We have found several sites with evidence of surface active faulting along the Longitudinal Valley Fault, in particular along the Chihshang Fault segment. Hereafter are the examples of wall fracuturing due to the vigorous, continuous faulting near the surface fault zone along LVF.
1. Tapo slope
This is a fractured wall on the side of a road entering the Tapo Villiage. The wall shows a reverse-fault-type fractures, which is different than the fractures due to gravational effect on the slope edge. The fractures were first discovered in 1983 by Barrier and Chu (1984) on an old wall. After rebuilt of wall in 1985-1986, the new fractures soon developed around the same places. We conducted an annually repeated measurement on the wall to reconstruct the slip evolution at the site from 1989 to 1993. Unfurtunately, the wall collapsed and a new more solid wall was rebuilt in 1994.
2. Nanhai-Tientao Channel
Three fractures zones at a distance of about 100 m have been found in the Nanhai Tientao Channel. Two fractures zones are located on the two sides of a bridge, which seems to be quite solid and different to break. One fracture zone is located at the downstream end of the concret channel.
Fractures on the wall upstream side of the bridge.
Fractures on the wall downstream side of the bridge
Extruded upper block of the channel at the downstream end.
3. Chinyuan Rivier Channel
Three branches of faulted fractures can be observed in the Chinyuan River Channel. We have installed three creep meters across each branch of fault.
Fractures of the primary fault (westermost fault).
Fractures of the middel fault.
Fracture of the backthrust fault.
4. North bank of Ni-Shui-Chi
Fractures of faulting on the retaining wall of the north bank of the Ni-Shui Chi (Muddy water River).
5. Dian-Kuang Village Channel
Fracture of the fault in Dian-Kuang Village Channel (westernmost branch)..
6.Northern Double-flat in Ruey-Yuan