共查询到16条相似文献，搜索用时 125 毫秒
1.
首先建立了青藏高原东北地区的地震烈度衰减关系，然后以美国西部地区作为参考地区，在霍俊荣数据的基础上，增加了近年来得到的部分强震记录，采用反映高频地震动震级饱和与近场饱和特征的衰减关系模型，统计得到了美国西部地区水平向基岩加速度峰值与短周期反应谱衰减关系. 与用美国南加州数字宽频带记录建立的美国西部长周期加速度反应谱衰减关系结合，得到了美国西部周期0.04~6 s的反应谱衰减关系. 采用转换方法，得到了青藏高原东北地区水平向基岩加速度峰值与反应谱衰减关系. 相似文献
2.
3.
4.
5.
根据地震构造环境和震害分布特点， 将四川及邻区划分为西南地区和四川盆地地区. 收集了西南地区96次、 四川盆地地区40次近代破坏性地震资料， 并对各次地震的震级参数进行了统一校核. 按照该地区震中烈度与震级、 有感半径与震级的统计关系， 对地震烈度衰减进行了近场与远场特征控制， 建立了地震烈度沿长轴、 短轴和平均轴的衰减关系. 统一了中国与美国面波震级的震级标度， 利用最新得出的美国西部基岩水平向地震加速度反应谱衰减关系， 采用考虑地震加速度的近场距离饱和与震级饱和特征的衰减模型， 转换得到了该地区的基岩水平向地震加速度反应谱衰减关系. 相似文献
6.
7.
福建及邻区水平基岩加速度反应谱衰减关系 总被引：1，自引：0，他引：1
收集福建及邻区内既有仪器测定震级又有宏观烈度调查资料的28次破坏性地震资料,并对上述资料进行烈度等效处理、近远场补点、数据加权处理,加强对大震近场与远场的控制,建立了适合本区的地震烈度衰减关系;利用最新得出的美国西部基岩水平向地震加速度反应谱衰减关系,采用转换方法建立了本区的基岩水平向地震加速度反应谱衰减关系;并与华南地区的地震动参数衰减关系进行了对比,其结果更加符合该区近代地震震害分布的地域性特征.所得结果可应用于该区的地震安全性评价、震害预测、损失快速评估等防震减灾领域. 相似文献
8.
9.
10.
11.
Attenuation relations for horizontal peak ground acceleration and response spectrum in northeastern Tibetan Plateau region 总被引：1，自引：0，他引：1
Introduction Developing local attenuation relations of ground motion is one of the key steps in seismic hazard assessment. Because of inadequate strong ground motion records in China, the attenuation relations used in China are usually developed by using the transforming method (Hu, Zhang, 1983; HU, ZHANG, 1984). To use this method, we need to have both the attenuation relation of seismic intensity for the studied region and the attenuation relations of seismic intensity and ground mo-tion… 相似文献
12.
ＩｎｔｒｏｄｕｃｔｉｏｎＩｔｉｓｔｈｅｆｉｒｓｔｔｉｍｅｉｎｔｈｅｗｏｒｌｄｔｏｇｅｔｔｈｅｓｔｒｏｎｇｍｏｔｉｏｎｒｅｃｏｒｄｓｏｆａｄｅｓｔｒｕｃｔｉｖｅｅａｒｔｈｑｕａｋｅｗｈｅｎｔｈｅＬｏｎｇＢｅａｃｈｅａｒｔｈｑｕａｋｅｏｎＭａｒｃｈ１０,... 相似文献
13.
