Their long periods of 321 and 347 years are comparatively consistent with the time duration (330 and 361 years) of the second and third active periods in North China seismic region It can be seen that activities of strong earthquake in Shanxi seismic zone and those in North China seismic region change synchronously and mainly controlled by the salient periods of 321 and 347 years;
At present,the principal compressive strain rate in Xingtai earthquake region is very small,with a magnitude of-0.352×10~(-9)/yr,and the principal tensile strain rate is relatively large,with a magnitude of 3.306×10~(-9)/yr,which shows that the tensile strain in this area is predominated,and the crust is in a tensional state;
In order to assure engineering design quality of tall building and increase ductile performance in earthquake region,according to the part of enhancing seismic conceptual design of technical specification for concrete structure of tall building(JGJ3-2002) and the code for seismic design of buildings(GB50011-2001),this paper represents simplicity,entirety,regularity,uniformity,rigidity,capability of seismic and so on of structure by engineering examples.
The seismicity of the studying area (29°～35°N, 114°～120°E), which is located in the transition area of earthquake region in North China and South China, is not high, and the attenuation of intensity has its own characters in focal mechanism, radiate medium and site.
The paper describes the on-the-spot emergency response,introduces the behaviors of different types of structure in the earthquake area and the characters of earthquake damage,and summarizes the emergency response on the basis of building safety assessment and on-the-spot emergency response experience.
The losses in earthquake disaster are determined by the degree of destruction of building structure to a large extent In accordance with the particular characteristics of the damages of different building structures,a general evaluating method on the relation among structural type,earthquake disaster loss and project investment is presented It provides certain theoretical basis for the optimization of the types of building structures in seismic area
The project of Xixiaoping Bridge(DK107+921.80) was chosen as pre-stress concrete continuous box girder bridge,whose span is 48 m+80 m+48 m. As the bridge located in the seismic area of 7 degree,the seismic design should be made.
If the seismic region is linear, then the accuracy of prediction can be improved by dividing the region into transform zones and replacing the distribution densities and their estimates by comparison of matrices.
Propagation of internal gravity waves to the altitudes of the ionospheric D and dynamo regions in the seismic region (Kamchatka)
The influence of conductivity perturbation in the lower atmosphere on the DC electric field over a seismic region is investigated.
This disturbance is caused by an external current over a seismic region.
The deep and shallow structure, composition and its relation to earthquakes in Chaoyang - Yixian seismic region
The joint analysis of geological, geodetic (GPS), and seismological data on the Sumatra earthquake area shows that these two mechanisms also act in the Indonesian part of the Alpine-Himalayan mobile belt.
The Zhangye network is situated in the middle segment of Hexi corridor and Qilina mountain, which was regarded as a monitoring earthquake area.
The deep seismic reflection profiling carried out in Xingtai earthquake area provides a new knowledge of the crustal structure of the Shulu fault basin and its vicinity.
3-D structural reconstruction of Moho in the Tangshan earthquake area by using inversion of curved interface
Observational data from the Tangshan earthquake area are processed, 3-D Moho discontinuity in the area is rebuilt, and finally, the relationship between the regional structure and seismicity is revealed.