Shallow Seismic Imaging of Blind-Thrust Faults in Northern Taiwan 
                            And Puente Hills Los Angeles, California.

                                    2006/01/05 Hung-Lin Wang

                                             Abstract

                  Recently abundant evidence from surface geologic investigation has 
                been cited to identify an active fault which happens to pass through a major
                computer-manufacturing area in northern Taiwan .We use ‘1 sec’ 
                high-resolution shallow seismic reflection sections to examine the near 
                surface structure of this fault. The results, however, do not support the 
                geologic observations. A folding above a shallow decollement was found in 
                the fault’s northern portion, which may include shallow minor faulting. In 
                the remaining portion, the structural layers were found to lie flat without 
                offsets, except for slight buckling. The fault could have displacements at 
                deeper places (‘ blind thrust ’?), but the shallow parts do not seem much 
                affected. 

                The structure in Taiwan is similar to Puente Hills blind-thrust fault
                system, Los Angeles basin, California. High-resolution seismic reflection 
                profiles image discrete folds in the shallow subsurface above two segments 
                of the Puente Hills blind-thrust fault system. The Santa Fe Springs segment 
                of the Puente Hills fault zone shows an upward-narrowing kink band with an 
                active anticlinal axial surface, consistent with fault-bend folding above an 
                active thrust ramp. The Coyote Hills segment shows an active synclinal axial 
                surface that coincides with the base of a 9-m-high scarp, consistent with 
                tip-line folding or the presence of a backthrust . 

                By way of compare with these two case, we may be can set up some 
                model to explain the structure in Taiwan.

                                            References

              Chien-Ying Wang, Yi-Hen Lee, and Yu-Yen Hu (2005) : Re-evaluating an active 
                fault in a major computer-manufacturing area in northern Taiwan using ‘1 sec’ shallow
                reflection seismics .G. R. L. , Vol. 32, L08313, doi:10.1029/2005GL022344, 2005

                                          (Abstract)(Full text)

              Thomas L. Pratt, John H. Shaw, James F. Dolan and Shari A. Christofferson, 
              Robert A. Williams and Jack K. Odum, Andreas Plesch (2002) :Shallow seismic 
              imaging of folds above the Puente Hills blind-thrust fault, Los Angeles, 
              California G. R. L. , VOL. 29, NO. 9, 1304, 10.1029/2001GL014313, 2002

                                          (Abstract)(Full text)

              胡玉燕 (2005) 以淺層反射震測探測新城斷層地下構造。國立中央大學地球物理研究所碩士論文，共95頁。