Synorogenic extension and exhumation of the Taiwan hinterland

Crespi, Jean; Chan, Yu-Chang; Swaim, Michael S.

doi:10.1130/0091-7613(1996)024<0247:seaeot>2.3.co;2

Cited by 92 publications

(81 citation statements)

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“…Indeed, in a context of steady-state lithospheric convergence, an orogenic wedge might locally be affected by horizontal stretching without net thinning. Such features are observed in active mountain belts such as the western Alps or Taiwan (Crespi et al, 1996). Moreover, an orogenic plateau is formed as a consequence of gravity-driven flow concentrated in the weak lower crust without net thinning.…”

Section: Kinematics/dynamics/strainmentioning

confidence: 97%

The thermal–mechanical evolution of crustal orogenic belts at convergent plate boundaries: A reappraisal of the orogenic cycle

Vanderhaeghe

2012

Journal of Geodynamics

148

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Section: Kinematics/dynamics/strainmentioning

confidence: 97%

The thermal–mechanical evolution of crustal orogenic belts at convergent plate boundaries: A reappraisal of the orogenic cycle

Vanderhaeghe

2012

Journal of Geodynamics

148

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“…3). In addition to the prevailing ductile folding structures, numerous late stage brittle normal faults exist within the Central Range which were interpreted as a result of gravitational collapse following the exhumation of thickened crust (Angelier et al 1995;Crespi et al 1996). The Western Foothills domain is consists of the Miocene shallow marine deposits and the Plio-Pleistocene foreland basin (Fig.…”

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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“…The earthquake focal mechanism solutions beneath the eastern Central Range at 15 -25 km depth indicate that thrust faulting (mostly the east-vergent back-thrusting) predominated deformation throughout this region, although its location does not correspond well to the down-dip projection of the Central Range fault. While normal faulting occurs, although more sparsely, most extensional earthquakes were found within the Tananao complex, which is believed to be related to either mountain collapse in the late mountain building stage (Crespi et al 1996;Kuochen et al 2004) or rapid exhumation of the Central Range (Lin 2000).…”

Section: Geological Settingmentioning

confidence: 99%

Campaigned GPS on Present-Day Crustal Deformation in Northernmost Longitudinal Valley Preliminary Results, Hualien Taiwan

Chen¹,

Lee²,

Chen³

et al. 2014

Terr. Atmos. Ocean. Sci.

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The Longitudinal Valley in Eastern Taiwan sits at the collision suture between the Eurasian and Philippine Sea plates. Based on repeated GPS campaigned measurements from 25 stations six times in 2007 -2009, we characterize the surface deformation in the northernmost Longitudinal Valley where the Coastal Range of the Philippine Sea plate turns northward diving under the Eurasian plate producing two major active faults: the Milun fault and the Longitudinal Valley fault. We reconstructed a GPS velocity field and conducted strain analyses and elastic block modeling. Our results suggest a rapid clockwise rotation of 33° Myr -1 and an eastward tectonic escape in the small Hualien City block (HUAL) area of ~10 × 10 km, which is apparently detached from the regional rotating RYUK block defined by previous studies. We interpret it as being initiated locally by the northwest indentation of the Coastal Range, which pushed the HUAL block to move upward and eastward. According to our strain analyses, the HUAL block shows a significant internal elastic strain inside the Milun Tableland, the hanging wall of the Milun fault. No significant deformation was observed across the surface trace of the fault, indicating that the Milun fault is now probably locked in the near surface. The deformation in the footwall of the fault was accommodated by pure-shear strain with a major NNW-compression and a minor ENE-extension. The deformation in the hanging wall is characterized by simple-shear strain with ENE-extension in its northern part and little deformation in the southern part, separated by a little known NW-trending active fault zone (Dongmingyi fault), which needs further investigation.

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Synorogenic extension and exhumation of the Taiwan hinterland

Cited by 92 publications

References 0 publications

The thermal–mechanical evolution of crustal orogenic belts at convergent plate boundaries: A reappraisal of the orogenic cycle

The thermal–mechanical evolution of crustal orogenic belts at convergent plate boundaries: A reappraisal of the orogenic cycle

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

Campaigned GPS on Present-Day Crustal Deformation in Northernmost Longitudinal Valley Preliminary Results, Hualien Taiwan

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