People at Fort Hoofddijk

Tao Yang
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Visiting Research Fellow
Dr. T. Yang
Paleomagnetic Laboratory
Fort Hoofddijk
Bucharest University
Department of Earth Sciences, 
Utrecht University 
Budapestlaan 17, 3584 CD Utrecht 
The Netherlands 

Phone +31 613 258 721

Usually at:
Institute of Geophysics
China Earthquake Administration
Daxue South Road, Haidian, Beijing 100081, China

Research of Tao Yang

Rock magnetic records of seismic faulting
Fe-bearing minerals are widely present in fault rocks. During coseismic slip events, frictional heating generated by shear friction with a high slip rate will quickly elevate the temperature within the fault slip zone, and induce thermochemical reactions of Fe-bearing minerals. During inter-seismic periods, fluids infiltrate and percolate into fault zone with relatively low permeability, and may cause dissolution, precipitation and recrystallization of Fe-bearing minerals. All of these effects would leave records in attributes (grain size, concentration and composition) of magnetic minerals in fault rocks. Consequently, rock magnetic studies of fault rocks would provide clues to help understand seismic faulting and history of fault activity.

Fault rocks from the Hole WFSD-1 (Li et al., 2013)

In the last several years, two unprecedented earthquakes hit China and Japan, and caused tremendous damage and loss of lives, respectively. One is the 2008 Wenchuan earthquake (Mw 7.9) in the Longmenshan (LMS) fault zone, located on the tectonic boundary between the Tibetan Plateau and the Sichuan Basin. It was also the largest seismic event in China in the last 50 years. Another one is the 2011 Tohoku-Oki earthquake (Mw 9.0) off the northeast coast of Honshu, which caused the devastating tsunami in Japan. To understand physical mechanisms and dynamics of these earthquake, scientific drilling projects were conducted rapidly after the earthquakes, i.e., the Wenchuan earthquake Fault Scientific Drilling Project (WFSD) on the LMS fault zone, and the Integrated Ocean Drilling Program (IODP) Expedition 343, Japan Trench Fast Drilling Project (JFAST) in Japan trench. Centering on these scientific goals, rock magnetic studies on the core samples from the drilling holes, which penetrated the seismic slip zone, are expected to produce new and enhanced knowledge on the following aspects.

Tao working at the Pingxi exposure of the rupture of the 2008 Wenchuan earthquake, with Jianye (left) and Hongqiang (right)
  • Magnetic properties of core samples, in particular the fault zone
  • Estimation of the maximum temperature reached within slip zone
  • Finding implications for fluid migration within fault zones

Tao on board the D/V Chikyu during the IODP Expedition 343

These expected results are informative about the faulting mechanisms, such as fault weakening, and dynamic shear stress during the earthquake. To reach this goal, detailed rock magnetic measurements will be supplemented by geochemical and mineralogical analysis.

publications Publications of Tao Yang
  • Yang, T., Mishima, T., Ujiie, K., Chester, F.M., Mori, J.J., Eguchi,  N., Toczko, S., Expedition 343 Scientists (2013). Strain decoupling across the décollement in the region of large slip during the 2011 Tohoku-Oki earthquake from anisotropy of magnetic susceptibility. Earth and Planetary Science Letters, 381, 31–38.
  • Yang, T., Chen, J.Y, Yang, X.S., Wang, H.Q., Jin, H.Q. (2013). Differences in magnetic properties of fragments and matrix of breccias from the rupture of the 2008 Wenchuan earthquake, China: Relationship to faulting. Tectonophysics, 601, 112–124.
  • Yang, T., Chen, J.Y, Wang, H.Q., Jin, H.Q. (2012). Rock magnetic properties of fault rocks from the rupture of the 2008 Wenchuan earthquake, China and their implications: Preliminary results from the Zhaojiagou outcrop, Beichuan County (Sichuan). Tectonophysics, 530–531, 331–341.
  • Yang, T., Chen, J.Y, Wang, H.Q., Jin, H.Q. (2012). Magnetic properties of fault rocks from the rupture of the 2008 Wenchuan earthquake, China: a case study from the Dagou village outcrop at Shuiguan Town, Pingwu County and its implications. Journal of Asian Earth Sciences, 50, 52–60.
  • Yang, T., Liu, Q.S., Zeng, Q.L., Chan, L.S. (2012). Relationship between magnetic properties and heavy metals of urban soils with different soil types and environmental settings: implications for magnetic mapping. Environmental Earth Sciences, 66(2), 409–420.
  • Yang, T., Zeng, Q.L., Liu, Z.F., Liu, Q.S. (2011). Magnetic properties of the road dusts from two parks in Wuhan city, China: implications for mapping urban environment. Environmental Monitoring and Assessment, 177, 637–648.
  • Yang, T., Liu, Q.S., Li ,H.X., Zeng, Q.L., Chan, L.S. (2010). Anthropogenic magnetic particles and heavy metals in the road dust: magnetic identification and its implications. Atmospheric Environment, 44(9), 1175–1185.
  • Yang, T., Liu, Q.S., Zeng, Q.L., Chan, L.S. (2009). Environmental magnetic responses of urbanization process: evidence from the lake sediments in the East Lake, Wuhan, China. Geophysical Journal International, 179, 873–886.
  • Yang, T., Liu, Q.S., Chan, L.S., Cao, G.D. (2007). Magnetic investigation of heavy metals contamination in urban topsoils around the East Lake, Wuhan city, China, Geophysical Journal International, 171, 603–612.
  • Yang, T., Liu, Q.S., Chan, L.S., Liu, Z.D. (2007). Magnetic signature of heavy metals pollution of sediments: case study from the East Lake in Wuhan, China, Environmental Geology, 52, 1639–1650.