Study of anomaly patterns of the ground tilt before two strong earthquakes

The Chinese version of this paper appeared in the Chinese edition ofActa Seismologica Sinica,15, 123–127, 1993.     

Acoustic behavior of budgerigar ( Melopsittacus undulafus L. ) and the mode of its earthquake premonitory call

The Chinese version of this paper appeared in the Chinese edition ofActa Seismologica Sinica,13, 395–398, 1991.     

Accelerated variation of earth-resistivity as a short-immediate precursor of earthquake

The Chinese version of this paper appeared in the Chinese edition ofActa Seismologica Sinica,13, 243–247, 1991.     

The ellipse-projection and two-step regression method for intensity attenuation law

The Chinese version of this paper appeared in the Chinese edition ofActa Seismologica Sinica,15, 109–114, 1993.     

Preliminary study on late Quaternary activities of buried faults in Beijing plain area

The Chinese version of this paper appeared in the Chinese edition ofActa Seismologica Sinica,15, 385–388, 1993.     

Relationship between seismicity and water injection in Ziliujing anticline

The Chinese version of this paper appeared in the Chinese edition ofActa Seismologica Sinica,15, 253–256, 1993.     

The calibration of the LaCoste — Romberg gravimeter

The Chinese version of this paper appeared in the Chinese edition ofActa Seismologica Sinica,13, 248–253, 1991.     

Experiment on fracture of rock under high confining pressure

The Chinese version of this paper appeared in the Chinese edition ofActa Seismologica Sinica,14, 124–127, 1992.     

Application of the neural network approach in the comprehensive prediction of earthquakes

The Chinese version of this paper appeared in the Chinese edition ofActa Seismologica Sinica,15, 257–260, 1993.     

Response spectrum to strong aftershocks of the Lancang-Gengma earthquake

Near-field records of two strong aftershocks with magnitudeM _S=6.7 andM _S=6.3 in the Lancang-Gengma earthquakes sequence, Yunnan Province, November 1988, are used to calculate the response spectrum. The instruments, site conditions and the methods for computing are also illustrated in this paper. The Chinese version of this paper appeared in the Chinese edition ofActa Seismologica Sinica,13, 338–343, 1991. This project is supported by The Chinese Joint Seismological Science Foundation, SSB and the West Yunnan Earthquake Prediction Test Field, Yunnan Seismological Bureau.     

Inversion of waveform from the data of six moderate strong earthquakes in Chinese mainland to seismic moment tensors and source mechanism

Based on Generalized Seismic Ray Theory (Helmberger, 1968), a new quickly linear inversion method from the data of seismic waveform to seismic moment tensor and source mechanism for domestic earthquake is studied in this paper. Six moderately strong earthquakes which occurred in Chinese mainland in the past few years are studied. The seismic source parameters of these earthquakes, seismic moment tensors, scalar seismic moments, fault plane solutions and source time functionsetc, are obtained. The Chinese version of this paper appeared in the Chinese edition ofActa Seismologica Sinica,15, 261–268, 1993.     

Research on the time changes of transfer functions at Heze observatory before and after Heze earthquake of magnitude 5.9 A discussion with Qi Wang

In this paper, the coefficients of Parkinson vectora, b and the in-phase partA _r, B_r and quadrature-phase partA _i, B_i of transter functions are calculated by using two kinds of data processing methods, respectively. The results of both methods are close to each other. All these six parameters above are low in value, showing that the electric structure in Heze area is rather uniform. It seems that the anomalous changes appeared in both results, and the values of parameters decrease before and after Heze earthquake. The Chinese version of this paper appeared in the Chinese edition ofActa Seismologica Sinica,13, 113–120, 1991.     

A new area for earthquake resistant engineering: the control of seismic responses of structures

This paper summarizes the origin and idea of the control of civil engineering structures and reviews the state-of-the art of recent advances in structural control both theoretically and technologically. The prospects for structural control and key research objects to remain to be solved are put forward at last. The Chinese version of this paper appeared in the Chinese edition ofActa Seismologica Sinica,15, 375–380, 1993.     

Deep mantle flow, global tectonic pattern and the background of seismic stress field in China

In this paper we investigate the sources of two kinds of forces to form the stress field in the lithosphere. These are the drag force caused by mantle flow and the force system along plate boundaries. The results show that both forces control the basic stress pattern in China and compressive stresses can fit with the stress patterns constructed by focal mechanisms,in-situ stress measurements in boreholes and that deduced from other geophysical and geological observation. The Chinese version of this paper appeared in the Chinese edition ofActa Seismologica Sinica,13, 295–306, 1991. This research is sponsored by the Chinese Joint Seismological Science Fundation.     

