https://scholars.lib.ntu.edu.tw/handle/123456789/626733
標題: | Realization approach of non-linear postseismic deformation model for Taiwan semi-kinematic reference frame | 作者: | Chen, KH RAY Y. CHUANG Ching, KE |
關鍵字: | Datum; Interseismic velocity; Coseismic displacement; Postseismic deformation; LONGITUDINAL VALLEY FAULT; ARC-CONTINENT COLLISION; EASTERN TAIWAN; CHENGKUNG EARTHQUAKE; LANDERS EARTHQUAKE; CRUSTAL MOTION; ACTIVE FAULT; RELAXATION; CALIFORNIA; SUTURE | 公開日期: | 十二月-2020 | 出版社: | SPRINGER | 卷: | 72 | 期: | 1 | 來源出版物: | EARTH PLANETS AND SPACE | 摘要: | Surface displacements associated with earthquake-cycle deformation of active faults significantly influence the accuracy of geodetic datum and reference frames, especially for the Taiwan area with high plate convergence and deformation rates. Following the current architecture of the semi-kinematic reference frame in Taiwan, which does not particularly consider the non-linear behavior of postseismic deformation, we explored the methods to implement a non-linear postseismic deformation model using the 2003 Chengkung earthquake as an example. Together with linear interseismic function, we utilized a logarithmic function to approximate the non-linear postseismic decays. For the time series without preseismic observations, we removed the interseismic velocities by spatial interpolation and fitted the resultant time series with the logarithmic function. After estimating postseismic decays for all GPS stations, we conducted two grid models of accumulative displacements for only postseismic deformation and total deformation after the earthquake. The first grid model provides a useful prediction for tracking surface movements, and the latter model provides a straightforward view to access the timing and amount of displacements to correct the semi-kinematic reference frame. The implementation of the grid models can well approximate non-linear postseismic trends for the semi-kinematic reference frame.[Figure not available: see fulltext.]. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/626733 | ISSN: | 13438832 | DOI: | 10.1186/s40623-020-01209-y |
顯示於: | 地理環境資源學系 |
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