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《EARTH SCIENCE FRONTIERS》 1999-04
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CHANGING VIEWPOINT FROM FAULT TO BLOCK--A DISCUSSION ABOUT THE ROLE OF ACTIVE BLOCK IN SEISMICITY

Ma Jin(Institute of Geology, China Seismological Bureau, Beijing, 100029)  
The role of active block in seismicity is discussed in this paper. Intraplate earthquakes almost distribute along a line in space generally, while the intraplate earthquakes in China scatter in a large region. Faults with more than two directions are often involved in a strong intraplate earthquake, and strong earthquakes usually migrate along one margin fault of a block or jump across the block. The P axis of focal mechanism of medium and small earthquakes often rotates about 90° around some strong earthquakes. This phenomenon is difficult to be explained by using the change of orientation in regional stress, but it can be explained by the alternate slip along two margin faults of a block. No matter what the long distant effects of earthquake on anomalies, the unusual distribution of earthquake intensity as well as the characteristics of earthquake sequences may also indicate the role played by active block. The movement mode of block inferred by seismicity may vary from each other in different region, which may be caused by the angle difference between the stress axis and the striking direction of two faults. Based on the facts mentioned above, it is suggested that the viewpoint should be changed from active fault to active block when analyzing the seismicity in China.
【Fund】: 国家自然科学基金
【CateGory Index】: P315.2
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