Abstract
This study adopts the Chiu-fen-erh-shan landslide as a case study for incorporating comprehensive accelerograph and global positioning system (GPS) data to determine the best-fit acceleration data for analyzing a rock avalanche. Previous investigations indicate that the distance from an accelerograph to a landslide site is crucial to determining the best-fit acceleration data to use in conducting a seismic analysis. Unfortunately, the Chiu-fen-erh-shan landslide and its nearest accelerograph station are located in different geological zones. Thus, GPS data were compared to the displacements derived from the accelerograms of nearby monitoring stations to help select the best accelerograph data. This emphasizes that a high density distribution of accelerographs and GPS installations are essential to acquire the best data for the seismic analysis, especially in complex geological zones. After applying the best-fit accelerogram to Newmark’s sliding model and an empirical displacement attenuation formula to back-calculate the shear strength parameters of the sliding surface, a cohesion of 0 kPa and friction angle of the sliding surface of 24.8° were found for this landslide.
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Acknowledgments
This work was supported by National Science Council of Taiwan under Contract No. 95-2221-E-006-178 and the Landmark Project of National Cheng Kung University, Taiwan under No. C0043. Professor Kuo-Fong Ma of the Department of Earth Science & Institute of Geophysics, National Central University, Taiwan, is appreciated for her theoretical discussions. Special appreciations will give to the reviewers for their valuable comments.
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Wu, JH., Lin, HM. Analyzing the shear strength parameters of the Chiu-fen-erh-shan landslide: integrating strong-motion and GPS data to determine the best-fit accelerogram. GPS Solut 13, 153–163 (2009). https://doi.org/10.1007/s10291-008-0101-4
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DOI: https://doi.org/10.1007/s10291-008-0101-4