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Editor Work1998 Vol. 6, No. 1
Previous Issue
1998, 6(1): 1-23.
Abstract
321KB
Some problemss and study results in engineering earthquake practice was discussed in the paper. They are the attenuation of relationship of near source ground motion with saturation and derivative model of near source ground motion saturation with regard to the rupture dimension of source dislocation and the attenuation field of earthquake intensities in China continent, the characteristics of design basis ground motion and the synthesis of design ground motion time history for the Nuclear Power Plant, zoning of earthquake resistance level, taking the middle lower reaches of Jinshajiang River for example, the engineering active fault, and the evaluation of surface dislocation caused by earthquake.
Some problemss and study results in engineering earthquake practice was discussed in the paper. They are the attenuation of relationship of near source ground motion with saturation and derivative model of near source ground motion saturation with regard to the rupture dimension of source dislocation and the attenuation field of earthquake intensities in China continent, the characteristics of design basis ground motion and the synthesis of design ground motion time history for the Nuclear Power Plant, zoning of earthquake resistance level, taking the middle lower reaches of Jinshajiang River for example, the engineering active fault, and the evaluation of surface dislocation caused by earthquake.
1998, 6(1): 27-39.
The design ground motion time histories was synthesized for the Shahuan Nuclear Power Plant Site according to the characteristics of the site and the specifications of input motion in the paper. The acceptability of synthetic time histories for the specified criteria by U. S. NRC Standard Review Plan and ASCE4 86 Standard SASRNS and Commentary on Standard for SASRNS was also discussed from the total time duration, the envelop design response spectra, the frequency intervals in the computed spectra and spectral values, adequately matching a target PSD function compatible with the design response spectra and the input motion time histories to be statistically independent and so on.
The design ground motion time histories was synthesized for the Shahuan Nuclear Power Plant Site according to the characteristics of the site and the specifications of input motion in the paper. The acceptability of synthetic time histories for the specified criteria by U. S. NRC Standard Review Plan and ASCE4 86 Standard SASRNS and Commentary on Standard for SASRNS was also discussed from the total time duration, the envelop design response spectra, the frequency intervals in the computed spectra and spectral values, adequately matching a target PSD function compatible with the design response spectra and the input motion time histories to be statistically independent and so on.
1998, 6(1): 40-54.
The Hong Kong Kowloon Block which have been uplifted continually and stable since late Cretaceous Paleogene period is identified and determined as a potential source with maximum credible magnitude M=5.5, while the late Cretaceous Paleogene fault basins which are located around the Hong Kong Kowloon Block are determinated as potential source with maximum credible magnitude more or equal 6.0 based on the characteristics of seismo geology tectonic activities in the Hong Kong and its adjacent regions. The attenuation law of peak ground acceleration (PGA) and standard response spectra of acceleration () with damping 5% underlain by rock ground were determined by comparing Chinese continent with Westen of USA in the similarity of tectonic environment of continental earthquaks, potential source with credible seismic magnitude 5.0～7.5, and considering ground motion saturation at near source. The near source attenuation model of acceleration and response spectrum also reflect the field of Intensity distribution in East China and the dimension of source faulting in Chinese continent. The seismic hazard analysis and calculating of bedrock ground motion were completed by considering the ground motion attenuation model with near source saturation and using ordinary method of seismic hazard analysis based on Poisson probability model for the Hong Kong region. In this paper the seismic design parameters underlain by rock ground and its zoning which contain peak ground acceleration and acceleration response spectra with annual exceedance probability level p= 0.02, 0.002 and 0.0004 are also was given. The seismic parameters and the corresponding zoning maps could be satisfied for the two level seismic design of many engineering structures.
