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Your search keyword '"Hao Kuo-Chen"' showing total 3 results
Start Over Author "Hao Kuo-Chen" Journal geophysical journal international
3 results on '"Hao Kuo-Chen"'

1. Variations in mantle lithosphere buoyancy reveal seismogenic behavior in the Sunda-Andaman subduction zone

Author

Shu Kun Hsu, Wen Nan Wu, Wen Bin Doo, Hsueh Fen Wang, Chung Liang Lo, Hao Kuo-Chen, and Yin Sheng Huang

Subjects
Geophysics, Buoyancy, Subduction, Geochemistry and Petrology, Lithosphere, Seismotectonics, engineering, engineering.material, Petrology, Geology, Mantle (geology)
Abstract

Summary The distribution of historic earthquakes in the Sumatra subduction zone reveals, in the fore-arc region, the intense seismic activity and frequent occurrences of Mw > 8 earthquakes throughout the whole area. In contrast, the neighboring region has less dense seismicity, and no large earthquake greater than Mw8 has been observed in the Java subduction zone. Such different seismic behaviors may be due to distinct degrees of the stress accumulation and release. In this study, the strength of plate coupling inferred from mantle lithosphere buoyancy (Hm) estimation is used to explain the seismogenic behavior in the Sunda-Andaman subduction zone. Strong and weak plate coupling status are obtained in the Sumatra and Java subduction zones, respectively. These results can explain the significant differences in seismogenic behaviors in the Sunda-Andaman subduction zone. In assessing the global implications of this finding, we observe that uplifted serpentinized fore-arc mantle peridotite is the critical phenomenon in weak plate coupling cases and leads to a limit on the width of the coupling zone. Strong plate coupling can cause a relatively low gravity anomaly as well as a negative trench-parallel gravity anomaly (TPGA) in the fore-arc regions and correlates well with the occurrence of large earthquakes, whereas weak plate coupling can cause a positive TPGA and constrain the potential occurrence of large earthquakes.

Published
2019

2. A lithospheric profile across northern Taiwan: from arc-continent collision to extension

Author

Char-Shine Liu, Luc L. Lavier, David Okaya, Hao Kuo-Chen, Chao Shing Lee, Harm J. A. Van Avendonk, Chien Ying Wang, Francis T. Wu, and Kirk D McIntosh

Subjects
010504 meteorology & atmospheric sciences, Geophysics, 010502 geochemistry & geophysics, Collision, 01 natural sciences, Arc (geometry), Extension (metaphysics), Continental margin, Geochemistry and Petrology, Seismic tomography, Lithosphere, Geology, Seismology, 0105 earth and related environmental sciences
Published
2015

3. A lithospheric profile across northern Taiwan: from arc-continent collision to extension.

Author

Van Avendonk, Harm J. A., McIntosh, Kirk D., Hao Kuo-Chen, Lavier, Luc L., Okaya, David A., Wu, Francis T., Chien-Ying Wang, Chao-Shing Lee, and Char-Shine Liu

Subjects
LITHOSPHERE, PLATE tectonics, CONTINENTAL crust, CRUST of the earth, OROGENIC belts, SEISMOLOGICAL research
Abstract

During arc-continent collision, buoyant sections of sediments and rifted continental crust from a subducting plate will accrete to the forearc of the upper plate as long as this backstop remains intact. Deformation of the oceanic arc and forearc block may ultimately lead to accretion of these mafic rock units to the new orogen. The Taiwan mountain belt, which formed at ~6.5 Ma by oblique convergence between the Eurasian passive margin and the overriding Luzon arc in northern Taiwan, offers important insight in this process, since the collision is more advanced in the north than in the south. The incipient stage of arc-collision can be studied in southern Taiwan, while the northern portion of the orogen is presently undergoing collapse due to a flip in the subduction polarity between the Eurasian Plate and the Philippine Sea Plate. In this study, we seismically image the structure of the northern section of the mountain belt with a tomographic inversion. We present marine and land-based seismic refraction data, as well as local earthquake data, from transect T6 of the Taiwan Integrated Geodynamic Research (TAIGER) program across the Taiwan mountain belt and the adjacent Ryukyu arc. Our 2-D compressional seismic velocity model for this transect, which is based on a tomographic inversion of 10 213 P-wave arrival times, shows that the Eurasian crystalline continental crust thickens from ~24 km in the Taiwan Strait to ~40 km beneath the eastern Central Range of Taiwan. The detailed seismic velocity structure of the Taiwan mountain belt shows vertical continuity in the upper 15 km, which suggests that rocks are exhumed to the surface here from the middle crust in a near-vertical path. The continental crust of the westernmost Ryukyu arc is almost as thick (~40 km) as in the adjacent northern Central Range of Taiwan, and it appears to override the leading edge of the Philippine Sea Plate offshore northeastern Taiwan. If we assume that the western Ryukyu arc crust also thickened in the collision, then the mountain belt is wider and less thick in northern Taiwan than in central Taiwan (~50 km), which may be the result of post-collisional extension in the north. [ABSTRACT FROM AUTHOR]

Published
2016
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