Journal cover Journal topic
Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
doi:10.5194/nhess-2017-55
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
14 Feb 2017
Review status
This discussion paper is under review for the journal Natural Hazards and Earth System Sciences (NHESS).
Active tectonics of the onshore Hengchun Fault using UAS DTM combined with ALOS PS-InSAR time series (Southern Taiwan)
Benoit Deffontaines1,2, Kuo-Jen Chang2,3, Johann Champenois4, Kuan-Chuan Lin5, Chyi-Tyi Lee2,6, Rou-Fei Chen2,7, Jyr-Ching Hu2,5, and Bénédicte Fruneau8 1Laboratoire LAREG, SR IGN-UPEM-IPGP-UDD, Marne-la-Vallée, 77454, France
2Lab. Int. Assoc. D3E N°536, CNRS-NSC France-Taiwan
3Department of Civil Engineering, National Taipei University of Technology, Taipei, 10654, Taiwan
4Laboratoire Tectonique et Mécanique de la lithosphère, IPGP, Paris, 75005, France
5Department of Geosciences, National Taiwan University, Taipei, 10617, Taiwan
6Department of Applied Geology, Central Taiwan University, Chungli, 32001, Taiwan
7Departement of Geology, Chinese Culture University, Taipei, 11114, Taiwan
8Laboratoire MATIS, Service de la Recherche IGN-UPEM, Marne-la-Vallée, 77454, France
Abstract. Geometry, characterization and quantification of active faults are major concern in Taiwan, especially following the major Chichi earthquake of September 21st, 1999. Among the targets that still remain poorly known in terms of active tectonics, are the Hengchun and Kenting faults (Southern Taiwan). From the geodynamic point of view, the latter affects the outcropping top of the Manila accretionary prism of the Manila subduction zone that runs from Luzon (N. Philippines) to Taiwan. In order to settle the location, characterization and quantification of the Hengchun fault, we needed to up-date the Chinese Petroleum Corporation (CPC, 1993) and Central Geological Survey (Sung, 1991) existing geological maps using GIS mapping and photo-interpretation of both UAS's acquisition : 1). the very high precision (< 50 cm) and resolution (< 10 cm) Digital Terrain Model, and the 2). the georeferenced aerial photograph mosaic of the studied area. Moreover, the superimposition of the resulting structural sketch map with the new PSI interferometric data acquired through the SAR ALOS 1 images, validated by GPS data, helps to give motions, characterisation and quantification of the displacements along the LOS during the monitoring time-series (2007–2011). We therefore focus herein on the geometry, the characterization and the quantification of the Hengchun Fault which is an active left-lateral transpressive fault. Finally, as the Hengchun ridge face one of the last major earthquake of Taiwan (Dec. 26th 2006, depth: 44 Km, ML = 7.0), it is needed to better constrain the active Hengchun Peninsula tectonics in order to prevent major destructions in the near future.

Citation: Deffontaines, B., Chang, K.-J., Champenois, J., Lin, K.-C., Lee, C.-T., Chen, R.-F., Hu, J.-C., and Fruneau, B.: Active tectonics of the onshore Hengchun Fault using UAS DTM combined with ALOS PS-InSAR time series (Southern Taiwan), Nat. Hazards Earth Syst. Sci. Discuss., doi:10.5194/nhess-2017-55, in review, 2017.
Benoit Deffontaines et al.
Benoit Deffontaines et al.
Benoit Deffontaines et al.

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Short summary
Earthquakes and faults pose long-lasting threats toward humans and their property. They are also detrimental to the environment in general. Taiwan, due to the high seismicity, numerous earthquakes and active faults threat the island. In order to better constrain the potential hazard and better localize the fault trace, this study review the existing geological maps, and integrates the drones images and satellite radar images, so as to decipher the consequence and the social impact.
Earthquakes and faults pose long-lasting threats toward humans and their property. They are also...
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