Institute of Geophysics,China Earthquake Administration,Beijing 100081,China ; China Earthquake Networks Center,Beijing 100045,China 在期刊界中查找 在百度中查找 在本站中查找
This paper calculates the static coulomb stress changes generated by 4 earthquakes in the Yutian area during 2008 ~ 2014 separately,then discusses triggering influence among them, their accumulated coulomb stress changes and their influence on nearby faults. The results indicate that the MS5. 5 earthquake in 2011 and the MS7. 3 earthquake in 2014 are both in the regions where the coulomb stress change is positive,the stress changes are 0. 004MPa and 0. 021MPa respectively. It means they were triggered by the prior earthquakes. The MS 6. 2 earthquake in 2012 occurred in the place where the coulomb stress change is negative. It is postponed by the prior earthquakes. The coulomb stress change image of the MS7. 3 earthquake in 2014 is in accord with aftershocks (ML≥3. 0) distribution,but some regions on the fault where the coulomb stress change is positive have few aftershocks. Strong aftershocks may occur at these districts in future. In addition,this paper calculates the coulomb stress change on faults nearby, and finds that the coulomb stress changes of different elements in GGC fault are very different. It must get strong triggered-influence though the result may be influenced by the input finite fault model,so it still has a large earthquake-risk. The GGN,PLC,PLW and LBW faults are also triggered by the 4 earthquakes occurred during 2008 ~ 2014,their maximum of coulomb stress change all exceed 0. 002MPa,so they also have strong earthquake-hazard.
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