| 全球级三个地震构造系统和大地水准面 |
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| 关键词:seismotectonic system geoid antisymmentry global tectonics, |
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| Three Seismotectonic Systems of the Global Scale and the Geoid |
| Based on the comprehensive studies of the global sesmicity and active tectonics, the global seismotectonics is summarized with three great systems:(1)the circum-Pacific seismotectonicsystem of deep subduction(the P system);(2)the Atlantic seismotectonic system of mid-oceanic ridge rifts(the A system );and(3)the continental seismotectonic system of shear nets(the C system).There is important dynamic correlation between the distribution of these three systems on the earth’s surface and the deflection of the geoid relative to the ideal roatating ellipsoid.Comparative analyses are made for the three systems by using the data of tectonic deformation and earthquake mechanism. The A system is characterized by planar extensional fractures. The P system demonstraces obduction and overthrusting of the Atlantic(0°)hemisphere lithosphere to the Pacific(180°)hemisphere lithosphere. The A system representsdilatation of the south hemisphere ,while the C system indicates contraction of the northhemisphere. The relationship between the circum-antarctic oceanic ridge and the C system isprobably assoriated with the longitudinal flow of the mantle. |
| MA Zong-jin,GAO Xiang-lin.1994.Three Seismotectonic Systems of the Global Scale and the Geoid[J].Acta Geoscientica Sinica,15(3,4):97-102. |
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