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Professor Ray Weldon et al from Oregon State University Came to China for Cooperative Research

2016/12/30 9:07:15

At the invitation of Researcher Liu Jing of State Key Laboratory of Earthquake Dynamics, Professor Ray Weldon and Research Assistant Elise Weldon of Oregon State University, and Post-Doctor Shi Xuhua of the Earth Observatory of Singapore went to Xishuangbanna in the southwest of Yunnan together with Post-Doctor Li Zhigang et al of IGL and carried out joint field study of active tectonics March 9~30, 2016.

Researcher Liu Jing and Post-Doctor Li Zhigang visited the Earth Observatory of Singapore on invitation in January 2016 and discussed with the above people about cooperation project “Seismicity of sinistral strike-slip faults in the southwest of Yunnan”. The strike-slip rate of large faults on the southern margin of Tibetan Plateau is a key to understanding distribution and southward extension of edge stress of the plateau.

For the issue of slip rate of Jinghong Fault from Late Pleistocene to Holocene, this field study carried out fine mapping of typical dislocation segments and sampling of geomorphic surface, and collected cosmogenic nuclide, OSL and 14C samples of fluvial terraces and alluvial-proluvial fans, hoping that the slip rate of Jinghong Fault can be effectively limited. Meanwhile, the research personnel relied on a 5m digital elevation model and field comparative observation, overcame serious denudation, human transformation, vegetation coverage and other unfavorable geomorphic conditions, and successfully dug an exploratory trench of paleo-earthquake to reveal the accurate position of Jinghong Fault. The research personnel depicted and cataloged in details the complex paleo-earthquake phenomena recorded on the cross section of the exploratory trench and collected a large quantity of dating samples, hoping to more effectively constrain millennium-scale paleo-earthquake events of Jinghong Fault. With the help of the research example of an exploratory trench of Jinghong Fault, the research personnel tried and assessed cross-section photomosaic and 3D model application of the paleo-earthquake exploratory trench based on photographic image modeling.

This cooperation is on the basis of quantitative research of slip rate and paleo-earthquakes in some segments of Jinghong Fault and jointly cultivates postgraduates. The smooth implementation of the field study laid a good foundation for continued research of the project team on development and controlling factors of active faults and tectonic landforms. The two parties reached an intention for further in-depth cooperation and mutual visit.

 

Fig. 1. Ray Weldon explained tectonic landform interpretation and sampling principles

Fig. 2. Sectional observation and sampling of synchronous deformation of

sedimentary strata in fluvial and alluvial-proluvial fans 

Fig. 3. Excavation and cleanup of a paleo-earthquake exploratory trench

Fig. 4. Depiction and interpretation of a paleo-earthquake exploratory trench