The Hong Kong Kowloon Block which have been uplifted continually and stable since late Cretaceous Paleogene period is identified and determined as a potential source with maximum credible magnitude M=5.5, while the late Cretaceous Paleogene fault basins which are located around the Hong Kong Kowloon Block are determinated as potential source with maximum credible magnitude more or equal 6.0 based on the characteristics of seismo geology tectonic activities in the Hong Kong and its adjacent regions. The attenuation law of peak ground acceleration (PGA) and standard response spectra of acceleration () with damping 5% underlain by rock ground were determined by comparing Chinese continent with Westen of USA in the similarity of tectonic environment of continental earthquaks, potential source with credible seismic magnitude 5.0～7.5, and considering ground motion saturation at near source. The near source attenuation model of acceleration and response spectrum also reflect the field of Intensity distribution in East China and the dimension of source faulting in Chinese continent. The seismic hazard analysis and calculating of bedrock ground motion were completed by considering the ground motion attenuation model with near source saturation and using ordinary method of seismic hazard analysis based on Poisson probability model for the Hong Kong region. In this paper the seismic design parameters underlain by rock ground and its zoning which contain peak ground acceleration and acceleration response spectra with annual exceedance probability level p= 0.02, 0.002 and 0.0004 are also was given. The seismic parameters and the corresponding zoning maps could be satisfied for the two level seismic design of many engineering structures.
1998, 6(1): 55-60.
The seismo geotechnical environmental characteristics of Beihai City area are discussed from data of geomorphic features, unconsolidated deposits, site soil and site types, and period of site in the paper. Three geologic geomorphic elements and three earthquake resistant zones with design ground motion parameters were delineated from seismo geotechnical environmental characteristics of the Beihai City area. The evaluation and prediction of seismo geologic hazards in Beihai City area are also given here.
The seismo geotechnical environmental characteristics of Beihai City area are discussed from data of geomorphic features, unconsolidated deposits, site soil and site types, and period of site in the paper. Three geologic geomorphic elements and three earthquake resistant zones with design ground motion parameters were delineated from seismo geotechnical environmental characteristics of the Beihai City area. The evaluation and prediction of seismo geologic hazards in Beihai City area are also given here.
1998, 6(1): 61-66.
The attenuation model for magnitude and distance saturations of near source peak ground acceleration is discussed by regression analysis of data of strong ground motion records in the paper. The result shows that the effect of magnitude and distance saturations to be characterized by R0(M) depends not only on magnitude but also on the behaviors of the source and its spectra. The influence of factors on attenuation relation of near source ground motion peak acceleration are also discussed in accordance with the attenuation regression models, condition of strong motion record site, mechanism of earthquake, and so on.
The attenuation model for magnitude and distance saturations of near source peak ground acceleration is discussed by regression analysis of data of strong ground motion records in the paper. The result shows that the effect of magnitude and distance saturations to be characterized by R0(M) depends not only on magnitude but also on the behaviors of the source and its spectra. The influence of factors on attenuation relation of near source ground motion peak acceleration are also discussed in accordance with the attenuation regression models, condition of strong motion record site, mechanism of earthquake, and so on.
1998, 6(1): 67-71.
The seismological and geological environmental characteristics of a man made island in the beach sea area of the Liaohe River outlet are discussed from the regional and near site seismology and geology in this paper. On the basis of the environmental characteristics an evaluation of earthquake safety of the man mad island site has been made after determining seismic intensity and earthquake resistant design parameters and estimating risk of geologic hazards induced by earthquake at the site. The results show that the site is suitable for building the man made island in the beach sea area from the view point of earthquake safety of the site.
The seismological and geological environmental characteristics of a man made island in the beach sea area of the Liaohe River outlet are discussed from the regional and near site seismology and geology in this paper. On the basis of the environmental characteristics an evaluation of earthquake safety of the man mad island site has been made after determining seismic intensity and earthquake resistant design parameters and estimating risk of geologic hazards induced by earthquake at the site. The results show that the site is suitable for building the man made island in the beach sea area from the view point of earthquake safety of the site.
1998, 6(1): 72-74.
After delimiting potential earthquake sources in a working area, determining of seismicity parameters in potential earthquake sources, and from attenuation relation of ground motion, we have made an analysis of seismic risk for both these eraeas. We abtained earthquake intensity of different probability and horizontal peak accleration at the bed rock as well as response spectrum. From the statistics of earthquake intensity attenuation a basic intensity of the sites was obtaimed. Based on the engineering seismologcal conditions we have classified geological units and types of sites, calculated seismic response of different probability, and determined ground motion parameters for design.
