Re-evaluation of the surface ruptures of the November 1951 earthquake series in eastern Taiwan, and its neotectonic implications

Ôta, Yôko; Chung, Lap-Loi; Chen, Yue‐Gau; Lee, Jian‐Cheng; Sieh, Kerry

doi:10.1016/j.jseaes.2006.07.018

Cited by 58 publications

(73 citation statements)

References 31 publications

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“…According to some outcrop observations of the 1951 earthquake sequence, the northern part of the LVF exhibits relatively large left-lateral strike slip motion, the middle part thrusting dominantly with left-lateral motion, and the southern part smaller displacement [Hsu, 1962;Shyu et al, 2007]. This pattern is similar to our calculated coseismic displacement and results of the inverted faulting mechanism and can be identified in our calculations.…”

Section: Comparison With Surface Deformation and Seismological Datasupporting

confidence: 89%

“…Although both faults are active, recent GPS data indicates the Central Range fault to be relatively stable when compared with the LVF, which is very active with 3$4 cm/a of displacements being consumed along its length, resulting in high seismicity [Yu et al, 1997;Yu and Kuo, 2001;Kuochen et al, 2004;Shyu et al, 2006] (Figures 1 and 2). According to geomorphic evidence, the northern part of LVF is leftlateral strike-slip faulting dominantly, and from the central to southern part of the LVF there is thrusting associated with a left-lateral component [Shyu et al, 2005[Shyu et al, , 2007.…”

Section: Geological Background Of the Longitudinal Valley Fault (Lvf)mentioning

confidence: 99%

“…It was characterized by a series of large earthquakes (4 events of magnitude greater than 7) [Cheng et al, 1996] starting in the north and progressively propagating southward. Eightyfive people died and more than one thousand were hurt [Hsu, 1962;Cheng et al, 1996;Shyu et al, 2007]. Obvious surface ruptures were observed from the Hualien to Yuli areas.…”

Section: Introductionmentioning

confidence: 99%

“…Obvious surface ruptures were observed from the Hualien to Yuli areas. In some outcrops, right-lateral strike-slip faulting associated with a thrusting component were observed [Hsu, 1962;Shyu et al, 2007].…”

Section: Introductionmentioning

confidence: 99%

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Coseismic displacement and tectonic implication of 1951 Longitudinal Valley earthquake sequence, eastern Taiwan

Lee¹,

Chen²,

Rau³

et al. 2008

J. Geophys. Res.

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The Longitudinal Valley Fault (LVF) in eastern Taiwan is an extremely active fault with 3–4 cm of displacements consumed each year along its length. The fault forms the suture zone between the Philippine Sea and Eurasian plates as a result of an oblique arc continental collision. From 22 October to 5 December 1951, four earthquakes (Ms > 7) shook the LVF. We used triangulation (from 1917 to 1921 to 1976–1978) and interseismic GPS (from 1990 to 1995) data to estimate coseismic displacements of the 1951 earthquake sequences. Coseismic displacement progressively decreases from north to south and the azimuth changes from north to NE, then to a NW direction. According to the inverted faulting mechanism, the Longitudinal Valley fault can be separated into three segments. Both the northern and central segments have a high dip angle to the east, but the southern segment is of listric fault geometry. The northern segment exhibits dominantly left lateral strike‐slip faulting with reverse component, while the middle exhibits thrusting dominantly, and the southern segment exhibits thrusting with left‐lateral motion associated with a smaller coseismic displacement. In addition, this three‐segment deformation model can explain the pattern of recent crustal deformation along the LVF and Coastal Range.

