structures. The following conclusions are obtained :
(1) The Chiuhsiungkeng fault is flanked by two tear faults: the Gukeng fault at the north and the Chuchi fault at the south. The fault offsets gradually reduce toward the south, and on the contrary, the fault dip-angles increase. This 15km fault can be divided into three parts: the northern part (Gukeng-Tahuko), the middle part (Meishan-Nansukeng), and the southern part (Nansukeng-Chuchi).
(2) At the northern part, it is a bedding-parallel fault with a dip-angle of 30 degrees. The Cholan Formation on the hanging wall may have slipped for about 4.5 km and exposed at the surface by the fault.
(3) At the middle part, the fault cuts structural layers with an angle of 33 degrees, and the slippage distance decreases rapidly to about 400m. A Meishan range is proposed as a barrier to interfere the fault slippage from the north to the south.
(4) At the southern part, the fault becomes a small facture penetrating flat layers with an angle of 36 degrees. The fault offsets are reduced to being smaller than 50m. The fault could be terminated by the Chuchi tear fault at its southern end.
(5) The Meishan range and the Central line are two significant ramps developing in the big northward dipping slope. They play the key roles which control the fault behaviors to be in a ‘heavy-slipping north and slight-moving south’ pattern of the Chiuhsiungkeng fault. |
參考文獻 |
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