Research Topics

Seismic velocity structures in the Taiwan orogen

 

  1. Seismic velocity structures from the independent data sets of the TAIGER and other projects (over 2,500 temporary seismic stations used in the study)
  2. Tomographic Inversion with the data of the active- and passive- sources to better constrain the shallow structure.
  3. Two crustal roots observed beneath the Central and Coastal Ranges due to the collision between the two plates.

References:

1. Kuo-Chen, H., F. T. Wu, and S. W. Roecker (2012) Three-Dimensional P Velocity Structures of the Lithosphere Beneath Taiwan from the Analysis of TAIGER and Related Seismic Data sets, JGR, doi: 10.1029/2011JB009108. (Cited: 28)

2. Wu, F. T., and H. Kuo-Chen, K. McIntosh (2014) Subsurface imaging, TAIGER experiments and tectonic models of Taiwan, J. Asian Earth Sci., doi: 10.1016/j.jseaes.2014.03.024. (Review paper) (Cited: 5)

Seismic velocity Model:
http://ds.iris.edu/ds/products/emc-taiwantttkwr2012/
http://sgylab.earth.ncu.edu.tw/test/v3a.html

 

 

 

Physical properties of the upper crust in the Central Range of Taiwan

 

  1. Felsic crust in the Central Range based on Vp/Vs tomography
  2. Hot and dry continental crust beneath the Central Range
  3. Geothermal gradient ~ 30°C/km beneath the Central Range

References:

Kuo-Chen, H., F. Wu, D.M. Jenkins, J. Mechie, S. Roecker, C.-Y. Wang, and B.-S.Huang (2012) Seismic evidence for the α-β quartz transition beneath Taiwan from Vp/Vs tomography, Geophys. Res. Lett., doi: 10.1029/2012GL053649. (Cited: 5)

 

 

Seismic anisotropy in the upper crust from active source experiment

 

  1. Seismic anisotropy obtained from active source experiment
  2. Two anisotropic patterns in the Central Range. In the northern part, fast direction 42° with 9.7% anisotropy. In the southern part: fast direction 18° with 5.8% anisotropy.
  3. The deformation of the upper crust in the Central Range in northern part higher than that in the southern part.

References:

Kuo-Chen, H., P. Sroda, F. T. Wu, C.-Y. Wang, Y.W. Kuo (2013) Seismic anisotropy of the upper crust in the mountain ranges of Taiwan from the TAIGER explosion experiment, Terrestrial, Atmospheric and Oceanic Sciences, 24, 6, 963-970, doi: 10.3319/TAO.2013.07.30.01(T). (Cited: 1)

 

 

Three-dimensional Vp, Vs, and Vp/Vs seismic velocity structures in the Wuyi-Yunkai orogen

 

  1. Tomographic Inversion with the data of the active- and passive- sources to better constrain the shallow structure.
  2. Low Vp/Vs ratios of the crust in most of Fujian area suggest the felsic crust.
  3. The shallower crust along the coastline results in high heat flow.

References:

Cai, H.-T., H. Kuo-Chen *, X. Jin, C.-Y. Wang, B.-S. Huang, H.-Y. Yen (2015) A three-dimensional Vp, Vs and Vp/Vs crustal structure in Fujian, Southeast China, from active and passive source experiments, J. Asian Earth Sci., doi: 10.1016/j.jseaes.2015.06.014 . (Cited: 1)

 

 

 

Monitoring micro-earthquakes in active faults from dense seismic arrays

 

  1. Microearthquakes were recorded by a dense seismic array near the Lishan fault of Taiwan.
  2. The Lishan fault is a high-angle left-lateral structure based on seismicity and focal mechanisms.
  3. The Lishan fault is an active structure from the surface to about 35 km.

References:

Kuo-Chen, H., F. Wu, W.-L. Chang, C.-Y. Chang, C.-Y. Cheng, N. Hirata (2015) Is the Lishan Fault of Taiwan Active?, Tectonophysics, doi: 10.1016/j.tecto.2015.09.002.

 

 

 

Reflected and refracted seismic profiles in Taiwan and southeastern China

 

  1. Crustal structures are imaged by active-source experiments.
  2. We used both refracted and reflected phases to model the crustal structures.
  3. The crustal evolution involved the closed rift basin in Fujian and Taiwan orogen.

References:

Kuo, Y.W., C.Y. Wang, H. Kuo-Chen *, X. Jin, H.T. Cai, J.Y. Lin, F.T. Wu, H.Y. Yen, B.S. Huang, W.T. Liang, D. Okaya, and L. Brown (2015)  Crustal structures from the Wuyi-Yunkai orogen to the Taiwan orogen: the onshore-offshore wide-angle seismic experiments of the TAIGER and ATSEE projects, Tectonophysics, doi: 10.1016/j.tecto.2015.09.014.