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Section: Comparison With Surface Deformation and Seismological Datasupporting

confidence: 89%

Section: Geological Background Of the Longitudinal Valley Fault (Lvf)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Coseismic displacement and tectonic implication of 1951 Longitudinal Valley earthquake sequence, eastern Taiwan

Lee¹,

Chen²,

Rau³

et al. 2008

J. Geophys. Res.

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“…The length of this fault is 37.2 km and the fault dips at 75° and extends to a depth of 15.0 km. Based on the dating result of marine terraces, Chen et al (2010) (Yang 1953;Hsu 1962 (Hsu 1962;Cheng et al 1996;Shyu et al 2007). The seismicity of this fault also illuminated that it has a listric shape, dipping at 75° to a depth of 5.0 km, 60° between 5.0 -15.0 km deep, and finally 45° to a depth of 20.0 km.…”

Section: Seismogenic Structures Of Taiwan and Their Parametersmentioning

confidence: 99%

A New On-Land Seismogenic Structure Source Database from the Taiwan Earthquake Model (TEM) Project for Seismic Hazard Analysis of Taiwan

Ôta¹,

Chuang²,

Chen³

et al. 2016

Terr. Atmos. Ocean. Sci.

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Taiwan is located at an active plate boundary and prone to earthquake hazards. To evaluate the island's seismic risk, the Taiwan Earthquake Model (TEM) project, supported by the Ministry of Sciences and Technology, evaluates earthquake hazard, risk, and related social and economic impact models for Taiwan through multidisciplinary collaboration. One of the major tasks of TEM is to construct a complete and updated seismogenic structure database for Taiwan to assess future seismic hazards. Toward this end, we have combined information from pre-existing databases and data obtained from new analyses to build an updated and digitized three-dimensional seismogenic structure map for Taiwan. Thirty-eight on-land active seismogenic structures are identified. For detailed information of individual structures such as their long-term slip rates and potential recurrence intervals, we collected data from existing publications, as well as calculated from results of our own field surveys and investigations. We hope this updated database would become a significant constraint for seismic hazard assessment calculations in Taiwan, and would provide important information for engineers and hazard mitigation agencies.

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Spatiotemporal evolution of seismic and aseismic slip on the Longitudinal Valley Fault, Taiwan

et al. 2014

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The Longitudinal Valley Fault (LVF) in eastern Taiwan is a high slip rate fault (about 5 cm/yr), which exhibits both seismic and aseismic slip. Deformation of anthropogenic features shows that aseismic creep accounts for a significant fraction of fault slip near the surface, whereas a fraction of the slip is also seismic, since this fault has produced large earthquakes with five Mw>6.8 events in 1951 and 2003. In this study, we analyze a dense set of geodetic and seismological data around the LVF, including campaign mode Global Positioning System(GPS) measurements, time series of daily solutions for continuous GPS stations (cGPS), leveling data, and accelerometric records of the 2003 Chenkung earthquake. To enhance the spatial resolution provided by these data, we complement them with interferometric synthetic aperture radar (InSAR) measurements produced from a series of Advanced Land Observing Satellite images processed using a persistent scatterer technique. The combined data set covers the entire LVF and spans the period from 1992 to 2010. We invert this data to infer the temporal evolution of fault slip at depth using the Principal Component Analysis‐based Inversion Method. This technique allows the joint inversion of diverse data, taking the advantage of the spatial resolution given by the InSAR measurements and the temporal resolution afforded by the cGPS data. We find that (1) seismic slip during the 2003 Chengkung earthquake occurred on a fault patch which had remained partially locked in the interseismic period, (2) the seismic rupture propagated partially into a zone of shallow aseismic interseismic creep but failed to reach the surface, and (3) that aseismic afterslip occurred around the area that ruptured seismically. We find consistency between geodetic and seismological constraints on the partitioning between seismic and aseismic creep. About 80–90% of slip on the southern section of LVF in the 0–26 km, seismogenic depth range, is actually aseismic. We infer that the clay‐rich Lichi Mélange is the key factor promoting aseismic creep at shallow depth.

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Re-evaluation of the surface ruptures of the November 1951 earthquake series in eastern Taiwan, and its neotectonic implications

Cited by 58 publications

References 31 publications

Coseismic displacement and tectonic implication of 1951 Longitudinal Valley earthquake sequence, eastern Taiwan

Coseismic displacement and tectonic implication of 1951 Longitudinal Valley earthquake sequence, eastern Taiwan

A New On-Land Seismogenic Structure Source Database from the Taiwan Earthquake Model (TEM) Project for Seismic Hazard Analysis of Taiwan

Spatiotemporal evolution of seismic and aseismic slip on the Longitudinal Valley Fault, Taiwan

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