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

Deffontaines, Benoı̂t; Chang, Kuo-Jen; Champenois, Johann; Lin, Kate Ching-Ju; Lee, Chyi-Tyi; Chen, Rou Fei; Hu, Jyr Ching; Magalhaes, Samuel

doi:10.5194/nhess-18-829-2018

Cited by 15 publications

(11 citation statements)

References 38 publications

(70 reference statements)

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“…However, there is ongoing discussion about the fault mechanisms and activity dissecting the Hengchun Peninsula. While the official geological map (Sung 1991), as well as textbooks (Chen 2016) still present Hengchun Peninsula tectonics as dominated by a system of three thrustfaults (Manchou, Tameihsi, and Hengchun fault), recent discussions in scientific journals propose different tectonic models for the Hengchun Peninsula (e.g., Chang et al 2003;Shyu et al 2005;Huang et al 2012;Zhang et al 2014Zhang et al , 2016Giletycz et al 2015;Deffontaines et al 2018).…”

Section: Geological Background and Tectonic Settingmentioning

confidence: 99%

“…1c for the previously assumed course of the Thameihsi fault). Latest publications interpret the Kenting thrust-fold and the Hengchun transpressive strike-slip-fault to represent the outcropping top, or onshore contuinuation, of the offshore accretionary complex of the Hengchun ridge, which is part of the Manila accretionary prism (Huang et al 2012;Zhang et al 2014Zhang et al , 2016Deffontaines at al. 2018).…”

Section: Geological Background and Tectonic Settingmentioning

confidence: 99%

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The Holocene paleo-environmental history of the Gangkou River estuary, Hengchun Peninsula, Taiwan

Lüthgens¹,

Ho²,

Clemenz³

et al. 2018

Terr. Atmos. Ocean. Sci.

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The Taiwan coastal areas are facing predicted sea-level rise effects in the global climate change context. Better understanding of the mechanisms and forcing factors driving the geomorphological evolution of Taiwan's coastline is essential. We highlight the potential of small river estuaries as archives of coastal evolution and provide a paleo-environmental reconstruction of the Gangkou River estuary based on results from a combined methodological approach using geomorphological, sedimentological, and geochronological analyses. A consistent chronology was established by combining Optically Stimulated Luminescence (OSL) dating, as well as radiocarbon dating techniques. A distinct beach-rock layer allowed firm correlation of six investigated coastal profiles. Eustatic sea level change was identified as the primary coastal and estuarine landscape development forcing factor in the study area. Tectonic forcing could also be detected from the investigated sites, but has to be regarded as a subordinate secondary forcing factor. The Gangkou River estuary developed in the early Holocene at about 8 ka and was fully developed by the time the Holocene sea-level maximum was reached. With the sea-level dropping until modern times, estuarine zone relocation and a transition to terrestrial processes was initiated, leading to development of the current coastal dune system since about 2.5 ka. Major dune building phases correlate with the climate change associated with the Little Ice Age (LIA) event and stabilised towards recent times, which is in accordance with regional and over-regional coastal Aeolian records in Taiwan.

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Section: Geological Background and Tectonic Settingmentioning

confidence: 99%

Section: Geological Background and Tectonic Settingmentioning

confidence: 99%

The Holocene paleo-environmental history of the Gangkou River estuary, Hengchun Peninsula, Taiwan

Lüthgens¹,

Ho²,

Clemenz³

et al. 2018

Terr. Atmos. Ocean. Sci.

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“…30, No. 3, 351-366, June 2019 2018), active tectonics (e.g., Bi et al 2017;Gao et al 2017;Deffontaines et al 2018), coastal environment (e.g., Mancini et al 2013), geologic mapping (e.g., Bemis et al 2014;Vollgger and Cruden 2016), soil erosion (e.g., d' Oleire-Oltmanns et al 2012;Smith and Vericat 2015), fluvial processes (e.g., Langhammer and Vacková 2018), volcanos (e.g., Nakano et al 2014), glaciers (e.g., Ryan et al 2015), etc. The M w 6.4 Hualien earthquake on 6 February 2018 produced dense surface breakages in Hualien City, eastern Taiwan, over a distance of ~8 km.…”

Section: Introductionmentioning

confidence: 99%

Mapping surface breakages of the 2018 Hualien earthquake by using UAS photogrammetry

Lin¹,

Chuang²,

Yen³

et al. 2019

Terr. Atmos. Ocean. Sci.

