Active tectonics of the onshore Hengchun Fault using UAS DSM combined with ALOS PS-InSAR time series (Southern Taiwan) - Archive ouverte HAL Access content directly
Journal Articles Natural Hazards and Earth System Sciences Year : 2018

Active tectonics of the onshore Hengchun Fault using UAS DSM combined with ALOS PS-InSAR time series (Southern Taiwan)

(1) , , (1) , , , , ,
1
Kuo-Jen Chang
  • Function : Author
Kuan-Chuan Lin
  • Function : Author
Chyi-Tyi Lee
  • Function : Author
Rou-Fei Chen
  • Function : Author
Jyr-Ching Hu
  • Function : Author
Samuel Magalhaes
  • Function : Author

Abstract

Characterizing active faults and quantifying their activity are major concerns in Taiwan, especially following the major Chichi earthquake on 21 September 1999. Among the targets that still remain poorly understood in terms of active tectonics are the Hengchun and Kenting faults (Southern Taiwan). From a geodynamic point of view, the faults affect the outcropping top of the Manila accretionary prism of the Manila subduction zone that runs from Luzon (northern Philippines) to Taiwan. In order to better locate and quantify the location and quantify the activity of the Hengchun Fault, we start from existing geological maps, which we update thanks to the use of two products derived from unmanned aircraft system acquisitions: (1) a very high precision (< 50 cm) and resolution (< 10 cm) digital surface model (DSM) and (2) a georeferenced aerial photograph mosaic of the studied area. Moreover, the superimposition of the resulting structural sketch map with new Persistent Scatterer Interferometric Synthetic Aperture Radar (PS-InSAR) results obtained from PALSAR ALOS images, validated by Global Positioning System (GPS) and leveling data, allows the characterization and quantification of the surface displacements during the monitoring period (2007-2011). We confirm herein the geometry, characterization and quantification of the active Hengchun Fault deformation, which acts as an active left-lateral transpressive fault. As the Hengchun ridge was the location of one of the last major earthquakes in Taiwan (26 December 2006, depth: 44 km, ML= 7.0), Hengchun Peninsula active tectonics must be better constrained in order if possible to prevent major destructions in the near future.
Fichier principal
Vignette du fichier
nhess-18-829-2018.pdf (23.62 Mo) Télécharger le fichier
Origin : Publisher files allowed on an open archive

Dates and versions

insu-03589367 , version 1 (25-02-2022)

Licence

Attribution - CC BY 4.0

Identifiers

Cite

Benoit Deffontaines, Kuo-Jen Chang, Johann Champenois, Kuan-Chuan Lin, Chyi-Tyi Lee, et al.. Active tectonics of the onshore Hengchun Fault using UAS DSM combined with ALOS PS-InSAR time series (Southern Taiwan). Natural Hazards and Earth System Sciences, 2018, 18, pp.829-845. ⟨10.5194/nhess-18-829-2018⟩. ⟨insu-03589367⟩
26 View
5 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More