Active tectonics of the onshore Hengchun Fault using UAS DSM combined with ALOS PS-InSAR time series (Southern Taiwan)
Benoît Deffontaines,Kuo-Jen Chang,Johann Champenois,Kuan Chuan Lin,Chyi Tyi Lee,Rou-Fei Chen,Jyr-Ching Hu,Samuel Magalhaes +7 more
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TLDR
In this article, the Hengchun and Kenting faults were studied from a geodynamic point of view and a very high precision digital surface model (DSM) and a georeferenced aerial photograph mosaic of the studied area.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, M L= 7.0), Hengchun Peninsula active tectonics
must be better constrained in order if possible to prevent major destructions
in the near future.read more
Citations
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