Table of Content

05 June 1985, Volume 7 Issue 2

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Brief Report

THE RELATION OF THE TANCHENG-LUJIANG FAULT WITH THE MAIN FAULTS IN THE SOUTHERN PART OF NORTHEAST CHINA

Zhou Fuhong

1985, 7(2):  1-9. 

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The study fault,discovered by aeromagnetic measurement,is the largest in eastern China.There has been some argument about how the fault extends to the north.Aeromagnetic and gravitational data show that the fault goes through Bohai,Anshan and Shenyang,to the Yilan-Yitong fault straight away.The magnetic field in depth shows that the northern segment of the fault is very different from the intermediate one as the fault passes by Anshan;the intermediate,for example,goes down to the very depth,on the both sides of which are different characterized basements which are boundary planes between the crustal structures with different substances;the northern does not extend so deeply as does the intermediate,making little sense to controlling of composition of substance.It is inferred from available data that the age for the generation of the northern segment of the main fault corresponds to Indosinian Period and the magmatism in this area is governed by the faults trending northwest.And the intermediate segment may have been formed in the late Archeozoic-early Proterozoic time.

THE RMOLUMINESCENCE AGE OF MALAN LOESS

Sun Jianzhong, Li Huhou

1985, 7(2):  10-12. 

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PRINCIPAL CHARACTERISTICS OF GRAVITATIONAL LATERAL SPREADING OF THE CRUSTAL SUBSTANCES IN NORTH CHINA

Zhou Jiu, Huang Xiuwu

1985, 7(2):  13-18. 

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On the basis of crustal structure,focal mechanism,seismicity and geophysical research,the authors suggest that in North China exists gravitational lateral spreading of the crustal substances mainly from SW to NE.In this paper,fundamental characteristics of such a mass spreading as well as its relation to recent tectonic motion and seismic activity are presented.It is shown that gravity is to contribute to recent tectonic motion and seismic activity in this area.

THE CHARACTERISTICS OF THE ACTIVE FAULTS IN THE 1668 GREAT EARTHQUAKE (M = 8¹/₂)AREA, JUXIAN-TANCHENG,SHANDONG PROVINCE

Qiang Zuji, Ye Shizhong

1985, 7(2):  19-26. 

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This paper is to quantitatively investigate some characteristics of several active faults for the study region.For this purpose it is necessary to select those layers which are widespread and are at the same sedimentary altitude,and then to calculate the relative displacement for the fault in question,and finally to study the characteristics of earthquake/strong earthquake-generating structures.

GEOLOGICAL STRUCTURE SETTING OF THE GENERATION OF INTRAPLATE EARTHQUAKES IN CHINA CONTINENT AND THE STRUCTURAL CLASSIFICATION

Zhang Buchun

1985, 7(2):  27-33. 

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This paper places the stress on the disscussion of the geological structure setting for regionalization and zonation of the continental intraplate seismicity in China.In consideration of boundary effects of the plate motion,seven types of seismic structures are presented here:Oassociated with colliding of the continental plates;2) responding to perturbation of the plates;3)associated with the strike-slip fault on the plate boundary;4) associated with large-scale fault zones between the boundaries of the fault blocks;5) associated with the boundaries between the ranges and the basins within the interior of the fault blocks;6)associated with the Genozoic graben-rift system;and 7) associated with the lithosphere and the crustal fractures.

SYMPOSIUM ON TECTONOPHYSICS AND CRUST DEFORMATION,HELD IN BEIJING

1985, 7(2):  34-34. 

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SEISMOGEOLOGICAL CHARACTERISTICS OF THE XINJIANG AREA

Feng Xianyue

1985, 7(2):  35-44. 

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The study area lies in central Eurasian plate,prone to earthquakes.There were 655 earthquakes with a magnitude of 4.7 or more from 1600-1981.By the end of the Paleozoic,this continent had been formed.Since the Pliocene,large-scale uplift has occurred in the Tianshan mountian;the Kunlun mountians and the Qinghai-Xizang Plateau and molasse conglomerate (Q₁^X) have been piled upon the piedmont.In responding to the Early Pleistocene tectonic movement molasse conglomerate was de-formed to result in regional unconformity between Lower and Mid Pleistocene.Since the Miocene the crustal activity in this area has been charecteristic of intermittent uplifting,subsiding and faulting.

