Geomorphology of the southernmost Longitudinal Valley fault: Implications for evolution of the active suture of eastern Taiwan

Ôta, Yôko; Sieh, Kerry; Chen, Yue‐Gau; Chuang, R. Y.; Wang, Yu; Chung, Lap-Loi

doi:10.1029/2006tc002060

Cited by 42 publications

(69 citation statements)

References 24 publications

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“…Most of the long-term slip rates were determined by vertical offset observed either in borehole data (e.g., Chen et al 2008a) or by the deformation of surfaces (e.g., Shyu et al 2008). However, the horizontal offsets by strike-slip structures are difficult to observe.…”

Section: Discussionmentioning

confidence: 99%

“…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. Several previous studies reported that the slip rate of this fault is between 20.5 -32 mm yr -1 (Chen 2006(Chen , 2010Shyu et al 2006bShyu et al , 2008. However, this fault is also known for its aseismic creeping (e.g., Angelier et al 1997;Lee et al 2001).…”

Section: Seismogenic Structures Of Taiwan and Their Parametersmentioning

confidence: 99%

“…With a length of 17.5 km, the fault dips at 45° to a depth of 2.0 km, then dips at 30° to a depth of 4.0 km. Based on the ages of deformed terraces, it has been reported that the upthrown side of the fault has an uplift rate of 4.5 mm yr -1 (Shyu et al 2008), and the fault has a slip rate of 5.4 mm yr -1 (Chen 2010). We estimated a slip rate of 6.34 ± 0.17 mm yr -1 for this fault.…”

Section: Seismogenic Structures Of Taiwan and Their Parametersmentioning

confidence: 99%

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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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Section: Discussionmentioning

confidence: 99%

Section: Seismogenic Structures Of Taiwan and Their Parametersmentioning

confidence: 99%

Section: Seismogenic Structures Of Taiwan and Their Parametersmentioning

confidence: 99%

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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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“…1(a)). During the past decades, scientists have carried out a variety of quantitative and qualitative analyses to better understand the processes of the plate suture zone in this arc-continent collision (Hsu, 1962;Barrier et al, 1982;Ho, 1986;Yu and Liu, 1989;Yu et al, 1992;Lee and Angelier, 1993;Angelier et al, 1997;Lee et al, 1998;Hu et al, 2001;Yu and Kuo, 2001;Shyu et al, 2008). Efforts from previous studies indicated a rapid shortening of about 30 mm/year in the middle and southern segments of the Longitudinal Valley Fault (LVF), which is the major fault of the plate suture in the valley (Yu et al, 1992;Yu and Kuo, 2001;Lee et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

Coseismic displacements and slip distribution from GPS and leveling observations for the 2006 Peinan earthquake (Mw 6.1) in southeastern Taiwan

