Table of Content

06 March 1985, Volume 7 Issue 1

Previous Issue    Next Issue

Brief Report

QUAQUAVERSAL STRUCTURE RISE AND HEZE EARTHQUAKE

Zhu Haizi

1985, 7(1):  1-13. 

Asbtract ( )   PDF (1792KB) ( )  

Related Articles | Metrics

A M 5.9 earthquake occurred in the Heze area of Shandong in November 1983 as well as a M 7 earthquake of 1937 on the same seismic 20ne.Following interpretations of Landsat images,an arcuate distribution of the drainages can be found.A comprehensive analysis of deep-shallow structures,ground hot flow,observations of geodetic deformation,seismicities and elavated groundwater table preceding the earthquake indicates that the earthquake in point may have,appeared at uprising-doming structure central,responding to the failute of these structures.Seismic hazard may depend on shallow structures and the depth to the water table,as well as the behasiour of structures of this kind.Associated with the earthquake,sand liquation can be distinquished from that resulting from the other shocks.

THE MTS SOFTWARE FOR THE MMS-02 DATA LOGGER

1985, 7(1):  14-14. 

Asbtract ( )   PDF (180KB) ( )  

Related Articles | Metrics

THE EFFECT OF TEMPERATURE, PRESSURE AND PORE PRESSURE ON THE STRENGTH AND SLIDING BEHAVIOR OF THE GOUGES

Ma Jin, D.E. Moore, R. Summers, J.D. Byerlee

1985, 7(1):  15-24. 

Asbtract ( )   PDF (1456KB) ( )  

Related Articles | Metrics

The strength of the samples with different fault gouges was studied under different pressure,temperature and pore pressure.The fault gouges included crushed granite,serpentine,illite and a natural fault gouge (DLV),collected from borehole along the San Andreas fault.Based on the response of the gouges to the pressure,temperature and pore pressure,the fault gouges were classified into two groups:the gouges of clastic type and the gouges of clay type.For the gouge of clastic type,such as crushed granite,its strength was very sensitive to the pressure.When the confining pressure increased 1kb,the strength of the gouges got a raise of 1.47 kb.It hasn't seen any response of the gouge to the temperature.Its response to the pore pressure is consistent with the effective pressure law.The rest three are gouges of clay type.The general character of them are as follows.There was an outstanding effect of the temperature on the mechanical behavior of the clay type gouges.The change of pore pressure exerted influence on the trend of the response to the temperature.The effect of pressure for clay type gouges only can be seen when the temperature is lower than 200℃. The results of X-ray diffraction indicate that no mineral change has been found in crushed granite gouge up to 600℃ and the strength of it was controlled by the compaction.The mechanial behavior of clay type gouge reflect the change of clay mineral composition,structural state of gouge material and probably,the change of permeability.Pore pressure has an effect on the chemical process.So it is clear that need pay attention to the effect of the physico-chemical environment on the strength.

THE CHARACTERISTICS OF GOUGE FROM HONGHE AND QUJIANG FAULT ZONES AND THEIR SEISMO-GEOLOGICAL IMPLICATIONS

Yang Zhuen, Hu Biru, Yang Jiwu

1985, 7(1):  25-32. 

Asbtract ( )   PDF (5632KB) ( )  

Related Articles | Metrics

The study of products from active fault has been concened by seismogeologists recently.Fault gouge from Honghe and Qujiang active fault zones has been studied.It is,shown that microstructure,grain size,fabric and SEM micro-surface texture on quartz fragment in gouge were formed during steady-state slip stage,rapid shear motion associated with earthquakes and retro-metamorphism and other chemical process in active fault zone.As the result of this study,the author pointed that the south segmetn of Honghe fault zone may be steady-state slip active fault,and the north segment of Honghe fault zone and Qujiang fault zone are stick slip active fault.

INVESTIGATION ON THE PALEOSTRESS OF YI-SHU FAULT ZONE

Zhang Yen

1985, 7(1):  33-40. 

Asbtract ( )   PDF (5509KB) ( )  

Related Articles | Metrics

Theoretical consideration and method on evaluatng paleostress value of the fault zone are described by using the microstructure in mineral.The tectonic stress of the Yishui-Tongtou and Tongwu-Gegou ruptures on the norther part of the western branch of Yishui-fault zone in the late Yanshanian (post K₁) was calculated according to free dislocation density in deformed quartz crystal and percentage of deformed twin in calcite.The result shows that the stresses for the two crystals range from 1000-1500 b and 700-1100b,respectively.The microstructures of the fault zone show that the stable dislocation creep may occur both in the process of dry ductile/brittle-ductile deformation.Considering the effective water in the fault zone,it is likely that the evaluation can yield a real value by using McGomick relation rather than Weather's.

CLASSIFICATION OF FAULTING AND ITS DENOMINATION IN CHINA

Jiang Pu, Dai Lisi

1985, 7(1):  41-48. 

