WEI Shengji

Principal Investigator

Assistant Professor, Asian School of the Environment

Phone:

(+65) 6592 7743

Fax:

+(65) 6790 1585

Email:

shjwei@ntu.edu.sg

Office Location:

N2-01A-08

Research Group:

Tectonics

Team:

Observational Seismology - Wei Shengji

Research:

My research interests are mainly focused on earthquake source studies both in real time and later in-depth research. Recently, I have also become interested in slab structures and their impact on source studies. Besides working on seismic waveforms, I also include results from optical and SAR imaging of ground deformation. My research experiences cover both natural and man-made earthquakes. My approach for resolving the kinematic nature of earthquakes involves the combination of geodesy, geology and seismology to better constrain the spatial-temporal evolution of seismic rupture properties. Besides reconciling various datasets, I have developed techniques that allow waveform inversions to be extended to the higher frequency (>1Hz) range of relevance for damage assessment. Path calibrations also allow us to report earthquake source parameters more accurately in real time, and warnings can be issued based on these information.

My research interests are:

Real time seismology
Earthquake focal mechanism inversion
Kinematic finite fault inversion, involving joint constraints from geodetic, seismological, tsunami and field observations
Strong ground motion simulation with 3-dimensional velocity structure and their potential application to earthquake engineering
Crustal to upper mantle scale velocity structure study, aim to establish path calibrations for earthquake studies and image slab structure in the subduction zones

Education:

Mar. 2008 ~ Feb. 2009: Visiting Student, Seismolab at Caltech
Sep. 2004 ~ July 2009, Ph.D., Geophysics, Univ. of Sci. and Tech. of China (USTC)
Sep. 2000 ~ July 2004, B.S., Geophysics, Univ. of Sci. and Tech. of China (USTC)

Professional Experience:

Oct. 2014 ~ now: Assistant Professor,Earth Observatory of Singapore, Nanyang Technological University
Sep. 2009 ~ Oct. 2014: Post-doctoral research fellow, Seismological Laboratory, Caltech
Sep. 2004 ~ July 2009: Research assistant, Department of Geophysics, USTC
Feb. 2006 ~ Feb. 2008: Research assistant, Institute of Geophysics, China Earthquake Administration
2005-2006: Teaching Assistant, Mechanics, University of Science and Technology of China
2009-2013: Teaching Assistant, Advanced Seismology, California Institute of Technology

Professional Activities:

Member of AGU since 2008
Member of the Southern California Earthquake Center
Peer reviewer for journals of BSSA, SRL, GRL, Earthquake Science, Chinese Journal of Geophysics (in Chinese), Tectonophysics

Publications:

