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Reply to "Comment on `A Vertical Exposure of the 1999 Surface Rupture of the Chelungpu Fault at Wufeng, Western Taiwan: Structural and Paleoseismic Implications for an Active Thrust Fault,' by Jian-Cheng Lee, Yue-Gau Chen, Kerry Sieh, Karl Mueller, Wen-Shan Chen, Hao-Tsu Chu, Yu-Chang Chan, Charles Rubin, and Robert Yeats," by Yuan-Hsi Lee, Shih-Ting Lu, Tung-Sheng Shih, and Wei-Yu Wu

Institute of Earth Sciences
Academia Sinica
P.O. Box 1-55
Nankang, Taipei, R.O.C., Taiwan
(J.-C.L., Y.-C.C.)

Department of Geology
Central Washington University
Ellensberg, Washington
(C.R.)

Department of Geology
University of Colorado
Boulder, Colorado
(K.M.)

Central Geological Survey
P.O. Box 968
Taipei, R.O.C., Taiwan
(H.-T.C.)

Department of Geology
National Taiwan University
Taipei, R.O.C., Taiwan
(Y.-G.C., W.-S.C.)

Division of Geological and Planetary Sciences
100-23
Caltech
Pasadena, California
(K.S.)

Department of Geosciences
Orgon State University
Corvallis, Oregon
(R.Y.)

The first 300 words of the full text of this article appear below.

	Introduction

 
We welcome Y. H. Lee et al.'s interest in our article (Lee et al., 2001). We thank them for their comment, which provides a further opportunity for discussing the quantification of the slip amounts including horizontal and vertical components and the fault geometry for an earthquake thrust scarp in Wufeng, western Taiwan, during the 1999 M 7.6 earthquake.

In their comment, Y. H. Lee et al. used restoration of deformed concrete fence across the 1999 scarp to estimate the slip vector of the main fault. The estimated slip amount, especially the horizontal component, is different (significantly less) from our results presented in the 2001 BSSA article. They then applied an "area-balance" technique to compare their results with ours. They showed that their area-balance method favored their estimates including the slip amounts and the fault dip angle. They concluded that their estimated slip amounts are more reasonable than ours.

The fundamental questions in this issue, in our opinions, include the actual amounts of deformation (slip) and the associated deformation processes, as well as the limitation and uncertainty of the applied techniques on an earthquake-formed thrust scarp. Hereafter we attempt to answer these questions and clarify the related problems.

	Uncertainty of the Estimates

 
First, we shall discuss the techniques of the estimates of the horizontal shortening used for Y. H. Lee et al. and for our previous article. It is important to know the limitations, the uncertainties, and the possible sources of errors for any estimate or calculation of the deformation, which enables us to evaluate the results. For our line-balancing method in the previous article, the uncertainties come mainly from the complicated deformation near the main fault zone, for instance, the overlapped structures and the ductile deformation. In particular, stretching and thinning of the sedimentary layers can be clearly observed around . . . [Full Text of this Article]

	Another Area-Balancing Estimate

 

	Comparison with the Neighbor Site

 

	Further Discussion