After delimiting potential earthquake sources in a working area, determining of seismicity parameters in potential earthquake sources, and from attenuation relation of ground motion, we have made an analysis of seismic risk for both these eraeas. We abtained earthquake intensity of different probability and horizontal peak accleration at the bed rock as well as response spectrum. From the statistics of earthquake intensity attenuation a basic intensity of the sites was obtaimed. Based on the engineering seismologcal conditions we have classified geological units and types of sites, calculated seismic response of different probability, and determined ground motion parameters for design.
1998, 6(1): 75-78.
Changzhi Cement Factory site is located in Changzhi basin, Shanxi Province. Two seismically active zones run outside it, one is Shanxi zone, the other is North China zone. So the seismo geological evluation is very important for Changzhi Cement Factory. The evaluation shows no effect of the active zones on the site.
Changzhi Cement Factory site is located in Changzhi basin, Shanxi Province. Two seismically active zones run outside it, one is Shanxi zone, the other is North China zone. So the seismo geological evluation is very important for Changzhi Cement Factory. The evaluation shows no effect of the active zones on the site.
The egineering site area for Datong Power Plant 2 is located in Datong basin at the northern end of Shanxi fault depression zone. On the western side of the basin there is NNE NE trending Emokou Kouquan fault which has continued to be active since late Quaternary. On the eastern side of the basin there is NE NEE trending Liu Lingshan fault which is still active at present. Inside the basin there is a series of NEE NE trending secondary faults, some of which are still active at present. However, the Shuiyu fault, the nearest to the engineering site ,has been active since 30～15 thousand years ago, but it well not affect the stability of the site.
The egineering site area for Datong Power Plant 2 is located in Datong basin at the northern end of Shanxi fault depression zone. On the western side of the basin there is NNE NE trending Emokou Kouquan fault which has continued to be active since late Quaternary. On the eastern side of the basin there is NE NEE trending Liu Lingshan fault which is still active at present. Inside the basin there is a series of NEE NE trending secondary faults, some of which are still active at present. However, the Shuiyu fault, the nearest to the engineering site ,has been active since 30～15 thousand years ago, but it well not affect the stability of the site.
1998, 6(1): 85-90.
The NE trending Jingpingshan XiaoJinhe fault zone obliquely passes through the engineering site area for Jinping Hydropower Station from northeast to southwest. In the southeastern and northwestern parts of the area exist the NNW trending Yangpingzi Zhichanggou fault set and NW trending Qianbo and Gaoniuchang faults, respectively. During late Quaternary most of the faults in this region has become except the Mashantou Zhoujiaping and Wake faults of the Jinpingshan Xiaojinhe fault zone as well as the NW trending Qianbo fault, which were still weakly active at that time. The neotectonic movement in the engineering site area was dominated by the uplift of the whole region accompanied by horizontal displacement and rotation in historic and recent time. Therefore, the crust in the studied area is relatively stable.
The NE trending Jingpingshan XiaoJinhe fault zone obliquely passes through the engineering site area for Jinping Hydropower Station from northeast to southwest. In the southeastern and northwestern parts of the area exist the NNW trending Yangpingzi Zhichanggou fault set and NW trending Qianbo and Gaoniuchang faults, respectively. During late Quaternary most of the faults in this region has become except the Mashantou Zhoujiaping and Wake faults of the Jinpingshan Xiaojinhe fault zone as well as the NW trending Qianbo fault, which were still weakly active at that time. The neotectonic movement in the engineering site area was dominated by the uplift of the whole region accompanied by horizontal displacement and rotation in historic and recent time. Therefore, the crust in the studied area is relatively stable.
1998, 6(1): 91-96.
Some correlation of seismicity parameter to b should be considered in seismic hazard analyses, because in determining the magnitude frequency relation and correlation analyses of parameters there are also some correlation of b to a,, and Mmax. So if Mmax and b have been determined value of of future seismicity should be limited. If the Mmax was taken to be 8 and b value to be 0.73, the value of 13.943 may be too smaller to use.
Some correlation of seismicity parameter to b should be considered in seismic hazard analyses, because in determining the magnitude frequency relation and correlation analyses of parameters there are also some correlation of b to a,, and Mmax. So if Mmax and b have been determined value of of future seismicity should be limited. If the Mmax was taken to be 8 and b value to be 0.73, the value of 13.943 may be too smaller to use.
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