地震研究

强震动数据是地震工程和工程地震领域研究的基础,为了便于高效选取强震动记录,基于以下全球强震动开源数据库:美国USGS、欧洲ESM、日本K-NET和KiK-net、墨西哥RAII-UNAM和新西兰GeoNet,收集整理5.0级以上地震的强震动记录40余万组,约150万条,通过震级、台站分布、场地条件、反应谱谱型等强震动基本信息对强震动记录进行筛选并分类,采用两套标准对场地进行了分类,对绝对加速度反应谱进行归一化,对比分析5个国家和地区的平均反应谱谱型的相似性与特殊性,结果表明:①美国强震动台站集中分布在西海岸与阿拉斯加地区,较硬的场地占比较高; ②日本强震动台站分布密度最高,较软的场地占比较高; ③给出了中、美两套规范下的强震动台站场地分类; ④从震中距方面考虑,美国为近场强震动记录最为集中和丰富的国家; ⑤不同国家和地区相同周期段绝对加速度反应谱具有明显的区域性差异。

Strong motion records are the basis for the research in earthquake engineering and engineering seismology.In order to efficiently select strong motion records,we collect and collate more than 400000 sets of(approximately 1.5 million)strong motion records of earthquakes(M≥5.0)from the following global open-source strong motion databases:USGS in the United States,ESM in Europe,K-NET and KiK-net in Japan,RAII-UNAM in Mexico,and GeoNet in New Zealand.Then we screen and classify these strong motion records according to some basic information such as magnitude,station distribution,site conditions,response spectrum shape,etc.In the light of the Chinese standard and the American standard,we classify the sites.We normalize the absolute acceleration response spectra.We compared the average response spectrum shapes in the US,Europe,Japan,Mexico,and New Zealand.The conclusions are as follows:(1)Strong motion stations in the United States are concentrated along the west coast and in Alaska,with a high proportion of hard sites;(2)Japan has the highest density of strong stations,with a high proportion of soft sites;(3)The site classification of strong earthquake stations is obtained according to the Chinese standard and the American standard;(4)Near-field strong motion recordings are mostly centralized and most abundant in the United States;(5)In these countries or region,the absolute acceleration response spectra in the same period have obvious regional differences.

引言
1 强震动数据收集
2 强震动台站分布特征
3 加速度反应谱谱型对比
4 结论

图1 1954—2021年5个国家和地区数据库中5.0级以上地震事件的震中(a)和台站(b)分布<br/>Fig.1 Epicenters(a)and strong motion stations(b)of the selected earthquake events(M>5.0) from database in 4 countries and 1 region from 1954 to 2021

图1 1954—2021年5个国家和地区数据库中5.0级以上地震事件的震中(a)和台站(b)分布
Fig.1 Epicenters(a)and strong motion stations(b)of the selected earthquake events(M>5.0) from database in 4 countries and 1 region from 1954 to 2021

表1 5个国家和地区强震数据库自建库以来采集到的不同震级范围地震事件的数量统计<br/>Tab.1 Magnitude levels of the earthquakes recorded by the strong-ground motion databases in 4 countries and 1 region

表1 5个国家和地区强震数据库自建库以来采集到的不同震级范围地震事件的数量统计
Tab.1 Magnitude levels of the earthquakes recorded by the strong-ground motion databases in 4 countries and 1 region

图2 强震动记录历年数量(a)及累计数量(b)<br/>Fig.2 Annual number(a)and cumulative number (b)of the strong ground-motion records

图2 强震动记录历年数量(a)及累计数量(b)
Fig.2 Annual number(a)and cumulative number (b)of the strong ground-motion records

图3 台站场地类别确定流程<br/>Fig.3 Flowchart for classifying the strong ground-motion stations

图3 台站场地类别确定流程
Fig.3 Flowchart for classifying the strong ground-motion stations

图4 美国(a)、欧洲(b)、日本(c)、墨西哥(d)和新西兰(e)强震动台站场地类别分布<br/>Fig.4 Site classification of the strong ground-motion stations in the US(a),Europe(b),Japan(c),Mexico(d),and New Zealand(e)

图4 美国(a)、欧洲(b)、日本(c)、墨西哥(d)和新西兰(e)强震动台站场地类别分布
Fig.4 Site classification of the strong ground-motion stations in the US(a),Europe(b),Japan(c),Mexico(d),and New Zealand(e)

表2 中国抗震规范下的场地类别占比<br/>Tab.2 Proportion of site categories according to Chinese standards

表2 中国抗震规范下的场地类别占比
Tab.2 Proportion of site categories according to Chinese standards

表3 美国抗震规范下的场地类别占比<br/>Tab.3 Proportion of site categories according to American standards

表3 美国抗震规范下的场地类别占比
Tab.3 Proportion of site categories according to American standards

图5 5个国家和地区开源数据库(a)和美国CESMD数据库(b)强震动记录对应的震中距与震级分布<br/>Fig.5 Epicentral distances and magnitudes calculated based on the strong seismic records from the open-source databases in 4 countries and 1 region(a)and from the US CESMD database(b)

图5 5个国家和地区开源数据库(a)和美国CESMD数据库(b)强震动记录对应的震中距与震级分布
Fig.5 Epicentral distances and magnitudes calculated based on the strong seismic records from the open-source databases in 4 countries and 1 region(a)and from the US CESMD database(b)

图6 5个国家和地区的平均归一化加速度反应谱对比<br/>Fig.6 Average,normalized acceleration response spectrums of 4 countries and 1 region

图6 5个国家和地区的平均归一化加速度反应谱对比
Fig.6 Average,normalized acceleration response spectrums of 4 countries and 1 region

图7 5个国家和地区归一化反应谱及对数均值加减一倍标准差<br/>Fig.7 Normalized acceleration response spectrums and the logarithmic mean±one standard deviation of 4 countries and 1 region

图7 5个国家和地区归一化反应谱及对数均值加减一倍标准差
Fig.7 Normalized acceleration response spectrums and the logarithmic mean±one standard deviation of 4 countries and 1 region

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备注

引言

1 强震动数据收集

2 强震动台站分布特征

3 加速度反应谱谱型对比

4 结论

期刊信息