et al. 2009

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Since 2001, we have set up a dense geodetic network with 52 campaign-mode GPS sites and seven continuously recording GPS stations as well as six leveling routes in the Taitung area, Taiwan. Our aim was to better characterize near-fault crustal deformation of active faults at the plate suture of the Philippine Sea plate and Eurasia in southeastern Taiwan. On 1 April 2006, a moderate shallow earthquake (M w 6.1, depth 10.8 km) occurred within this network. This earthquake resulted from rupturing of a geologically unknown or suspected fault (called the Y fault) located underneath the eastern margin of the Central Range. After removing the impacts of secular motions and postseismic slip, we estimated the coseismic displacements of the Peinan earthquake from the GPS and leveling measurements before and after the main shock. Three deformation types with distinct slip behaviors were revealed in three different regions: (1) near the epicenter-around 45 mm movement in the S-SSW direction with +20 to −20 mm vertical motion, in the northern part of the Y fault; (2) south of the epicenter across the southern part of the Y fault-approximately 35 mm in a westward movement with −60 mm subsidence (footwall side) and 40 mm in a SSW movement with at least 50 mm uplift (hanging-wall side), in the southern part of the Y fault; (3) northeast away from the epicenter-about 10 mm in a northward displacement with +15 to −10 mm vertical motions, in the Longitudinal Valley and on the western flank of the Coastal Range. This unique coseismic deformation pattern sheds new light on the characteristics of the suture zone between the Eurasian and Philippine Sea plates at the southernmost Longitudinal Valley. We used GPS and leveling measurements to invert for the fault geometry and the coseismic slip distribution. The optimal modeled fault is an 80• west-dipping fault at a depth of 0.5-20 km. The highest slip of about 0.33 m is located to the south of the hypocenter at a depth of 9-16 km. The total geodetic moment in our optimal model is 2.3 × 10 18 Nt-m, which is equivalent to an earthquake of M w 6.2. The surface coseismic displacements as well as the inferred coseismic slip distribution indicate a drastic change of slip behaviors in the middle of the Y fault. The left-lateral slippage near the hypocenter turned dramatically to reverse faulting with left-lateral component as rupturing propagated to the southern portion of the fault, suggesting that a possible right-lateral faulting occurred that coseismically cross cut the northern middle Peinanshan massif in the Longitudinal Valley.

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“…In the study area of the southernmost Longitudinal Valley, along the Luyeh River there exist several (5 -7) levels of Holocene river terraces (Shyu et al 2002). The uppermost two terraces are the laterite gravels layers, which are widely distributed in the highlands of the Peinan tableland and the Kaotai tableland with a 14 C age of about 3500 yr (Shyu et al 2008). The heights of these Holocene young terraces are up to 70 m with respect to the present Luyeh riverbed, indicating a rigorous tectonic and erosion activity (i.e., a combining rate of 2 cm yr -1 for terrace uplift and river incision) in the study area.…”

Section: Introductionmentioning

confidence: 99%

A New Velocity Field from a Dense GPS Array in the Southernmost Longitudinal Valley, Southeastern Taiwan

Chen¹,

Lee²,

Tung³

et al. 2013

Terr. Atmos. Ocean. Sci.

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In the southernmost Longitudinal Valley (LV), Taiwan, we analyzed a dense GPS array composed of 10 continuous stations and 86 campaign-mode stations. By removing the effects of the four major earthquakes (one regional and three local) occurred during the 1992 -2010 observation period, we derived a new horizontal velocity field in this area, which then allows better locating the surface traces of the major active faults, including the Longitudinal Valley Fault (LVF) system and the Central Range Fault, and characterizing the slip behaviors along the faults. Note that LVF reveals two sub-parallel strands in the study area: the Luyeh Fault to the west and the Lichi Fault to the east. Based on the results of strain analyses, including dilatation and shear strain, and projected vectors of station velocities across the major faults, we came to the following geological interpretations. During the inter-seismic periods, the surface deformation of the southernmost LV is mainly accommodated by the faulting on the two branches of the LVF; there is very little surface deformation on the Central Range Fault.The Luyeh River appears to act as a boundary to divide the LVF to behave differently to its northern and southern sides. The Lichi Fault reveals a change of slip kinematics from an oblique shearing/thrusting in the north to a nearly pure shearing with minor extension to the south. Regarding the slip behavior of the Luyeh Fault, it exhibits a creeping behavior in the north and a partially near-surface-locked faulting behavior in the south. We interpret that the two strands of the LVF merge together in the northern Taitung alluvial plain and turns to E-W trend toward the offshore area.

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Geomorphology of the southernmost Longitudinal Valley fault: Implications for evolution of the active suture of eastern Taiwan

Cited by 42 publications

References 24 publications

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

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

Coseismic displacements and slip distribution from GPS and leveling observations for the 2006 Peinan earthquake (Mw 6.1) in southeastern Taiwan

A New Velocity Field from a Dense GPS Array in the Southernmost Longitudinal Valley, Southeastern Taiwan

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