| dc.description.abstract | Taiwan is located at the collision zone between the Philippine sea plate and Eurasia plate, and the Longitudinal Valley Fault is the boundary fault between these two plates. Chihshang Fault is the southern part of the Longitudinal Valley Fault, it’s about 67 kilometers, it’s the reverse fault and its main active mode is creep. Tseng et al(2010) investigate the two seismic reflection survey line at Chinyuan and WanAn village in Chihshang, but their survey line spacing is short, leading to the investigating depth is not deep. In my research, we try to apply the long line spacing to survey the Chihshang fault area in November 2020, we planned three seismic survey lines: Chinyuan, WanAn, and N-S line. In addition to, we used Smartsolo 5Hz receiver in N-S line expect for greater and deeper data than traditional geophone. In the profile results, In the Chinyuan line, the shallow layer can see the continuous signal of the layer, and there is anticline structure around Chihshang fault and an east-dipping formation is at 500 ms depth (Chinyuan) profile, and there is a flower structure above it; on the east side, the boundary between continuous and discontinuous signals can be seen, which is presumed to be the main of Chihshang fault. WanAn survey line is located at the hanging wall of Chihshang fault, shallow layers of the profile are relatively chaotic, the formation isn’t continuous, and there is a series of flower structures and folding. In N-S survey line, there is a big anticline structure near the Chinyuan survey line. Because of the broadband characteristics of Smartsolo, more structures can be seen in the profile data. The maximum reflected signal can be seen up to about 800 ms, and the signal of angular unconformity can be seen in the deep part. From the profile evidence and the activity direction of the Chihshang area, we surmise that there an anticline structure below the Chihshang area, and we can try to use Smartsolo to detect deep structure for more seismic investigate in the future. | en_US |