Qian, Y., Wei S., Wu W., Zeng H., Coudurier‐Curveur A., & Ni S. (2019). Teleseismic Waveform Complexities Caused by Near Trench Structures and Their Impacts on Earthquake Source Study: Application to the 2015 Illapel Aftershocks (Central Chile). Journal of Geophysical Research-Solid Earth. 124, 870-889.
Liu, S., Suardi I., Yang D., Wei S., & Tong P. (2018). Teleseismic Traveltime Tomography of Northern Sumatra. Geophysical Research Letters. 45, 13231-13239.
Wang, X., Bradley K., Wei S., & Wu W. (2018). Active backstop faults in the Mentawai region of Sumatra, Indonesia, revealed by teleseismic broadband waveform modeling. Earth and Planetary Science Letters. 483, 29-38.
Wang, T., Wei S., Shi X., Qiu Q., Li L., Peng D., et al. (2018). The 2016 Kaikoura earthquake: Simultaneous rupture of the subduction interface and overlying faults. Earth and Planetary Science Letters. 482(44-51),
Wei, S., Chen M., Wang X., Graves R. W., Lindsey E. O., Wang T., et al. (2018). The 2015 Gorkha (Nepal) earthquake sequence: I. Source modeling and deterministic 3D ground shaking. Tectonophysics. 722, 447-461.
Wang, T., Shi Q., Nikkhoo M., Wei S., Barbot S., Dreger D. S., et al. (2018). The rise, collapse, and compaction of Mt. Mantap from the 3 September 2017 North Korean nuclear test. Science.
Shi, Q., Wei S., & Chen M. (2018). An MCMC multiple point sources inversion scheme and its application to the 2016 Kumamoto Mw 6.2 earthquake. Geophysical Journal International. 215(2), 737-752.
Muzli, Umar M., Nugraha A. Dian, Bradley K. Edward, Widiyantoro S., Erbas K., et al. (2018). The 2016 M-w 6.5 Pidie Jaya, Aceh, North Sumatra, Earthquake: Reactivation of an Unidentified Sinistral Fault in a Region of Distributed Deformation. Seismological Research Letters. 89(5), 1761-1772.
Jiao, L., Tapponnier P., Costa F., Donze F-V., Scholtes L., Taisne B., et al. (2018). Necking and fracking may explain stationary seismicity and full degassing in volcanic silicic spine extrusion. Earth and Planetary Science Letters. 503, 47-57.
Wu, W., Ni S., Zhan Z., & Wei S. (2018). An SEM-DSM three-dimensional hybrid method for modelling teleseismic waves with complicated source-side structures. Geophysical Journal International. 215(1), 133-154.
Lai, V H., Graves R. W., Wei S., & Helmberger D. V. (2017). Evidence for strong lateral seismic velocity variation in the lower crust and upper mantle beneath the California margin. Earth and Planetary Science Letters. 463, 202-211.
Wang, Y., Wei S., Wang X., Lindsey E. O., Tongkul F., Tapponnier P., et al. (2017). The 2015 Mw 6.0 Mt. Kinabalu earthquake: an infrequent fault rupture within the Crocker fault system of East Malaysia. Geoscience Letters.
Chu, R., Ko J Y-T., Wei S., Zhan Z., & Helmberger D. V. (2017). Lithospheric radial anisotropy beneath the Gulf of Mexico. Earth and Planetary Science Letters. 466, 43-52.
Moore, J. D. P., Yu H., Tang C-H., Wang T., Barbot S., Peng D., et al. (2017). Imaging the distribution of transient viscosity after the 2016 M-w 7.1 Kumamoto earthquake. Science. 356(6334), 163-167.
Qian, Y., Ni S., Wei S., Almeida R., & Zhang H. (2017). The effects of core-reflected waves on finite fault inversions with teleseismic body wave data. Geophysical Journal International. 211(2), 936-951.
Wang, X., Wei S., & Wu W. (2017). Double-ramp on the Main Himalayan Thrust revealed by broadband waveform modeling of the 2015 Gorkha earthquake sequence. Earth and Planetary Science Letters. 473, 83-93.
Xiong, X., Shan B., Zhou Y M., Wei S., Li Y. D., Wang R., et al. (2017). Coulomb stress transfer and accumulation on the Sagaing Fault, Myanmar, over the past 110 years and its implications for seismic hazard. Geophysical Research Letters. 44(10), 4781-4789.
Hananto, N. D., Qin Y., Leclerc F., Avianto P., Tapponnier P., Carton H., et al. (2017). The discovery of a conjugate system of faults in the Wharton Basin intraplate deformation zone. Science Advances. 3,
Shi, X., Wang Y., Jing L-Z., Weldon, II R. J., Wei S., Wang T., et al. (2017). How complex is the 2016 Mw 7.8 Kaikoura earthquake, South Island, New Zealand?. Science Bulletin. 62, 309-311.
Khairina, F., Chen W., Wei S., Suardi I., Meilano I., & Zulfakriza (2016). Focal Mechanism of the August 18th 2012 Mw6.3 Palu-Koro Earthquake and Its Implication of Seismic Hazard. 6th International Symposium on Earth Hazard and Disaster Mitigation. 1857,
Lui, S. K. Y., Helmberger D. V., Yu J., & Wei S. (2016). Rapid Assessment of Earthquake Source Characteristics. Bulletin of the Seismological Society of America. 106(6), 2490-2499.
Wei, S., Barbot S., Graves R. W., Lienkaemper J. J., Wang T., Hudnut K. W., et al. (2015). The 2014 Mw6.1 South Napa Earthquake: A unilateral rupture with shallow asperity and rapid afterslip. Seismological Research Letters. 86(2A), 344-354.
Avouac, J-P., Meng L., Wei S., Wang T., & Ampuero J-P. (2015). Lower edge of locked Main Himalayan Thrust unzipped by the 2015 Gorkha earthquake. Nature Geoscience.
Wang, T., Wei S., & Jónsson S. (2015). Coseismic displacements from SAR image offsets between different satellite sensors: Application to the 2001 Bhuj (India) earthquake. Geophysical Research Letters. 42(17), 7022-7030.
Wei, S., Avouac J-P., Donnellan A., Parker J. W., Graves R. W., Helmberger D. V., et al. (2015). The 2012 Brawley swarm triggered by injection-induced aseismic slip. Earth And Planetary Science Letters. 422, 115-125.
Zhan, Z., Kanamori H., Tsai V. C., Helmberger D. V., & Wei S. (2014). Rupture complexity of the 1994 Bolivia and 2013 Sea of Okhotsk deep earthquakes. Earth and Planetary Science Letters.
Avouac, J-P., Ayoub F. M., Wei S., Ampuero J-P., Meng L., Leprince S., et al. (2014). Seismic slip boosted on a misoriented fault bend during the 2013, Mw 7.7 Balochistan Earthquake. Earth and Planetary Science Letters.
Wei, S., Helmberger D. V., Owen S. E., Graves R. W., & Fielding E. J. (2013). Complementary slip distributions of the largest earthquakes in the 2012 Brawley swarm, Imperial Valley, California. Geophysical Research Letters. 40, 1-6.