The 1990 Zaisang earthquake of magnitude 7.3 in Kazakstan

The Zaisang earthquake (M _s=7.3) on June 14, 1990 occurred in the boundary between China and Kazakstan. During the great shock, 3 persons lost their lives, 30 people had been hurt and 340 houses collapsed. The intensity of the epicentre is VIII Degree. The economic losses equals to about 320 000 000 Yuan. This large earthquake was occurred on a new born fault, it belongs to main shock-aftershock type earthquake. The Chinese version of this paper appeared in the Chinese edition ofActa Seismologica Sinica,15, 360–365, 1993.     

The techniques of inverse for tectonic stress field in Chao-Shan area using data of sliding faults

The neotectonic stress field in Chao-Shan area is analyzed with the fault striation analysis method. At least four types of stress states are detected, which are in close connection with their locations relative to the basin. Generally, from the subsidence centres to places far from them, horizontal tectonic stress varies from tensile to compressive. The Chinese version of this paper appeared in the Chinese edition ofActa Seismologica Sinica,14, 36–41, 1992.     

The revised m Lg scale in six eastern provinces of China

The influence of the four different methods of measuring Lg amplitude, and the selection of different geometrical attenuation coefficient ζ-values (=5/6 or 1) on the determination ofγ value of Lg wave are discussed.γ=0.0034±0.0001km⁻¹ (when ζ=5/6) for six eastern provinces is redetermined. The revised magnitude calibration function ofm _Lg (mxh),q _E (Δ)=(5/6)logΔ+0.00147Δ+1.81 is deduced. The Chinese version of this paper appeared in the Chinese edition ofActa Seismologica Sinica,13, 171–178, 1991. Projects sponsored by the Chinese Joint Seismological Science Foundation.     

Spectral magnitude and seismic radiated energy computed from CDSN records

We have employed 10 digital records and computed the spectral magnitude and the seismic radiated energy for 18 large earthquakes (M _s≥6) occurred in Eur-asian belt during 1986–1989. The nine digital stations (CD-SN) distribute all over China and one in Germany. The spectral magnitudes of various period have different stability among stations. The stability is better for maximum spectral magnitudemi and seismic radiated energyE, their differences among stations are smaller, especially for the stations where the ray path main penetrates the low mantle. But the stability of corner period is usually not good. The relation between seismic radiated energy and seismic moment magnitudeM _w is lg (E)=1.5Mw+c, wherec is a constant. The maximum spectral magnitudemi=M _w+0.1, it is consistant with theoretical prediction. The Chinese version of this paper appeared in the Chinese edition ofActa Seismologica Sinica,15, 418–426, 1993. This work supported by the Deutsche Forschungsgemeinschaft, Bonn, F. R. Germany. The support is grateful acknowledge.     

The experimental study of parameters of rocks under ultrahigh-pressure state

The parameters of rocks in ultrahigh-presure state are very important to understanding the geodynamics and explosion engineering of rocks. In these experiments the plane wave dynamite lenses were used to drive the flying plates. The flying plate hits the target and produces the ultrahigh-pressure shock wave. The propagation velocity and the particle velocity of shock wave in rock samples were measured by probes, and the relation between density of rocks and pressure was obtained by Rankine-Hugoniot formulas. The maximum pressure in experiments was higher than 70 GPa. The ultrahigh-pressure state formulas obtained are: Limestoneρ=3.22+0.016p; Graniteρ=3.20+0.024p. In which the unit for ρ is g/cm³, the unit forp is GPa. The Chinese version of this paper appeared in the Chinese edition ofActa Seismologica Sinica,13, 96–103, 1991.     

An investigation on the relationship between high energy charged particle flux in the upper atmosphere and the earthquake activities

This paper presents the analytic result on the correlation between the high energy charged particle flux in the radiation belt around the earth and the earthquake activities. It points out that the increment of count-speed of high energy charged particle flux in the upper atmosphere has definite relationship with the intensity of seismic activities on the earth. The Chinese version of this paper appeared in the Chinese edition ofActa Seismologica Sinica,14, 100–103, 1992.