STUDY OF ACTIVITIES OF THE BABOSHAN FAULT ZONE IN TERMS OF THE MICROSCOPIC SURFACE FEATURES OF QUARTZ GRAINS IN GOUGE

Jin Fengying, Yan Rune

1985, 7(2):  45-50. 

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The Baboshan fault zone consists of the inner branch fault,the outer branch fault and the Huangzhuang-Gaoliying fault,lying in the southwestern suburb in Beijing.Based on geological information obtained in the field and laboratory result,it is believed an overthrust of the Yenshan stage which has shown no activity at present;the outer branch,a normal fault which is small in its scale and offset;the only Huangzhuang-Goliying fault,an active fault which goes through middle Pleistocene loess.In order to gain further information in this regard,we have examined the surface features of quartz grains for 6 samples of gouge and 4 samples of relative formations obtained from the fault,using a new method to estimate activities of the fault,for which the scanning electron microscope has been used.The results coincide with the macroscopic information from the field.

PRELIMINARY DISCUSSION ON PRINCIPLE, METHOD AND RESULT FOR DYNAMIC STATE OBSERVATION NETWORKS OF UNDERGROUND WATER THAT HAVE BEEN SET IN CHINA

Wang Chengming, Wang Guozhi, Jia Huazhou, Li Shengrong, Wang Tiecheng

1985, 7(2):  51-58. 

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A decision was made for establishing improved observation networks of underground water related with earthquake in China in 1979.This paper is a summation for some important experience and results obtained from underground monitoring that has been conducted since the Xingtai earthquake.A further research in this regard along with that on controlling of the active faults has been carried out.

GEOTHERMAL HEAT FLOW IN THE SONGHUAJIANG-LIAONING BASIN

Wu Qianfan, Xie Yizhen

1985, 7(2):  59-64. 

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Terrestrial heat flow values of 10 drill holes have been obtained based on the data of well logging of 65 samples,and heat conductivity of 43 samples from these core were measured.The Sungliao Basin is not only characterized by comparatively high geothermal field,but also shows well defined regionalization.The general aspect of the geothermal field is distributed as follows both terrestrial heat flow and geothermal gradient or stra-tigraphic temperature show high in inner part of basin and it is decreasing towards outer sides.The geothermal field is characterized by the high in inner part and low in outer side and shows a ring distribution.The geothermal structure of the basin is also discussed.The temperature and heat flow in the bottom of the sedimentary and granitoids and basalt layers under the basin are estimated in accordance with different regions.We tried to analyse the factors inducing the high geothermal field of the basin.They may be as follows:1.Mantle uprising and crustal thinning 2.The high rate of heat production owing to wide distribution of granites 3.The basin is situated in the rift system of eastern China,where geothermal activity is high and 4.The basin belongs to a closed type and is favourable to preservation of heat.Finally,an analysis is made on the relation between geothermal field and lithosphere,gravitational and magnetic field.

DETERMINATION OF AGES FOR QUATERNARY BASALT IN THE HAINAN ISLAND BY INTERPRETATIONS OF THE LANDSAT-1 IMAGES

Chen Shangfu, Zhang Shiliang

1985, 7(2):  65-70. 

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By means of the interpretation of the Landsat images and intensification processing,along with the field evidence and available data,the division of ages for Quaternary basalt in the study area has been conducted.Five stages of basalt eruptions,amounting to 12,have been recognized and the eruptions of basalt may be held to be related to the active faults.

CRUSTAL MOVEMENT AND SEISMIC CHARACTERISTICS OF THE HAINAN ISLAND

Wu Zelong

1985, 7(2):  71-76. 

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An earthquake occurred in the study area in 1605,with a magnitude of 7.5,which caused the continental collapse to have formed the sea.For this area the seismicity is characteristic of 1)clustering in the north and south of the Hainan Island;2)migrating south-north;and 3)a definite seismic period.These kinds of formed characteristics may be related to the crustal isostatic disequilibrium responding to the uplifting of this island in the process of being deformed between the Eastern Asian continent that spreaded south and the South China Sea that was compressing as it opened.

RADIOCARBON DATES(3)

Yuan Sixun, Chen Tiemai, Wang Liangxun, Ma Li, Mong Qingping

1985, 7(2):  77-79. 

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SYMPOSIUM ON THE DIFFERENT STRONG-SHOCK-GENERATING STRUCTURE BACKGROUND ON THE SHALLOW SURFACE FROM THAT IN THE DEEP EARTH

1985, 7(2):  80-80. 

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