Asbtract ( )   PDF (1014KB) ( )  

Related Articles | Metrics

The machanical nature of faulting and its classification and its names given were dealt with under consideration of rakes/dips for the nodal planes and relative motion of the blocks by use of mechanism solution of the earthquakes in China.The faulting is named by combining its three factors,the type of slip,relative motionn of blocks and dip angle.Some main characteristics of the faulting in China were discussed briefly in the end of the paper.

DISTRIBUTIONS AND FORMATION OF THE GEOTHERMAL FIELD ALONG THE COAST, SOUTHEASTERN CHINA

Wang Jun

1985, 7(1):  49-58. 

Asbtract ( )   PDF (1392KB) ( )  

Related Articles | Metrics

The study area,an old continent block with a Coledoman folding basement,is located 20-31.5°N,115-122°E,along the southeastern edge of the Eurasian plate.Granite and volcanic rocks are widespread throughout this area with an age decreasing from west to east.The Yanshanian granite exists mainly along the coast and the tectonic activity also shows an increase to the coast.For the coastal area the geothermal gradient and the geotemperature show a higher value ranging from 50-70℃ at a depth of 1000m and 2000m,respectively,and the highest up to 60℃ and 90℃,somtimes even to 100℃and 130℃.Presented here are some data from the Wuyi Mountains,the Moyang Basin and the Jinqu Basin and the like.Distributions and formation of the geothermal field are dependent on deep structures in the earth's crust and the regional geotemperature,on the crustal thickness as well as on the geological structures.The occurrence and distribution of the hot springs are correlated with two major deep faults striking NE and NW.In addition the content of radioactive elements in the Yanshenian granite is about two times higher than that of the contemporaneous granite found in North China.Two types of geothermal field may be distinguished in the study area:1) conduction and 2) conduction superposed by hot water conduction.

APPLICATION OF THE TECTONIC LANDFORM IN THE STUDY OF SEISMOGEOLOGY IN THE GUANGDONG PROVINCE

Zhang Hunan

1985, 7(1):  59-66. 

Asbtract ( )   PDF (1058KB) ( )  

Related Articles | Metrics

The application of the tectonic landforms in the study of seismogeology in the Guangdong province mainly consists of the two aspects:study of the neotectonic movement for the zoning of the potential risk;the recognization of the activities of the faults,both of them are complementary to one another.This paper has an introduction to the efforts in this regard.

AN ANALYSIS ON EARTHQUAKE PRECURSOR OF F^- IN GROUND WATER

Fang Xuanming

1985, 7(1):  67-69. 

Asbtract ( )   PDF (297KB) ( )  

Related Articles | Metrics

In this paper,the earthquake precursor of F^- in ground water is dealt with and the observations suggest the median or short term anomalous variations prior to some moderate and small shocks in and around Guangdong Province.

SEISMOLOGICAL SYMPOSIUM ABOUT THE XIANSUIHE SEISMIC BELT HELD IN CHENGDU

1985, 7(1):  70-70. 

Asbtract ( )   PDF (182KB) ( )  

Related Articles | Metrics

LATE PALEOZOIC POLAR WANDER PATH FOR THE TARIM BLOCK AND TECTONIC SIGNIFICANCE

Bai Yunhong, Chen Guoliang, Sun Qingge, Sun Yuhang, Li Yongan, Dong Yujie, Sun Dongjiang

1985, 7(1):  71-80. 

Asbtract ( )   PDF (1362KB) ( )  

Related Articles | Metrics

Step thermal,and A.F.demagnetizations have been done for 518 samples (47 sites) from Sishichang section across the Aksu area,in the Tarim Basin.The mean paleomagnetic pole positions calculated upon the characteristic magnetization are φ=10.5°S,λ=151.2°E for the Late Devonian;φ=52.2°N,λ=179.5°E for the Late Carboniferous;φ= 56.5°N,λ=190.1°E for the Early Permian.The results show that the Tarim block was one of the parts of the Laurasia but not of the Gondwana during Late Paleozoic,and that from the Late Carboniferous to Early Permian the Tarim block had collided with the Kazakhstan block,Siberian block and Russian block,and no displacements large have occurred between these blocks since the Mesozoic.However,the pole position in the Permian for the Tarim block differs obviously from that for Sino-Korea block (φ= 44°N,λ= 358°E,after M.W.McElhinny et al.).The differential paleo-latitude was about 10?between the Tarim and Sino-Korea block in the Permian.Their orientations were also different from each other.The paleomagnetic result is contrary to the geologically conventional idea that the-two blocks in question appeared as a whole in the Late Paleozoic.

APW PATHS FOR THE NORTH AND SOUTH CHINA BLOCKS

Lin Jinlu

1985, 7(1):  81-83. 

Asbtract ( )   PDF (399KB) ( )  

Related Articles | Metrics

SYMPOSIUM ON THE ELECTROMAGNETIC INDUCTION HELD IN GUANGZHOU

1985, 7(1):  84-84. 

Asbtract ( )   PDF (136KB) ( )  

Related Articles | Metrics