Anisotropic changes in apparent resistivity associated with strong earthquakes;

The paper analyses the nonlinear response of space truss subjected to strong earthquake and its failure mechanism using computer program,indicating the space truss is characterized the brittle failure and drawing some conclusions useful for engineering practice.

By analyzing the relationship between ground water behavior and strong seismic activity during the past more than 20 years in North China, we have found similar water level descending variation of a part of wells in the short-term stage before several strong earthquakes.

Coulomb stress changes associated with the strong earthquakes occurred since 1904 in Sichuan and Yunnan Provinces of China are investigated.

After the intense earthquake happened at Wenchuan in 5.

The intense earthquake happened at Wenchuan zone in "5·12".

Physical simulation study on dynamic failures of layerad rock masses under strong ground motion;

To study the characteristics of inelastic response spectra,an attenuation relationship is established for inelastic response spectra involving earthquake magnitude,source-to-site distance,and site class based on 266 strong ground motion records which collected from 15 strong earthquakes in California of America.

Based on 266 strong ground motion records from 15 significant earthquakes in California of America, an attenuation relationship was developed for ground motion hysteretic spectra with earthquake magnitude, source-to-site distance, and site class.

This paper introduces the principle and specification of model GDQJ-1 A strong motion data collection system.

The result suggests that 5th seismic active period of NE China will be over in about 2008,and that the maximal earthquake intensity is about magnitude 6 in this active period.