Deformation Front Development at the Northeast Margin of the Tainan Basin, Tainan–Kaohsiung Area, Taiwan

Huang, Shipeng; Kang, Yang; Hung, Jung Chou; Wu, J.; Ting, Hsin Hsiu; Mei, Wen Wei; Hsu, Shiang Horng; Lee, Min

doi:10.1007/s11001-005-0739-z

Cited by 46 publications

(48 citation statements)

References 14 publications

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“…It locates near the southern part of Zuochen fault, and has been recognized in association with the Lungchuan anticline (Hickman et al 2002;Huang et al 2004). On the base of seismic data, Huang et al (2004) interpreted the N-S trending and east dipping Lungchuan fault as being connected to a décollement at about 6 -7 km depth. Hickman et al (2002) revealed that the horizontal velocity presents a discontinuity of nearly 2 cm yr -1 across this fault.…”

Section: Tectonic Setting Background Seismicity and Active Structurmentioning

confidence: 99%

Pre-seismic strain anomalies and coseismic deformation of Meinong earthquake from continuous GPS

Tsai¹,

Shin²,

Kuo³

2017

Terr. Atmos. Ocean. Sci.

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High strain accumulation across the fold-and-thrust belt in SW Taiwan are revealed by the Continuous GPS (cGPS) from 2007 -2015. This high strain is generally accommodated by the major active structures in fold-and-thrust belt of western Foothills. In addition, the plastic deformation of mudstone in the Gutingkeng formation might play a crucial role for aseismic creeping. Furthermore, the distributed rightlateral shear zone, fault-related folding and aseismic creeping are also dominated from Lungchuan fault and Chishan fault to the north of Kaohsiung area. Based on distribution of coseismic uplift across the Lungchuan fault to the Tainan tableland, a clear evidence of multiple fault slips was triggered by the 2016 M w 6.4 Meinong earthquake at ~15 km. The surface coseismic deformation is mainly controlled by a fault-related folding structures connected to the shallow décollement around 5 -10 km depth, in which the moderate earthquakes locate in mid-crust could trigger slip along the weak décollement. The pre-seismic baseline variation of cGPS is observed in 8 baselines near the epicenter of the Meinong earthquake. The rate-slow-down anomalies of these baseline variation could be considered as a possible precursor of the Meinong earthquake.

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Section: Tectonic Setting Background Seismicity and Active Structurmentioning

confidence: 99%

Pre-seismic strain anomalies and coseismic deformation of Meinong earthquake from continuous GPS

Tsai¹,

Shin²,

Kuo³

2017

Terr. Atmos. Ocean. Sci.

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“…features along the trending of Taiwan have been distinguished [20,21]. The central part of the Taiwan, which is characterized by high mountain peaks of Taiwan mountain ranges, is bearing the culmination of the collisional activity (Figure 1b) [22,23].…”

Section: Seismic and Sequence Stratigraphy And Integrated Stratigraphmentioning

confidence: 99%

Seismic Stratigraphic Features of the Late Miocene-Present Unconformities and Related Seismic Units, Northern Offshore Taiwan

Chang¹,

Yang²,

Hsu³

et al. 2017

Seismic and Sequence Stratigraphy and Integrated Stratigraphy - New Insights and Contributions

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We investigate the seismic stratigraphic features offshore northern Taiwan by using newly collected multichannel seismic data. Two significant regional unconformities U1 and U2 have been identified, which further subdivide the sedimentary sequence into three seismic units as SU I, SU II, and SU III. The lowermost seismic unit SU I is a pre-late Miocene sequence, while the middle and upper seismic unit SU II and SU III result from the interactions between the rapid fault-controlled subsidence and the stable thermal-controlled subsidence. We consider that the present-day offshore northern Taiwan is under a post-collisional state and the unconformities U1 and U2 represent a response to the mountain collapse and to the cessation of the regional volcano-tectonic activities. It is not until 1.5 Ma that northern offshore Taiwan became a post-collisional basin and started to receive sediments, with a rapid fault-controlled subsidence. Afterward, the basin became dominated by a stable thermal-controlled subsidence at 0.2 Ma. Although the main volcano-tectonic activities in the northern offshore Taiwan are ceased, modern geophysical and geochemical investigations have suggested that the tectonism and the volcanism are still active and represent potential threatening geohazard.

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“…South of the Lungchuan ridge, the backthrust would follow the trace of the Gutingkeng fault. The existence of this backthrust was previously proposed in Huang et al (2004) as well. We call this backthrust the Lungchuan backthrust.…”

Section: In the Lungchuan Ridge Areamentioning

confidence: 69%

“…The more pronounced topographic expression of the fold to the south and the shallower depth of stratigraphic horizons in borehole TN-1 compared to borehole TN-2 ( Fig. 1; Huang et al 2004) show that cumulative shortening must be larger to the south. To expand the balanced cross-sections to the east, we use the detachment depth of ~3.6 km and a regional dip for the detachment of 2°E to account for the geometry of the Chinese continental shelf.…”

Section: Within the Coastal Plainmentioning

confidence: 92%

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Shallow geological structures triggered during the Mw 6.4 Meinong earthquake, southwestern Taiwan

Béon¹,

Huang²,

Suppe³

et al. 2017

Terr. Atmos. Ocean. Sci.

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The Meinong earthquake generated up to ~10 cm surface displacement located 10 -35 km west of the epicenter and monitored by InSAR and GPS. In addition to coseismic deformation related to the deep earthquake source, InSAR revealed three sharp surface displacement gradients. One of them is extensional and is inconsistent with the westward interseismic shortening of ~45 mm yr -1 in this region. The gradient sharpness suggests slip triggering on shallow structures, some of which were not well documented before. To characterize these shallow structures, we investigated potential surface ruptures in the field. Sets of ~NS tension cracks distributed over 25 -300 m width, with cumulative extension in the same order as InSAR observations, were found along 5.5 km distance along the extensional gradient and are interpreted as surface rupture. We build two E-W regional balanced cross-sections, based on surface geology, subsurface data, and coseismic and interseismic geodetic data. From the Coastal Plain to the east edge of the coseismic deformation area, we propose a series of three active west-dipping backthrusts: the Houchiali fault, the Napalin-Pitou backthrust, and the Lungchuan backthrust. They all root on the 3.5 -4.0 km deep Tainan detachment located near the base of the 3-km-thick Gutingkeng mudstone. Further east, the detachment would ramp down to ~7 km depth. Coseismic surface deformation measurements suggest that, in addition to the deeper (15 -20 km) main rupture plane, mostly the ramp, the Lungchuan backthrust, and the Tainan detachment were activated during or right after the earthquake. Local extension is considered as transient deformation at the west edge of the shallow main slip zone.

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Deformation Front Development at the Northeast Margin of the Tainan Basin, Tainan–Kaohsiung Area, Taiwan

Cited by 46 publications

References 14 publications

Pre-seismic strain anomalies and coseismic deformation of Meinong earthquake from continuous GPS

Pre-seismic strain anomalies and coseismic deformation of Meinong earthquake from continuous GPS

Seismic Stratigraphic Features of the Late Miocene-Present Unconformities and Related Seismic Units, Northern Offshore Taiwan

Shallow geological structures triggered during the Mw 6.4 Meinong earthquake, southwestern Taiwan

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