A model for the termination of the Ryukyu subduction zone against Taiwan: A junction of collision, subduction/separation, and subduction boundaries

Wu, Francis T.; Liang, Wen‐Tzong; Lee, Jian‐Cheng; Benz, H.; Villaseñor, Antonio

doi:10.1029/2008jb005950

Cited by 53 publications

(70 citation statements)

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“…The transition from subduction along the Ryukyu arc to collision in Taiwan has been extensively studied with a variety of data sets and methods, including geomorphologic/geophysical observations and numerical/physical modeling [e.g., Chiao et al , 2001; Chou et al , 2006; Font and Lallemand , 2009; Hsu et al , 1996; Hsu , 2001; Hu et al , 2002; Kao et al , 1998b; Lallemand et al , 1999; Shyu et al , 2005; F. T. Wu et al , 2009]. Our results of crustal stress inversion provide further detail by delineating the triangular RTST with well‐defined stress boundaries (Figure 7).…”

Section: Discussionmentioning

confidence: 64%

“…On the basis of background seismicity and 3‐D velocity structures, F. T. Wu et al [2009] proposed that the surface trace of the PSP's western boundary (i.e., the Ryukyu trench) extends along the 23.7°N latitude westward to intersect the Longitudinal Valley fault in eastern Taiwan (LVF) (Figure 7). This location is about two grid points south of the stress boundary identified from our observations.…”

Section: Discussionmentioning

confidence: 99%

“…It is important to realize that the difference may not necessarily imply a contradiction because the two boundaries are defined by different physics. The stress boundary is intrinsically linked to the dynamic response of the plate system, whereas the boundary proposed by F. T. Wu et al [2009] may represent the rheological difference between the two plates.…”

Section: Discussionmentioning

confidence: 99%

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Spatial variation of the crustal stress field along the Ryukyu‐Taiwan‐Luzon convergent boundary

Kao

Hsu

et al. 2010

J. Geophys. Res.

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[1] We applied an improved stress inversion method to a comprehensive data set of earthquake focal mechanisms to depict the pattern of crustal stress along the western convergent boundary of the Philippine Sea plate. Our results indicate that the crustal stress along the Ryukyu fore arc is segmented with boundaries at or near the places of seamount subduction, including the Tokara channel. An extensional stress regime is observed along the entire Ryukyu back arc, implying that back-arc rifting may have extended northward to Kyushu. A triangular area near the southernmost terminus of the Ryukyu arc is characterized by a unique stress signature. The eastern boundary of this Ryukyu-Taiwan Stress Transition coincides with the 123°E meridian where the Gagua ridge intercepts the Ryukyu trench; whereas its western boundary agrees remarkably well with the border between the postcollision and waning-collision domains in northern Taiwan. The Taiwan collision zone is dominated by compression that rotates locally according to the structural configuration of the Lukang Magnetization High (LMH), suggesting that the LMH may be critical in controlling the local stress distribution. The stress signature of the Luzon arc-Taiwan collision reaches as far south as 19.5°N. The tectonic stress along the Manila trench-Luzon fore arc is dominated by a complex regime of extension that cannot be explained by simple plate bending or in-slab membrane stress. Since this extensional regime is observed only south of ∼22°N, it probably marks the northern limit of the contemporary boundary between the subduction along the Manila trench and the collision in Taiwan.

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Section: Discussionmentioning

confidence: 64%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Spatial variation of the crustal stress field along the Ryukyu‐Taiwan‐Luzon convergent boundary

Kao

Hsu

et al. 2010

J. Geophys. Res.

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“…A cluster of 20-to 25-km-deep earthquakes appears to wrap around the leading edge of the promontory (Wu et al, 2009), possibly highlighting the collision of the promontory with duplexes beneath the Hsüehshan Range. We suggest that as the promontory became involved in crustal shortening, the continental margin fracture zone reactivated as a left-lateral transfer fault, which is presently illuminated by earthquakes within the Sanyi-Puli seismic zone.…”

Section: Tectonic Model Of Central Taiwanmentioning

confidence: 95%

Tectonic implications of nonparallel topographic and structural curvature in the higher elevations of an active collision zone, Taiwan