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The distributions and characteristics of coseismic surface ruptures are the key to understand fault behaviors. However, traditional field investigations could be time consuming while toppled buildings and damaged infrastructure may be subject to repairs due to rescue missions and transportation recovery within a few days after the earthquake, leading to urgent needs for rapid, extensive surveys before surface breakages are modified. Therefore, we take advantage of UAS photogrammetry to collect aerial images and to map surface fractures for the M w 6.4 Hualien, eastern Taiwan, earthquake on 6 February 2018. The earthquake struck Hualien City and generated dense surface breakages over a distance of ~8 km. Together with control surveys for ground control points by using RTK-GPS, UAS photogrammetry uses the methods of the Structure from Motion and Multi-View Stereo to produce high-resolution orthoimages and digital surface models. Our mapping results show that surface ruptures follow the trace of the Milun fault and northern Linding fault. Mapped surface ruptures are usually in en échelon arrays or distributed fractures rather than a through-going fault. Estimated sinistral offset based on orthoimages is more than 60 cm in Chihsingtan and decreases toward south. The fault behavior of the 2018 Hualien earthquake shows along-strike variations and is somewhat different from the October 1951 earthquake.

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“…Environmental and geological monitoring can profit from fast multi-temporal acquisitions delivering high-resolution images (Thamm and Judex, 2006;Niethammer et al, 2010). RPASs can also be considered a good solution for mapping and monitoring different active processes at the earth's surface (Fonstad et al, 2013;Piras et al, 2017;Feurer et al, 2017;Hayakawa et al, 2018) such as at glaciers (Immerzeel et al, 2014;Ryan et al, 2015;Fugazza et al, 2017), Antarctic moss beds (Lucieer et al, 2014b), coastal areas (Delacourt et al, 2009;Klemas, 2015), interseismic deformations (Deffontaines et al, 2017(Deffontaines et al, , 2018 and in river morphodynamics (Gomez and Purdie, 2016;Jaud et al, 2016;Aicardi et al, 2017;Bolognesi et al, 2016;Benassai et al, 2017), debris flows (Wen et al, 2011) and river channel vegetation (Dunford et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Review article: the use of remotely piloted aircraft systems (RPASs) for natural hazards monitoring and management

Giordan

Hayakawa

Nex

et al. 2018

Nat. Hazards Earth Syst. Sci.

132

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Abstract. The number of scientific studies that consider possible applications of remotely piloted aircraft systems (RPASs) for the management of natural hazards effects and the identification of occurred damages strongly increased in the last decade. Nowadays, in the scientific community, the use of these systems is not a novelty, but a deeper analysis of the literature shows a lack of codified complex methodologies that can be used not only for scientific experiments but also for normal codified emergency operations. RPASs can acquire on-demand ultra-high-resolution images that can be used for the identification of active processes such as landslides or volcanic activities but can also define the effects of earthquakes, wildfires and floods. In this paper, we present a review of published literature that describes experimental methodologies developed for the study and monitoring of natural hazards. IntroductionIn the last three decades, the number of natural disasters showed a positive trend with an increase in the number of affected populations. Disasters not only affected the poor and characteristically more vulnerable countries but also those thought to be better protected. The Annual Disaster Statistical Review describes recent impacts of natural disasters on the population and reports 342 naturally triggered disasters in 2016 (Guha-Sapir et al., 2017). This is less than the annual average disaster frequency observed from 2006 to 2015 (376.4 events). However, natural disasters are still responsible for a high number of casualties (8733 death). In the period 2006-2015, the average number of causalities caused annually by natural disasters is 69 827. In 2016, hydrological disasters (177) had the largest share in natural disaster occurrence (51.8 %), followed by meteorological disasters (96; 28.1 %), climatological disasters (38; 11.1 %) and geophysical disasters (31; 9.1 %) (Guha-Sapir et al., 2017). To face these disasters, one of the most important solutions is the use of systems able to provide an adequate level of information for correctly understanding these events and their evolution. In this context, surveying and monitoring natural hazards gained importance. In particular, during the emergency phase it is very important to evaluate and control the phenomenon of evolution, preferably operating in near real time or real time, and consequently, use this information for a better risk assessment scenario. The available acquired data must be processed rapidly to support the emergency services and decision makers.Recently, the use of remote sensing (satellite and airborne platform) in the field of natural hazards and disasters has become common, also supported by the increase in geospatial technologies and the ability to provide and process up-to-date imagery (Joyce et al., 2009;Tarolli, 2014). Remotely sensed data play an integral role in predicting hazard events such as floods and landslides, subsidence events and other ground instabilities. Because of their acquisition mode and capabilPublished by Copern...

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

Cited by 15 publications

References 38 publications

The Holocene paleo-environmental history of the Gangkou River estuary, Hengchun Peninsula, Taiwan

The Holocene paleo-environmental history of the Gangkou River estuary, Hengchun Peninsula, Taiwan

Mapping surface breakages of the 2018 Hualien earthquake by using UAS photogrammetry

Review article: the use of remotely piloted aircraft systems (RPASs) for natural hazards monitoring and management

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