Chuang, Ray Y









Chuang, Ray Y.

Assistant Professor 


Office : Room 303, Department of Geography

Email : This email address is being protected from spambots. You need JavaScript enabled to view it.

Phone : +886-2-33665833

Laboratory:Surface and Crustal Dynamics Lab

I received my Ph.D. at the Department of Geological Sciences, Indiana University with a major in Geophysics and a minor in mathematics. Before that, I got my M.S. in Geology at Central Washington University. With the passage of my career, I have been working on topics related to surface processes, tectonic geomorphology, active tectonics, and crustal deformation by integrating multiple techniques in geodesy and geoinformatics.
Our group currently focuses on three major directions: (1) Monitoring of topographic evolution; (2) Integrating and applications of multiple techniques in geodesy and geoinformatics; (3) Evaluation of natural hazards and applications of hazard mitigation.
In the processes of topographic evolution and mountain building, two fundamental factors are deformation/movement associated with tectonic activities (endogenic forces) and erosion/landslides influenced by climate (exogenic forces). For the endogenic forces, we mainly combine high-precision GNSS and InSAR techniques to monitor surface displacement and deformation such as coseismic and postseismic deformation of major earthquakes. We then construct numerical models based on continuum mechanics and inverse theory to study mechanisms of crustal deformation. On the other hand, we use UAV, digital camera, and other terrestrial and satellite geodetic methods to observe topographic changes like large-scale landslides, fluvial channel migration, and mud volcanic eruptions. Since modern geomorphological studies are dynamic monitoring and analyses of processes rather than morphological description, we focus on topographic evolution due to the competition and feedback between tectonics and erosion.
Because we are using different techniques in geodesy and geoinformatics, in addition to surface monitoring, we are interested in how to combine multiple data sets, even to integrate techniques like panorama and virtual reality, for other applications. Moreover, surface monitoring data are in the form of time series so we are also interested in how to extract useful information from time series and to develop spatiotemporal analysis based on time series data.
For applications of surface monitoring and surface processes, we pay attention to topics related to natural hazards. One topic is inferring the characteristics of hazards such as estimating seismic potential and scenarios and evaluating properties of landslides. Other topics could be associated with hazard mitigation like forecasting earthquake-triggered landslides and social impacts due to natural hazards.
Our main study area is Taiwan and other study areas are U.S., Japan, Mainland China and Southeast Asia. International collaborations include several schools in U.S., NASA, USGS, schools in Japan (University of Tokyo, Kyoto University, Hokkaido University, and Nagoya University), GFZ, and EOS.
If you are interested in any part of what we are doing, you are welcome to contact me and join our group!
Research interests: topographic evolution, surface processes, crustal deformation, applications of geodesy and geoinformatics, natural hazards and applications of hazard mitigation, land monitoring

Ph.D., Department of Geological Sciences, Indiana University (2014) M.S., Department of Geological Sciences, Central Washington University (2007) B.S., Department of Geography, National Taiwan University (2001)

自然地理學通論  Introduction to Physical Geography  (與黃倬英、莊振義合授)
普通地質學  Physical Geology
地殼變形原理與觀測  Crustal Deformation
造山帶地形演育  Topographic Evolution in Orogenic Belts
自然地理基本力學原理  Basic Mechanics in Physical Geography  (與莊振義合授)
地表作用與地震地質書報討論  (與徐澔德、王昱合授)
空間資料蒐集方法  Spatial Data Collection Methods
雷達遙測一  Radar Remote Sensing (1)  (跨校合授)
高等野外地質學  Advanced Field Geology  (與徐澔德合授)
高等自然地理調查方法  Advance Investigation Methods in Physical Geography (英語授課)
自然地理專題與海外實習  Special Topics and Research in Physical Geography (英語授課)
世界地理海外實習  World Geography Overseas Fieldwork (英語授課)
自組無人機原理與操作 Maing your own UAVs: principles and practice

Refereed Articles:

Chuang, R. Y.*, Lu, C. H., Yang, C. J., Lin, Y. S., and Lee, T. Y. (2020) Coseismic uplift of the 1999 Mw 7.6 Chi-Chi earthquake and implication to topographic change in frontal mountain belts, Geophysical Research Letters, 47(15), e2020GL88947,
Chen, K. H., Chuang, R. Y.*, and Ching, K. E. (2020) Realization approach of non-linear postseismic deformation model for Taiwan semi-kinematic reference frame, Earth, Planets and Space, 72(1),
Hsu, Y. F., Huang, H. H., Huang, M. H., Tsai, V. C., Chuang, R. Y., Feng, K. F., and Lin, S. H. (2020) Evidence for fluid migration during the 2016 Meinong, Taiwan, aftershock sequence, Journal of Geophysical Research,
Lu, C. H., Lin, Y. S., and Chuang, R. Y.* (2020) Pixel offset fusion of SAR and optical images for 3-D coseismic surface deformation, IEEE Geoscience and Remote Sensing Letters,
Lin, Y. S., Chuang, R. Y.*, Yen, J. Y., Chen, Y. C., Kuo, Y. T., Wu, B. L., Huang, S. Y, and Yang, C. J. (2019) Mapping surface breakages of the 2018 Hualien earthquake by using UAS photogrammetry, Terrestrial, Atmospheric, and Oceanic Sciences, 30, 351-366,
Huang, S. Y., Yen, J. Y., Wu, B. L., Yen, I. C., and Chuang, R. Y. (2019) The coseismic surface rupture zone of the 2018 Hualien earthquake, Taiwan: Revisit the trace of Milun fault, Terrestrial, Atmospheric, and Oceanic Sciences, 30, 311-335,
Kuo, Y. T., Wang, Y., Hollinsworth, J., Huang, S. Y., Chuang, R. Y., Lu, C. H., Hsu, Y. C., Tung, H., Yen, J. Y., and Chang, C. P. (2018) Shallow fault rupture of the Milun Fault in the 2018 Mw 6.4 Hualien earthquake: A high resolution approach from optical correlation of Pleiades satellite imagery, Seismological Research Letters, 90(1), 97-107,
Yen, J. Y., Lu, C. H., Dorsey, R. J., Kuo-Chen, H., Chang, C. P., Wang, C. C., Chuang, R. Y., Kuo, Y. T., Chiu, C. Y., Chang, Y. H., Bovenga, F., and Chang, W. Y. (2018) Insights into seismogenic deformation during the 2018 Hualien, Taiwan, earthquake sequence from InSAR, GPS, and modeling, Seismological Research Letters, 90(1), 78-87,
Lu, C. H., Ni, C. F., Chang, C. P., Yen, J. Y., and Chuang, R. Y. (2018) Coherence difference analysis of Sentinel-1 SAR interferogram to identify earthquake-induced disasters in urban areas, Remote Sensing, 10(8), 1318,
Carlson, G., Johnson, K., Chuang, R. Y., and Rupp, J. (2018) Spatially varying stress state in the central U.S. from Bayesian inversion of focal mechanism and in situ maximum horizontal stress orientation data, Journal of Geophysical Research, 123(5), 3871-3890,
Kuo, Y.T., Ku, C.S., Chen, Y.G., Wang, Y., Lin, Y.N.N., Chuang, R.Y., Hsu, Y.J., Taylor, F.W., Huang, B.S., and Tung, H. (2017) Characteristics on fault coupling along the Solomon megathrust based on GPS observations from 2011 to 2014, Geophysical Research Letters,
Chuang, R.Y., Johnson, K.M., Kuo, Y.T., Wu, Y.M., Chang, C.H., and Kuo, L.C. (2014) Active back thrust in the eastern Taiwan suture revealed by the 2013 Rueisuei earthquake: evidence for a doubly-vergent orogenic wedge? Geophysical Research Letters, 41, 3464‒3470,
Chuang, R.Y.*, Johnson, K.M., Wu, Y.M., Ching, K.E., and Kuo, L.C. (2013) A midcrustal ramp-fault structure beneath the Taiwan tectonic wedge illuminated by the 2013 Nantou earthquake series, Geophysical Research Letters, 40, 1‒5,
Yang, Y.R., Johnson, K.M., and Chuang, R.Y. (2013) Inversion for absolute deviatoric crustal stress using focal mechanisms and coseismic stress changes: The 2011 M9 Tohoku-oki, Japan, earthquake, Journal of Geophysical Research, 118, 5516‒5529,
Chuang, R.Y.*, Miller, M.M., Chen, Y.G., Chen, H.Y., Shyu, J.B.H., Yu, S.B., Rubin, C.M., Sieh, K., and Chung, L.H. (2012) Interseismic deformation and earthquake hazard along the southernmost Longitudinal Valley fault, eastern Taiwan, Bulletin of Seismological Society of American, 102(4), 1569‒1582,
Chuang, R.Y.* and Johnson, K.M. (2011) Reconciling geologic and geodetic model fault slip-rate discrepancies in southern California: Consideration of nonsteady mantle flow and lower crustal fault creep, Geology, 39(7), 627‒630,
Ching, K.E., Johnson, K.M., Rau, R.J., Chuang, R.Y., Kuo, L.C., and Leu, P.L. (2011) Inferred fault geometry and slip distribution of the 2010 Jiashian, Taiwan, earthquake is consistent with a thick-skinned deformation model, Earth and Planetary Science Letters, 31, 78‒86,
Shyu, J.B.H., Sieh, K., Chen, Y.G., Chuang, R.Y., Wang, Y., and Chung, L.H. (2008) Geomorphology of the southernmost Longitudinal Valley fault: Implications for evolution of the active suture of eastern Taiwan, Tectonics, 27, TC1019,

Honorary Mention, Earthscope National Meeting, Boise, ID, 2009
Most Outstanding Student Poster Award, Crossroads Conference, Bloomington, IN, 2009
Chevron Fellowship, Indiana University, 2008-09
Most Outstanding Student Paper Award, American Geophysical Union, San Francisco, CA, 2006
Chunghwa Post Scholarship, 2004
Most Outstanding Student Paper Award, Geological Society of China Annual Meeting, Taipei, Taiwan, 2002
Chang, Wei-Jen Scholarship, Department of Geography, National Taiwan University, 2001
The President’s Award, Department of Geography, National Taiwan University, 2000, 2001