Abstract:This paper calcilates the normal Fourier power spectrum (NFS),Blackman-Turkey power spectrum (BTS) and maximum entropy power spectrum (MES) of the time series of the energy's release for the global shallow earthquakes from 1904 to 1980.By use of the various modes of sampling and methods of the estimation of the power spectrum,it is obtained that the more confident latent periods of the energy's release of earthqukes were 9.1,14.4,45.4 and 128 years,and there are the integer ratio's factors,3 and 5,between these primary periodic components.By means of the cross-power spectrum's method.We obtain.aswell,the initial phases of these primary periodic components,hence,estimate the time of their maximum values,compare them with the time series of the energy's release for earthquakes,and guesse that the next high level's period of the energy's release for the global shallow earthquakes will be about 1990-1994 years.

Abstract:To meet the requirements in earthquake research by means of earth resistivity, the methods of calculating apparent resistivity of horizontal layered medium with high accuracy have been developed. The methods by series summation and numerical integral as well as J₀ (x)-and J₁ (x)fielter are dealt with in detail and compared with each other. The kernel function in the integral and filter methods was briefly discussed in the paper also.

Abstract:In order to model healed fault,standard columnar sample is made from Jinan gabbro,which is sawed with various angles and cemented by epoxy resin.Under the uniaxial stress,healed fault is refractured.It is found that precursor deformation of healed fault,which is refractured,the regular change of acoustic ratio and the bvalue before rupture are similar to the complete samplin some conditions and to the stagger of original faults in sample in other conditions.The angle between fault plane and main stress as well as the degree of fault being healed,is the factor affecting the refrac ture of healed fault.It shows that the problem of healed faults is very important in study of seismic activity.

Abstract:In this paper,the response coefficient Si of geoelectrical leyers is defined on the basis of the theory of the resistivity method in horizontal layered-medium.It is pointed out that the Si represents weight of contribution to Δρs/ρs by variations of the resistivity of the layers.Then the expressions of Si about two-layer,three-layer and the case of the deep buried electrode are brought out and some of numerical results and also obtained.Especially we have a discussion about the influence of the geo-electrical structure on the overlayer response coefficient Si and the deep-layer response coefficient Sn.Finally,by means of this theory on Si the practical cases about nine stations are discussed.
In accordance with this theory and practical data we can gain the conclusions as follows.
1) As for electrical property,the best-observing conditions for resistivity method stations are
overlayer response coefficient S₁=0
deep-layer response coefficient S_n=1
2) The best observing condition for the station site chosen is that the overlayer resistivity may be greater and the deep layer,S smaller.The relation of the resistivities of the layers needs an opposite range of its value.When the value is too large or too small,a deviation from the best-observing conditions takes place.
3) It is not enough for a station to be selected only by the kinds of geoelectrical profiles.To determine a station site,Si is always needed calculating with carefulness.

Abstract:In the paper,the characters of hydrochemieal anomalous variations prior to some moderate and small earthquakes in and around Guangdong province are analysed,and the difference of these characters from those before major earthquakes of other regions of China and the cause of these differences are discussed,too,and then,it has been indicated to exist hydrochemical sensitive components in groundwater as premonitory symptoms.

Abstract:Some examples related to the real case were calculated by using the 3-dimensional constitutive relationship of rock dilatancy,and the nonlinear finite element program for 3-dimension with elastic-dilatantive matrix,presented in (1).
The results show that this method can approximately describ the dilatancy of rock,and can be used to study and simulate the problems involving earthquake faults and the seismogenesis.

Abstract:The genesis of Changma earthquake has been studied in three dimentional space in the paper,including the regional tectonic background and tectonic stress field,the focal fault and stress field,the earthquake force resource,medium condition in and near focus,the source locked model of the earthquake and the seismooccurring mechanism.The author puts forward the source locked model from four direction compression in three dimensional space and the seismooccurring mechanism caused by reserved wedge splitting on the earthquake with Ms=7.5.

Abstract:In this Paper, based on the data of earth resistivity and some measurements of resistivity of rock specimen, the author studied the influence of the thickness of Quarternary over-burden of soil on the normal variations and the precursors of the earth risistivity and the relation is also studied between the mechanical properties and changes of the earth resistivity of the rocks under the Quarternary over-burden soil. The observing station of the earth resistivity must be located at place where the porosity of rocks is low under the thinner Quarternary over-burden soil.

