Fault activity and lateral extrusion inferred from velocity field revealed by GPS measurements in the Pingtung area of southwestern Taiwan

Hu, Jyr Ching; Hou, Chin-Shyong; Shen, Li; Chan, Yu-Chang; Chen, Rou Fei; Huang, C.I.; Rau, R.; Chen, Kate Hui Hsuan; Lin, Chii Wen; Huang, M. H.; Nien, Pei Fen

doi:10.1016/j.jseaes.2006.07.020

Cited by 33 publications

(58 citation statements)

References 53 publications

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“…However, the fault analysis suggests a normal displacement on the CHNF (Gourley et al 2012). In addition, GPS measurements indicate that the CHNF is a reverse fault with a rightlateral strike-slip component (Ching et al 2007(Ching et al , 2011bHu et al, 2007;Lacombe et al, 2001). For the FTFZ (number 9 in Fig.…”

Section: Geological Backgroundmentioning

confidence: 99%

Tectonic effect for establishing a semi-dynamic datum in Southwest Taiwan

Ching

Chen

2015

Earth Planet Sp

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To accommodate the effects of crustal deformation in the current national static geodetic datum (Taiwan Geodetic Datum 1997 (TWD97)) in SW Taiwan, 221 campaign-mode global positioning system (GPS) stations from 2002 to 2010 were used in this study to generate a surface horizontal velocity model for establishing a semi-dynamic datum in SW Taiwan. An interpolation method, Kriging, and a tectonic block model, DEFNODE, were used to construct the surface horizontal velocity model. Forty-four continuous GPS stations were used to examine the performance of the semi-dynamic datum through exterior validation. The average values of the residual errors obtained using the Kriging method for the north and east components are ±1.9 and ±2.2 mm/year, respectively, whereas those obtained using the block model are ±2.0 and ±2.9 mm/year, respectively. The distribution of residuals greater than 5 mm/year for both models generally corresponds to a high strain rate area derived using the horizontal velocity field. In addition, these residuals may result from deep-seated landslide and active folding or mud diapir in a mudstone area. Similar exterior checking results obtained using the Kriging interpolation method and block model for SW Taiwan indicate a high station density and a relatively satisfactory station spatial coverage. However, the block model is superior to the Kriging method due to the consideration of characteristics of the geological structure in the block model. In addition, result from traditional coordinate transformation was used to compare with the semi-dynamic datum. The results indicate that a semi-dynamic datum is a feasible solution for maintaining the accuracy of TWD97 at an appropriate level over time in Taiwan.

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Section: Geological Backgroundmentioning

confidence: 99%

Tectonic effect for establishing a semi-dynamic datum in Southwest Taiwan

Ching

Chen

2015

Earth Planet Sp

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“…7a). It reaches about 50 -55 mm yr -1 in the Kaohsiung-Pingtung area and deviate about 25 -30° counterclockwise in the direction near the Kaohsiung-Pingtung coast, in which the tectonic extrusion plays an important role for counterclockwise block rotation (e.g., Hu et al 2007;Ching et al 2007). For vertical deformation, a significant subsidence occurred in coastal area of Chiayi and Pingtung area due to the over pumping of ground water for aquaculture usage (e.g., Hou et al 2005;Lin et al 2010;Hsieh et al 2011;Tung and Hu 2012).…”

Section: The High Precision Velocity Field From 2007 -2015mentioning

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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“…However, results from geodetic and seismic studies do not show major activity of the fault at present. The velocity gradient across the CCF from dense GPS measurements is not significant (Hu et al 2007). Also, no earthquake is clearly related to the fault in relocated background seismicity (Wu et al 2008b).…”

Section: Is the Chaochou Fault The Causative Fault?mentioning

confidence: 99%

The Preliminary Study of the 4 March 2010 Mw 6.3 Jiasian, Taiwan Earthquake Sequence

Huang

Lin

et al. 2011

Terr. Atmos. Ocean. Sci.

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On 4 March 2010, an inland M w 6.3 earthquake occurred near the town of Jiasian in Kaohsiung County, Taiwan causing large ground shaking and extensive damage. In this study, we integrate the records from the Central Weather Bureau Seismic Network (CWBSN) and Taiwan Strong Motion Instrumentation Program (TSMIP) to obtain the relocated earthquake sequence and its first-motion focal mechanisms. This dataset offers us precise and reliable results which suggest a focal depth of 23 km and a possible fault plane of strike 313°, dip 41°, and rake 42° for the Jiasian earthquake. This fault plane significantly differs from the N-S striking Chaochou Fault (CCF) as well as the principal trend of Taiwan orogenic belt, and should be an undiscovered fault in southern Taiwan. The relocated Jiasian earthquake sequence initiating from the 23-km-deep mainshock and terminating at around 10 km in depth also indicates it is a blind fault. Peak ground acceleration (PGA) and peak ground velocity (PGV) recorded by the TSMIP stations reveal a distinct NW-SE-shape pattern from the epicenter area toward the Chiayi region, likely due to the directivity and site effects. Such phenomena should be considered for future regional hazard assessments.

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Fault activity and lateral extrusion inferred from velocity field revealed by GPS measurements in the Pingtung area of southwestern Taiwan

Cited by 33 publications

References 53 publications

Tectonic effect for establishing a semi-dynamic datum in Southwest Taiwan

Tectonic effect for establishing a semi-dynamic datum in Southwest Taiwan

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

The Preliminary Study of the 4 March 2010 Mw 6.3 Jiasian, Taiwan Earthquake Sequence

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