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Wei, S., Helmberger D. V., & Avouac J-P. (2013). Modeling the 2012 Wharton Basin Earthquakes off-Sumatra; Complete Lithospheric Failure. Journal of Geophysical Research Solid Earth. 118, 3592–3609.

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Wei, S., Helmberger D. V., Zhan Z., & Graves R. W. (2013). Rupture complexity of the Mw 8.3 Sea of Okhotsk earthquake: rapid triggering of complementary earthquakes?. Geophysical Research Letters.

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Yu, Z., Ni S D., Wei S., Zeng X., Wu W., & Li Z. (2012). An iterative algorithm for separation of S and ScS waves of great earthquakes. Geophysical Journal International. 91, 591~600.
Wei, S., Zhan Z., Tan Y., Ni S D., & Helmberger D. V. (2012). Locating earthquake with surface waves and centroid moment tensor estimation. Journal of Geophysical Research. 117,

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Wei, S., Graves R. W., Helmberger D. V., Avouac J-P., & Jiang J. (2012). Different rupture sources of shaking and flooding during the Tohoku-Oki Earthquake: a mixture of rupture style. Earth and Planetary Science Letters. 91-100.

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Chu, R., Wei S., Helmberger D. V., & Zhan Z. (2011). Initiation of the great Mw 9.0 Tohoku–Oki earthquake. Earth and Planetary Science Letters.

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Simons, M., Minson S. E., Sladen A., Ortega F., Jiang J., Owen S. E., et al. (2011). The 2011 Magnitude 9.0 Tohoku-Oki Earthquake: Mosaicking the Megathrust from Seconds to Centuries. Science. 332(6063), 1421-1425.
Chen, W., Ni S D., Wei S., Wang Z., & Xie J. (2011). Effects of sedimentary layer on earthquake source modeling from geodetic inversion. Earthquake Science. 24(2), 1674-4519.
Shan, B., Xiong X., Zheng Y., Wei S., Wen Y., Jin B., et al. (2011). The co-seismic Coulomb stress change and expected seismicity rate caused by 14 April 2010 Ms =7.1 Yushu, China, earthquake, 2011. Tectonophysics. 510, 345-353.
Zhan, Z., Wei S., Ni S D., & Helmberger D. V. (2011). Earthquake Centroid Locations Using Calibration from Ambient Seismic Noise. Bulletin of the Seismological Society of America. 10(3), 1438-1445.
Zhan, Z., Jin B., Wei S., & Graves R. W. (2011). Coulomb Stress Change Sensitivity due to Variability in Mainshock Source Models and Receiving Fault Parameters: A Case Study of the 2010-2011 Christchurch, New Zealand, Earthquakes. Seismological Research Letters. 82, 800-814.
Wei, S., Ni S D., Zha X., Wang Z., & Helmberger D. V. (2011). Source model of the 11th July 2004 Zhongba earthquake revealed from the joint inversion of InSAR and seismological data. Earthquake Science. 24(2), 207-220.