Abstract:Changba Lead-Zinc Mineral Region (in Gansu Province)is a major developing region, but its mountain is precipitous and the mountain slope is easily caused when blasting is done. In order to study the stability of the slope, we applied the method of artificial seismic wave. A surveillance system with two lines intersected was laid, the inversion and forward of the shallow crust velocity profile in the region was made. We considered that the average velocity of the direct-P wave is 1.74 (km/S)near surface, No1 and No2 highway and No1-3 stages region may be divided into five layers from 1.74(km/S) to 2.99(km/S)in velocity, till 540m from surface.
It shows that the explosion seismometer of type CBY-2 is suitable for the shallow seismic exploration and the mathematical procedure used by us is applied to other shallow seismic exploration as well.

Abstract:In the light of practical observation to stress and horizontal deformation, this paper deals with the characteristics of micro dynamic change of crust and the relationship between such change and moderate and strong earthquake events in the northern section of North-south Seismic zone during 1970-1983, from which a preliminary conclusion comes that there exists a relation between the long-term variation of angular velocity of the earth's rotation and the micro-dynamic change of the crust in this region from 1970 to 1983.

Abstract:Study on ground motion by blast excitation in the bedrock region has been carried out in China, but the similar study not in the loess regions. Up to now, we have not any data near source about earthquake effects during blast in the loess regions. Using a blast Work, the decay regularity of ground motion and the effects of topography and geonmorphy on the ground motion were studied in this paper. The comparative study on the ground microtremors characteristic and loess soil properties before and after the blast was carried out too.
The results were obtained that the blast ground motion decay regularity is very similar to that of the natural earthquake ground motion, and if the acceleration develops up to some value, the loess will be failure, and that acceleration(peak-peak)is approximatively equal to the intensity grade X (New Intensity Scale of China). The comparative observation at the time after and before blast excitation indicated that the peak value of the spactra were similar, and the dominant period of the spactra ware increased.

Abstract:本文在1977年以来提出的"予报地震的倍九律"基础上,研究了我国很多地震区大震的异年倍九现象,进一步提出了"异年倍九律"。异年倍九律是指相近地区不同年份大震发震日序间具有倍九日关系的情况。由于大震日期予报至为重要,所以本文仅以7级和7级以上大震进行统计。统计发现我国许多地震区大地震发生日期符合上述异年倍九律现象。这些地区是渤海至燕山前麓地震区,山东郯城潍坊地震区,武都茂汶地震区,四川巴塘、理塘地震区,炉霍、道孚地震区,云南东川、嵩明地震区,西藏墨脱至米林地震带,当雄至奇林湖地震区,新疆巴里坤地震区,乌恰地震区和富蕴至中蒙边境阿尔泰地震带。由这十一个地区异年倍九的震例来看,地震日序差值以36天的频次最高,约占总的统计数40%,月份大多出现在6-9月。此外符合这种时间规律的地区不是杂乱的,例如汾渭地震带就不符合这种规律。因此异年倍九律对某些已有短期震兆的地震危险区发布大震的发震日期有一定参考作用。
异年地震发震日期的倍九律具有较多的统计事实表明,这种现象的出现不是偶然的。作者认为相差几十年和几百年的大震,它们发震的月份相近,且发生地震的日期符合倍九律可能与这些地区在这段时期具有倍九时间特征的外因较强有关。也即与外因对地震的调制作用有关。具体的调制因素和调制机制尚需进一步研究。初步认为可能是气象因素、磁暴,日月引力等外因因素对地震的发生起到了调制作用,以上这三种外因均有倍九天的周期成份,如这三种倍九天的周期成份在某些地区某些时间产生合拍运动,则就可能增加外因对地震的作用。
在自然界除了研究可公度性和周期性现象外,还要研究走向混沌的道路。我们发现,两大类事物分别走向混沌的临界常数A和B,与黄金分割数C之间有一简单关系,即:
2 A-B=C
式中 A=4.66920, B=8.7210, C=0.618(此亦为优选法中的常数)。

Abstract:地震前兆是非常复杂和多种多样的,但从中仍可找到有规律的部分。人们通常所说的灵敏点,常常能显示较强的前兆信息。这种灵敏点可能对某一地区的地壳应力变化反映较灵敏,利用这种灵敏点所出现的异常可以对未来地震发生的范围、时间和震级作出预报。

Abstract:在我国东北地区,从频临日本海的长白山、张广才岭、老爷岭到大、小兴安岭及松辽平原周围,晚第三纪以来发生过成群的火山活动。在调查中共发现大、小火山口、火山口湖、火山锥及熔岩台地等200余处。

Abstract:唐山大震发生在沧东断裂北端与宝坻断裂东端的交汇部位。油井所处的济阳坳陷严格受沧东断裂控制。