Mirakian¹,

Crespi²,

Byrne³

et al. 2013

Lithosphere

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Curves in the topographic grain of active orogenic belts typically parallel faults and lithologic contacts in part because of linkages between uplift rates and the structural development of the overriding plate. However, in the Taiwan collision zone, the topographic grain trends nonparallel to mapped faults and folds in the central portion of the belt along the southwest fl ank of the Hsüehshan Range. Here, the northern side of the Puli topographic embayment trends ~345°, forming a topographic break that lies at a high angle to the structural grain but is nearly parallel to an underlying continental margin fracture zone in the downgoing plate. We analyzed fault-slip and other structural data, extracted normalized steepness indices from streams within the Tachia, Peikang, and Mei River basins, and integrated the results with recently published precise leveling data in order to understand the spatial and temporal variation in uplift and the structures that accommodated that uplift. Stress inversion reveals a NW-SE-trending maximum compression direction for an early-stage fault population and an ENE-WSW-trending maximum compression direction for a late-stage fault population. River steepness indices delineate a NW-trending boundary in incision rate that coincides with an increase in rock uplift rates derived from independent geodetic measurements. This NWtrending boundary is consistent with the late-stage maximum compression direction, suggesting that uplift of the Hsüehshan Range relative to the Puli topographic embayment has been accommodated by the late-stage faults. Our results suggest that a continental margin promontory has slowed underplating beneath the Puli topographic embayment and that the topographic grain of active collision zones is closely linked with the architecture of the downgoing plate.

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“…By itself, 3-D passive seismic tomography across Taiwan using traditional TAIGER broadband data and the islandwide earthquake monitoring network is not able to resolve the upper crust (0-5 kilometers) because those seismic waves sample the Earth only near stations and the stations are 5-20 kilometers apart [Wu et al, 2009]. The addition of the engineered explosion arrival times into the 3-D passive tomography improves the depiction of the shallow crust along the profile, as illustrated in the presence of a slowvelocity sedimentary basin under western Taiwan, as well as an improved understanding of velocity structure beneath the Central Ranges (Figure 1c).…”

Section: A More Complete Picturementioning

confidence: 99%

Joint Passive/Controlled Source Seismic Experiment Across Taiwan

Okaya

Wang

et al. 2009

EoS Transactions

Self Cite

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Scientists who study Earth structures and interactions at tectonic plate boundaries illuminate the three‐dimensional (3‐D) subsurface primarily through passive or active source seismic studies. In passive source studies, natural earthquakes are observed through arrays of seismic stations, allowing seismologists to image structures at depth and infer physical properties of the Earth. In active (controlled) source studies, scientists provide an artificial seismic source to be recorded by seismic networks, allowing more detailed views of fine‐scale structures buried within plate boundaries. The use of “continuous” modes on large‐storage‐capacity seismic recording systems enables seismologists to blur traditional lines between active and passive source seismology in regions of high earthquake activity. In addition to generating seismograms from controlled sources, a deployed dense array can record local and teleseismic earthquakes with exceptionally coherent signals across its aperture. As a result of such joint recording, the scientific value of the collected data increases. Moreover, whether or not the seismic sources are natural or engineered becomes less of a factor for data storage, sorting, and analysis methods. Local earthquakes can supplement controlled sources, multichannel processing and imaging methods traditionally used in active seismic studies become amenable to dense sets of passive source data, and active source data with known source origin times and locations are easily incorporated into regional seismic 3‐D tomography and earthquake location studies.

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A model for the termination of the Ryukyu subduction zone against Taiwan: A junction of collision, subduction/separation, and subduction boundaries

Cited by 53 publications

References 50 publications

Spatial variation of the crustal stress field along the Ryukyu‐Taiwan‐Luzon convergent boundary

Spatial variation of the crustal stress field along the Ryukyu‐Taiwan‐Luzon convergent boundary

Tectonic implications of nonparallel topographic and structural curvature in the higher elevations of an active collision zone, Taiwan

Joint Passive/Controlled Source Seismic Experiment Across Taiwan

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