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Wei, S., Fielding E. J., Leprince S., Sladen A., Avouac J-P., Helmberger D. V., et al. (2011). Superficial simplicity of the 2010 El Mayor–Cucapah earthquake of Baja California in Mexico. Nature Geoscience.

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Luo, Y., Tan Y., Wei S., Helmberger D. V., Zhan Z., Ni S D., et al. (2010). Source Mechanism and Rupture Directivity of the May 18, 2009 MW 4.6 Inglewood, California, Earthquake. Bulletin of the Seismological Society of America. 100(6), 3269-3277.

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Tan, Y., Song T-R A., Wei S., & Helmberger D. V. (2010). Surface Wave Path Corrections and Source Inversions in Southern California. Bulletin of the Seismological Society of America. 100(6), 2891-2904.
Wei, S., Ni S D., Chong J., Zheng Y., & Chen Y. (2009). The 16 August 2003 Chifeng earthquake: Is it a lower crust earthquake?. Chinese J. Geophys. (in Chinese)`. 52(1), 111-119.

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Zheng, Y., Ma H S., Lü J., Ni S D., Li Y C., & Wei S. (2009). Source mechanism of strong aftershocks (Ms≥5.6) of the 2008/05/12 Wenchuan earthquake and the implication for seismotectonics. Science in China Series D-Earth Sciences. 52(6), 739-753.
Hauksson, E., Felzer K. R., Given D., Giveon M., Hough S. E., Hutton K., et al. (2008). Preliminary Report on the 29 July 2008 Mw 5.4 Chino Hills, Eastern Los Angeles Basin, California, Earthquake Sequence. Seismological Research Letters. 79(6), 855-866.
Materna, K., Wei S., Xin W., Heng L.(, Wang T., Chen W., et al. (0). Source characteristics of the 2017 M(w)6.4 Moijabana, Botswana earthquake, a rare lower-crustal event within an ancient zone of weakness. Earth and Planetary Science Letters. 506, 348-359.

Publications:

Moore, J. D. P., Yu H., Tang C-H., Wang T., Barbot S., Peng D., et al. (2017). Postseismic deformation following the 2015 Mw 7.8 Gorkha earthquake and the distribution of brittle and ductile crustal processes beneath Nepal. European Geosciences Union General Assembly 2017.
Moore, J. D. P., Yu H., Tang C-H., Barbot S., Peng D., Masuti S., et al. (2017). Imaging the distribution of transient viscosity following the 2016 Mw7.1 Kumamoto earthquake. Japan Geoscience Union - American Geophysical Union Joint Meeting 2017.
Salman, R., Hill E. M., Wei S., Lindsey E. O., Bradley K., Muzli, et al. (2017). Analysis of the 2016 Aceh Mw 6.5 strike-slip earthquake using joint inversion of InSAR and tele seismic data. Asia Oceania Geosciences Society 14th Annual Meeting.
Moore, J. D. P., Yu H., Tang C-H., Wang T., Barbot S., Peng D., et al. (2016). Kinematic inversion of postseismic deformation following the 2016 Mw 7.0 Kumamoto earthquake for the distribution of brittle and ductile crustal processes. American Geophysical Union Fall Meeting.
Salman, R., Hill E. M., Feng L., Wei S., Barbot S., Lindsey E. O., et al. (2016). The 2008 Mw 7.2 North Pagai earthquake sequence: Partial rupture of a fully locked Mentawai patch. American Geophysical Union Fall Meeting.
Salman, R., Hill E. M., Feng L., Wei S., Barbot S., Lindsey E. O., et al. (2016). The 2008 Mw 7.2 North Pagai earthquake sequence: Partial rupture of a fully locked Mentawai patch. 6th International Symposium on Earth Hazard and Disaster Mitigation.

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