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Three Russian scientists including Academician Sherman came to China for cooperation and exchange with Academician Ma Jin and her colleagues

2014/5/22 17:51:23

At the invitation of Academician Ma Jin, three scientists from the Institute of the Earth Crust, Siberia Branch of Russian Academy of Sciences including Academician Sherman and Researcher Borniakov visited our institute for cooperation and communication from October 9 to 16, 2013.

This exchange visit is a part of the annual research plan of NSFC-funded international (regional) cooperation and exchange project “Tectonic Physical Law of Fault Activation and Information about Development of Major Earthquakes in Shanxi and Baikal Rift Zones” Academician Ma Jin is the chief scientist for this project. The content of this exchange visit includes two aspects: one is the results of comparative research of Shanxi and Baikal; the other is the experimental research results and field observations relevant with pre-seismic sub-instability stress state. The main activities include:

1.      The two parties of the cooperation separately reported the progress of project research. At first, Chinese research team presented research progress of the Shanxi rift zone. To be specific: doctoral student Zhuo Yanqun did tectonic simulation research on evolution and current state of the Shanxi rift zone and described the characteristics of the deformation field of this zone which evolved on different time scales, as well as possible seismogenic tectonics at present. Postdoctoral student Liu Guanzhong researched cross-fault short-range leveling of the Shanxi rift zone and described its principal tensile stress direction and its relation with earthquakes of Ms5 or greater. Associate Researcher Wang Kaiying analyzed the focal mechanism solutions of the earthquakes in the Shanxi rift zone, indicated that the principal compressive stress direction of the area changed from NW before the Kunlun earthquake in 2001 to NE after the earthquake and further expressed that the compression in NE direction made for the slip of NS faults and the occurrence of major earthquakes. Then, Russian research team reported the research situation on the Baikal rift zone and Shanxi rift zone. Academician Sherman analyzed and compared epicentral distribution and tectonics of the Baikal rift zone and Shanxi rift zone, and researched the seismicity of Shanxi from the concept of deformation waves. Researcher Borniakov conducted experimental simulation of tectonic physics of the Baikal rift zone and Shanxi rift zone and pointed out the formation of the Baikal rift zone is the joint result of active rifting and passive rifting, while Shanxi Rift Zone is the result of interaction of surrounding blocks. Afterwards, Chinese research team continued to present progress on the cooperative research. Associate Researcher Chen Shunyun reported the progress of the research of detecting current tectonic activity by using surface temperature. Postdoctoral student Li Shinian reported the design progress of the large triaxial rock test rig for simulating the shallow-focus earthquake tectonic deformation field. Dr. Zhang Keliang reported the research of coseismic response to Japan  great earthquake in 2011 and identification of non-tectonic gravity influencing factors of the Shanxi rift zone and Baikal rift zone by using GRACE satellite gravity data. Postdoctoral student Song Chunyan introduced current earthquake situation and monitoring status in Xinjiang. Postdoctoral student Liu Yuanzheng reported the possible influence of the Zipingpu reservoir on the 2008 Wenchuan earthquake. Postdoctoral student Ren Yaqiong reported the characteristics of the temperature field of the Yanlie fault in a sub-instability stage. Dr. Ji Yuntao reported the application of digital image-related methods in the analysis of tectonic simulation experiment of the deformation field. Considering the rich contents of the research progress of Chinese research team, Prof. Borniakov supplementarily introduced the research of stick-slip instability characteristics by information entropy, time and other relevant analytical methods, the progress of observation at the deformation station on the southwest wing of the Baikal rift zone and the preliminary observation result of Baikal icequake. Further, Academician Sherman and Academician Ma Jin exchanged opinions on the distribution characteristics of major earthquakes in Central Asia and the Chinese north-south tectonic zone, and other scientific issues, and fully discussed the time-space migration features of major earthquakes.

2.      Comprehensive discussion of project progress. The two sides expressed satisfaction at the progress of their cooperative research and made in-depth analysis and discussion on the issues that need further research and the different ideas and views regarding the research. The two sides both thought the action of faults and the action of block coexist in earthquakes and under different tectonic backgrounds, which show different degrees of importance, whereas in actual research, these two actions shall be differentiated based on different tectonic backgrounds. The two sides discussed the feasibility for further monitoring and mechanism research of seismicity of relevant rift zones.

3.      A detailed research plan for visit of the Chinese side was formulated. A detailed agenda for the visit of three people including Researcher Liu Liqiang to Russia this October for tectonic deformation experiment and other research was determined.

 Academician Sherman is reporting the progress of the cooperative research

Prof. Borniakov is reporting the progress of the cooperative research

Group photo of Chinese and Russian scholars

Chinese scholars are reporting the progress of the cooperative research

The two sides of the cooperation are discussing existing problems and a plan for further cooperation

People from the two sides of the cooperation are discussing and determining the details of the visit to Russia and the experiment scheduled in October