Crustal structure of the convergent plate-boundary zone, eastern Taiwan, assessed by seismic tomography

Cheng, Win-Bin; Wang, Chengsung; Shyu, Chuen-Tien; Shin, Tzay‐Chyn

doi:10.1130/0-8137-2358-2.161

Cited by 15 publications

(24 citation statements)

References 38 publications

(43 reference statements)

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“…The subducted Philippine Sea slab is broken off at 250km depth and it results in the mantle upwelling at the base of continental lithosphere. Previous tomography works in the Taiwan areas also revealed the subduction of the Philippine Sea plate and it appears as a NNW-dipping high velocity zone between 20∼50km and 100∼130km, which is consistent with a north-dipping seismic zone [11,36] . Nevertheless, there was no clear evidence from seismic tomography showing an eastward subduction of the Eurasian continent lithosphere in southern Taiwan.…”

Section: East China Sea and Taiwansupporting

confidence: 77%

P Wave Velocity Structure and Tectonics Analysis of Lithospheric Mantle in Eastern China Seas and Adjacent Regions

Xu¹,

Liu²,

Hao³

et al. 2006

Chinese J of Geophysics

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Using earthquake data recorded by seismic stations in the eastern China and Taiwan areas, Japan and Ryukyu Arcs, we reconstructed the P wave velocity structure of the eastern China seas and adjacent areas through a seismic tomography inversion. By analyzing the properties of lithosphere mantle and deep dynamic conditions in these regions, we discussed the locations of the boundaries between the Sino-Korea, Yangtze and South China blocks. They revealed the effects of the collision of Philippine Sea plate with Eurasian continent, slab subduction, and back-arc extension on the lithosphere structure of the eastern China seas. The results also revealed a strong lateral heterogeneity of the lithosphere mantle in the eastern China seas and it has a certain relation with regional tectonics. The Wulian-Qingdao fault zone, the west-margin fault zone of Korea Peninsula and the south-margin fault zone of the Cheju Island jointly construct the boundary between the Sino-Korea and Yangtze blocks. Extending to the south end of the Korea peninsula, the Jiangshao fault zone appears as the boundary to separate the Yangtze and South China blocks. A clear difference in lithosphere structure exists for the continental shelf of the East China Sea and the Okinawa Trough. The former is similar to that in eastern China, belonging to an extension of the Eurasian continent; whereas the latter is a continent-ocean transition zone with a strongly thinned lithosphere. Along the Ryukyu-Taiwan subduction zone, the sinking of the Philippine Sea plate has a great effect on the upper mantle structures of the eastern China seas, while the interaction between the Eurasian continent and the Philippine Sea plate is a major reason for the thickening of the lithosphere of Taiwan area.

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Section: East China Sea and Taiwansupporting

confidence: 77%

P Wave Velocity Structure and Tectonics Analysis of Lithospheric Mantle in Eastern China Seas and Adjacent Regions

Xu¹,

Liu²,

Hao³

et al. 2006

Chinese J of Geophysics

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“…In contrast, the two portable seismic stations along the extension of the shooting line can record the airgun signals of more than 100 km. Similar situation is also seen in the TAICRUST experiment of Taiwan, where the farthest signals recorded by permanent seismic stations are 80 km in southern Taiwan [19,20] , and only 40 km in northeast Taiwan [21] . There were many permanent seismic stations on Taiwan Island but only a few of them recorded the airgun signals at short distances.…”

Section: Discussionsupporting

confidence: 64%

The application of large volume airgun sources to the onshore-offshore seismic surveys: implication of the experimental results in northern South China Sea