WANG Heng-zhi YU Yan-xiang HE Bin PENG Xiao-bo ZHAN Xiao-yan ZHU Sheng-chu 《地震地质》2018,40(6):1349-1361
An M4.9 earthquake occurred at the junction of Gaoyou and Baoying on July 20, 2012. In this paper, 43 sets of strong motion records of the main shock are analyzed. With these data, we analyzed the characteristics of the peak ground motion value, attenuation relation, duration and acceleration response spectrum. We draw the peak acceleration contour map of the region near the epicenter. The contour line is smooth and the trend of long axis is northwest-southeast. Distribution of peak acceleration of the observed records is basically consistent with the real intensity distribution. Compared with the predicted result based on the seismic attenuation relation proposed by Yu Yanxiang and Wang Suyunon for eastern China and the Fifth-generation ground motion zonation map, the horizontal PGA and PGV of Gaoyou-Baoying earthquake are higher than the predicted results that are based on the model of Fifth-generation ground motion zonation map, while the PGV is similar with the predicted results which are based on Yu Yanxiang and Wang Suyun's model. We regressively analyzed the spatial-temporal change curves of the two types of relative ground motion durations. Compared with the predicted results proposed by Bommer et al. (2009) based on the NGA strong motion records, the durations of all the three components of this earthquake are higher. 10 typical recordings' acceleration response spectra with 5% damping are calculated, their peak periods are around 0.1~0.3s. The acceleration response spectrum of the station 32BYT, which has the largest amplitude, is considerably larger than the Chinese code design spectra, while it becomes notably smaller when the period is larger than 0.4s. Compared with the horizontal bedrock acceleration response spectrum predicted by the attenuation relationship for the eastern part of China, the observed response spectrum shape is similar with the predicted ones, while almost all the observed response spectrum values (except station 32YCT)are smaller than the predicted bedrock acceleration response spectrum. These phenomena suggest that this earthquake has a weak impact on the seismic fortification standards in this area. Using H/V single-station spectral ratio method, amplitude and site amplification effect of the two typical stations are calculated, and the results show the H/V values are obviously larger than that of ground microtremor. This suggests that the site of the station has obvious amplification effect on ground motion. 相似文献
14.
The Sichuan and adjacent areas is divided into southwest China region (SWCR) and Sichuan Basin region (SCBR) according to tectonic backgrounds and seismic damage distribution features. 96 modern destructive earthquakes in SWCR and 40 in SCBR are gathered respectively. All their magnitude parameters are checked. Based on the statis-tic relations between epicentral intensity and magnitude as well as relation between sensible radius and magnitude, the near and far field seismic intensity attenuation features are represented and controlled. And then the seismic intensity attenuation relations along major axis, minor axis and mean axis are established separately. The system-atic deviations of surface wave magnitude between China seismograph network and U.S. seismograph network are considered in this paper. By making use of the new attenuation relations of bedrock horizontal ground acceleration response spectrum in west U.S., the attenuation relations of bedrock horizontal ground acceleration response spec-trum in SWCR and SCBR are digital transformed based on the attenuation model considering acceleration satura-tion of distance and magnitude in near field. 相似文献
15.
16.
This paper presents a seismic hazard map for the southern part of Ghana prepared using the probabilistic approach, and seismic hazard assessment results for six cities. The seismic hazard map was prepared for 10% probability of exceedance for peak ground acceleration in 50 years. The input parameters used for the computations of hazard were obtained using data from a catalogue that was compiled and homogenised to moment magnitude (Mw). The catalogue covered a period of over a century (1615–2009). The hazard assessment is based on the Poisson model for earthquake occurrence, and hence, dependent events were identified and removed from the catalogue. The following attenuation relations were adopted and used in this study—Allen (for south and eastern Australia), Silva et al. (for Central and eastern North America), Campbell and Bozorgnia (for worldwide active-shallow-crust regions) and Chiou and Youngs (for worldwide active-shallow-crust regions). Logic-tree formalism was used to account for possible uncertainties associated with the attenuation relationships. OpenQuake software package was used for the hazard calculation. The highest level of seismic hazard is found in the Accra and Tema seismic zones, with estimated peak ground acceleration close to 0.2 g. The level of the seismic hazard in the southern part of Ghana diminishes with distance away from the Accra/Tema region to a value of 0.05 g at a distance of about 140 km. 相似文献