Displacement Behavior of a Line-Shaped Elevated Structure Due To Crustal Deformation in Sw Taiwan

Abstract eng:
Taiwan is situated at the junction of the Manila and Ryukyu subduction systems, and is a typical example of the ongoing arc-continent collision due to the convergence between the Eurasian and Philippine Sea plates. The plate convergence rate across the island is about 80 mm/yr in the direction of N310°E. Long-term GPS observations demonstrate that the material in SW Taiwan is forced to extrude toward WSW, sub-parallel to the edge of the stable continental margin, via strain partitioning along several major fault structures, as a result of the interaction between the Peikang Basement High and westward propagation of the Philippine Sea plate. Data from GPS and leveling surveys further indicate that a distinct discontinuity in crustal movement exists with respect to both direction and magnitude across the CHNF creeping fault. The alignments of line-shaped transportation infrastructure in SW Taiwan have been strongly affected by crustal deformation in both lateral and vertical directions. This paper first introduces the background of regional crustal deformation due to tectonic movement, followed by contemporary observed displacement behaviors of an elevated structure from the bedrock, ground level, pile structure, pier structure, and elevated superstructure at the deck level. Furthermore, this paper proves that the short term uplift rates measured by leveling surveys on the elevated structure conform to the pattern of long term uplift rate of crustal displacement in the area across the creeping fault, based on studies of radiocarbon 14 dating ( C) and nannofossil analysis.

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