Abstract
Neotectonic Interpretation of the different marine surveys (ACT, …) swath bathymetry and different onshore-offshore sismic profiles combined to classical structural fieldwork, geodetic, seismological and interferometric studies lead us to propose a global structural scheme and confirm the regional escape tectonics affecting both onshore-offshore of SW Taiwan. First, it is highlighted here the difficulty to only interprete the swath bathymetry even in the northern tip of the Manila accretionnary prism which is a rather simple geological context but affected by both (1) a strong amount of sedimentation due to the Taiwan mountain belt erosion, and (2) to the submarine erosion of the giant Penghu canyon. Second point, is the importance of the seismic interpretation in order to get the offshore bedding and structural data combined with the swath bathymetry and to the photointerpretation of the digital Terrain Model combined to the accurate geological maps to precisely delineate the blocks that is inferred to be submitted to a classical escape tectonic. Third, the precise study of the two new major structural boundaries Fangliao and Young-An structures which guides the SW Taiwan extrusion. Combined with onshore studies (e.g. interferometry (DINSAR), geodetic, seismology and field work) which gives (1) locations, characterization and quantification on the interseismic displacements and (2) lead us to modify our view of the global tectonic structures of the SW Taiwan. To conclude, it is highly recommended to combine both approach on and offshore geology in order to better understand geology and active structures in that part of the world.
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Acknowledgments
The authors would like to thank deeply the LIA ADEPT N°536 France-Taiwan and the Sino-French collaboration and more especially Jacques Angelier, Hu Jyr-Ching, Erwan Pathier, Benedicte Fruneau, Johann Champenois, Lu Chia-Yu, Lee C.-T., Brusset S., Chu Hao-Tsu, Lee T. Q, Lee Jian-Cheng, Jo Deramond, Rau Ruei-Juin, Li Fung Chun, Hsu Shu-Kun, Hsu Hsi-Hao, Chang Chung Pai, and Chang Tsui-Yu for so many fruitful discussions and friendship for more than two decades.
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Deffontaines, B., Char-Shine, L., Rou-Fei, C. (2015). The Extrusion of South-West Taiwan: An Offshore-Onshore Synthesis. In: Lollino, G., et al. Engineering Geology for Society and Territory - Volume 6. Springer, Cham. https://doi.org/10.1007/978-3-319-09060-3_26
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