et al. 2007

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Onshore-offshore seismic experiments were carried out for the first time in northern South China Sea using large volume airgun sources at sea and seismic stations on land. The experimental results indicate that seismic signals from the new airgun array of R/V Shiyan 2 can be detected as far as 255 km. The signal effective area reaches nearly 50000 km 2 , which covers Hong Kong and Pearl River Delta. Compared with the old airgun array, the signal amplitude, propagation distance and effective area of the new airgun array have been increased notably, which demonstrates that the upgrade of the airgun source was successful. Comparisons with previous experimental results in other regions show that the shooting effect of the new airgun array is similar to those best airgun sources in the world. Especially, it is a new breakthrough in using the permanent seismic stations onshore to record long distance airgun signals offshore, which has great significance to the realization of the "seismic radar" concept and the 3D seismic surveys of crustal structure in coastal areas.airgun source, seismic station, onshore-offshore seismic survey, crustal structure, northern South China SeaThe earliest marine artificial seismic sources were simply a copy of the explosive sources on land, but it was soon discovered that the explosive sources had many disadvantages when underwater was used, e.g., difficult to operate, dangerous to handle, unable to auto-work continuously, and severe pollution to the environment. Especially because of the harmful effects on fishes and marine mammals, it is forbidden by law to use explosives in many international waters. Afterwards many marine sources have been invented and tested. Among them, the airgun has far surpassed the others in popularity. Its principle is to release suddenly high pressure air into water and produce seismic waves like small explosives. The airgun sources in early stage used only a single airgun and their output energy was small. Later on, airgun array sources were developed which consisted of many airguns. By careful designing, the primary pulse of airguns was enhanced and the bubble pulse was suppressed. Therefore, the airgun array was widely used in marine seismic surveys and occupied gradually the dominant position. Now, 95% of the marine seismic sources are airgun array sources [1] . OCEANOLOGYMost marine seismic surveys are MCS surveys to explore the detailed structure of sedimentary layers in oil-and-gas basins. Fewer are the wide angle reflection

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“…[] and Wu et al . [] indicate that the crust beneath the Longitudinal Valley is approximately 40 km thick, but other seismic tomography studies [ Cheng et al ., ; Kuo‐Chen et al ., ; Lallemand et al ., ] found mantle P wave seismic velocities (>7.5 km/s) here at depths of 25 to 30 km (Figure ). Kuo‐Chen et al .…”

Section: Discussionmentioning

confidence: 94%

Deep crustal structure of an arc‐continent collision: Constraints from seismic traveltimes in central Taiwan and the Philippine Sea

et al. 2014

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The collision of continental crust of the Eurasian Plate with the overriding Luzon Arc in centralTaiwan has led to compression, uplift, and exhumation of rocks that were originally part of the Chinese rifted margin. Though the kinematics of the fold-thrust belt on the west side of the orogen has been described in detail, the style of deformation in the lower crust beneath Taiwan is still not well understood. In addition, the fate of the Luzon Arc and Forearc in the collision is also not clear. Compressional wave arrival times from active-source and earthquake seismic data from the Taiwan Integrated Geodynamic Research program constrain the seismic velocity structure of the lithosphere along transect T5, an east-west corridor in central Taiwan. The results of our analysis indicate that the continental crust of the Eurasian margin forms a broad crustal root beneath central Taiwan, possibly with a thickness of 55 km. Compressional seismic velocities beneath the Central Range of Taiwan are as low as 5.5 km/s at 25 km depth, whereas P wave seismic velocities in the middle crust on the eastern flank of the Taiwan mountain belt average 6.5-7.0 km/s. This suggests that the incoming sediments and upper crust of the Eurasian Plate are buried to midcrustal depth in the western flank of the orogen before they are exhumed in the Central Range. To the east, the Luzon Arc and Forearc are deformed beneath the Coastal Range of central Taiwan. Fragments of the rifted margin of the South China Sea that were accreted in the early stages of the collision form a new backstop that controls the exhumation of Eurasian strata to the west in this evolving mountain belt.

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Crustal structure of the convergent plate-boundary zone, eastern Taiwan, assessed by seismic tomography

Cited by 15 publications

References 38 publications

P Wave Velocity Structure and Tectonics Analysis of Lithospheric Mantle in Eastern China Seas and Adjacent Regions

P Wave Velocity Structure and Tectonics Analysis of Lithospheric Mantle in Eastern China Seas and Adjacent Regions

The application of large volume airgun sources to the onshore-offshore seismic surveys: implication of the experimental results in northern South China Sea

Deep crustal structure of an arc‐continent collision: Constraints from seismic traveltimes in central Taiwan and the Philippine Sea

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