摘要
以编制《中国地震动参数区划图》时所构建的地震潜在震源区模型和地震活动性模型为基本输入,在四川省丹棱县及其周缘地区开展基于阿里亚斯烈度的概率地震危险性分析,计算50年超越概率10%的阿里亚斯烈度(Arias Intensity,Ia)。结果表明:丹棱县及其周缘绝大部分地区的Ia值都在0.11m/s以上,部分地区在0.32m/s甚至0.54m/s以上,具有较高的地震诱发滑坡风险,应当加强人员密集区的地震诱发滑坡危险性评估。根据不同Ia预测方程计算得到的Ia分布有较大差异,因此在计算Ia时应考虑多个Ia预测方程,对最终结果进行加权平均,以减小Ia结果的不确定性。同时还发现Ia值与1.0s的谱加速度具有很好的相关性,这也印证了Ia和1.0s谱加速度与砂土液化的相关性。
Arias Intensity is a ground motion parameter that contains amplitudes,frequencies,and duration of ground motion.It is more reliable in some predictions of seismic damage than the parameters that only depend on the amplitude of ground motion.Scientists have shown that Arias Intensity has a strong correlation with landslides induced by earthquakes.This study presents a preliminary probabilistic seismic hazard assessment in terms of the Arias Intensity in Danling County,Sichuan Province using a seismic source model and the seismicity model established by the Seismic Ground Motion Parameters Zonation Map of China.The results show that the Ia value for most of Danling County and its surrounding area is above 0.11 m/s.Some parts of the area has a value of 0.32 m/s.Some even has more than 0.54 m/s,where a relatively high hazard of earthquake-induced landslides can be found.Hence,we should strengthen the risk assessment of earthquake-induced landslides in personnel concentration areas.An obvious difference is found in the calculation of the Iadistribution according to different Iaprediction equations.Therefore,we should consider more than one Ia prediction equation when calculating the Ia value.The weighted average of the final results is derived to reduce the uncertainty of the Iavalue.We also find a strong correlation between Iaand spectral acceleration（t=1.0 s）,which confirm the correlation between sand liquefaction and Ia.
作者
李雪婧
吴健
高孟潭
徐伟进
LI Xuejing, WU Jian, GAO Mengtan, XU Weijin(Institute of Geophysics, China Earthquake Administration, Beijing 100081, Chin)
出处
《地震工程学报》
CSCD
北大核心
2018年第3期555-561,共7页
China Earthquake Engineering Journal
基金
中国地震局地球物理研究所基本业务专项(DQJB18B27)
国家科技支撑计划项目(2015BAK18B01)
地震行业专项(201508010)
关键词
丹棱县
概率地震危险性
阿里亚斯烈度
谱加速度
Danling county
probabilistic seismic hazard
Arias intensity
spectral acceleration
