Active interseismic shallow deformation of the Pingting terraces (Longitudinal Valley – Eastern Taiwan) from UAV high-resolution topographic data combined with InSAR time series
| Autor: | Benoît Deffontaines, Kuo-Jen Chang, Johann Champenois, Bénédicte Fruneau, Erwan Pathier, Jyr-Ching Hu, Shih-Ting Lu, Yen-Chiu Liu |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
UAV
high-resolution Digital Terrain Model SAR interferometry persistent scatterers small baseline interseismic deformation Longitudinal Valley Fault Pingting terraces Eastern Taiwan Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Risk in industry. Risk management HD61 |
| Zdroj: | Geomatics, Natural Hazards & Risk, Vol 8, Iss 1, Pp 120-136 (2017) |
| Druh dokumentu: | article |
| ISSN: | 1947-5705 1947-5713 19475705 |
| DOI: | 10.1080/19475705.2016.1181678 |
| Popis: | We focus herein on the location, characterization and the quantification of the most active structural feature of Taiwan: the Longitudinal Valley Fault that corresponds to the suture in between the Philippine and Eurasian Plates. In order to determine and monitor its present inter-seismic deformation, we focus on the Pingting Terraces area, situated in the South Longitudinal Valley (Eastern Taiwan). We first determine the structural geometry issued from both photo-interpretation deduced from new unmanned aerial vehicle (UAV) high-resolution Digital Terrain Model data that we acquired (34.78 km2 with 7.73 cm ground sampling distance), combined with geological field work. In order to characterize and quantify the present deformational patterns over the Pingting terraces, we used an InSAR time series Interferometry algorithm (MT-InSAR) applied to nine L-band SAR images from ALOS satellite acquired over the period 2007–2010. The unprecedented density of measurements (about 120 points per km2 for a total of 6,400 points) gives a continuous overview of the inter-seismic shallow deformation. The structural geometry combined with the mean velocity map (MT-InSAR) reveals two clear active faults situated above the scarps of the Pingting terraces and responsible for up to 7 and 20 mm/yr velocity offset along the radar line of sight. A temporal analysis of the deformation is performed with one measurement at each SAR acquisition date, giving major improvements in the characterization and quantification of the Longitudinal Valley active Fault trace. |
| Databáze: | Directory of Open Access Journals |
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