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The Crustal Structure and Seismic Activity in North China

Acta Geologica Sinica(English Edition) 1989年第4期63卷 343-359,448-449页

作者： feng rui institute of geophysics, state Seismological {2., beijing Huang Guifang, Zheng Shuzhen, Wang Jun, yan huifen geophysical Prospecting party, state Seismological {2., Zhengzhou, Henan and zhang ruoshui Seismological Technique College, state Seismological {2., yanjiao,Hebei institute of geophysics State Seismological Bureau Beijing China

A layered crustal block model of North China has been constructed based on large amount of data from seismic sounding carried out in recent two decades. Some deep fault zones, such as the *** and Tancheng-Lujiang fault zones, divide the upper crust of North China into three upper crustal terranes and nine bolcks. There are distinct differences in velocity and depth distributions, which reflects Cenozoic block faulting in North China in the process of formation of the deep structure. The upper crust shows the features of transition in isostatic adjustment. The existence of a low-velocity layer in the middle crust is characteristic of the crustal structure in North China. There seems to be an increase of rheology of the rocks in the lower crust and a persistence of stable regional stress field. The patterns of the Moho on two sides of the yanshan-Taihang Mountains are different. The relief of the Moho around beijing, Shijiazhuang and Guangrao where the deep faults join together shows a quadrantal distribution in some degree. The dynamic sources for seismic activity are the NE-SW horizontal compression and the diapirism of the upper mantle. The middle and upper crust, especially the layered block structure has the most significant effects on seismicity, and the occurrence of earthquakes is more closely related to them than to the Moho.

关键词： The Crustal Structure and Seismic Activity in North China Activity

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The Rapid Inversion of 3-D Potential Field and Program Design

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Acta Geologica Sinica(English Edition) 1986年第4期 83-96页

作者： feng rui institute of geophysics, state Seismological {2., beijing yan huifen and zhang ruoshui geophysical exploration party, state Seismological {2., beijing

The application of three-dimensional inversion of gravity and magnetic fields is very important not only in geophysical researches, but also in the study of geological structures. A formula of potential field in frequency-domain, developed by Parker in 1973, can be used as a rapid and effective algorithm in gravity and magnetic inversion. The technique has been improved then by Oldenburg, Sprenke, feng and *** addition to a brief introduction of Parker’s algorithm and its applications, this paper includes the following five parts: basic computational techniques, inversion of single layer, convergence and constraints, simultaneous inversion for density and topography as well as inversion of multilayers. The authors present relevant practical iterative formulas and its varieties when density distribution varies with depth in linear or exponential relation. In order to maintain computation stability and speed up iteration convergence, some approaches are taken in the program design, for instance shifting lower interface of the studied layer, inverting corrections of topography, reducing grid boundary effects and utilizing low-pass filter. With the consideration of the nonuniqueness of the inversion, a method of using seismic data to constrain the range ofpossible models is discussed. It is pointed out that the density variation generates less effects than those of topography on the spectrum of gravity anomaly in second order. Therefore density contrast and topography can be inverted simultaneously by an alternative weighting iteration. By analogy, the inversion of multilayer model can be done in the above procedure. An approach of model decomposition is useful in the computation of multilayer model. The techniques discussed in the present paper for gravitational field are also valid for magnetic field.

关键词： The Rapid Inversion of 3-D Potential Field and Program Design

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