| 永登黄土地区爆破地震动近场效应的研究 |
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| 引用本文： | 林学文.永登黄土地区爆破地震动近场效应的研究[J].西北地震学报,1986,8(2):85-95. |
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| 作者姓名： | 林学文 |
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| 作者单位： | 国家地震局兰州地震研究所 |
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| 摘 要： | 一.前言不同场地条件下的强震记录,不仅对开展地震地面运动研究很重要,而且对地震工程和工程抗震等方面的研究也极为重要。但是,由于破坏性地震发生的机率及当前地震预报的水平所限,要取得理想的强震记录很困难,尤其是取得主震的近场记录更为困难。因此利用人工手段模拟天然地震,从而取得强震地面运动的各种资料,是一种比较好的办法。虽然人工地
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STUDY ON GROUND MOTION NEAR SOURCE BY BLAST EXCITATION IN YONGDENG LOESS REGION |
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| Lin Xuewen.STUDY ON GROUND MOTION NEAR SOURCE BY BLAST EXCITATION IN YONGDENG LOESS REGION[J].Northwestern Seismological Journal,1986,8(2):85-95. |
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| Authors: | Lin Xuewen |
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| Institution: | Lanzhou Seismological Institute of Lanzhou, State seismological Bureau |
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| Abstract: | Study on ground motion by blast excitation in the bedrock region has been carried out in China, but the similar study not in the loess regions. Up to now, we have not any data near source about earthquake effects during blast in the loess regions. Using a blast Work, the decay regularity of ground motion and the effects of topography and geonmorphy on the ground motion were studied in this paper. The comparative study on the ground microtremors characteristic and loess soil properties before and after the blast was carried out too.The results were obtained that the blast ground motion decay regularity is very similar to that of the natural earthquake ground motion, and if the acceleration develops up to some value, the loess will be failure, and that acceleration(peak-peak)is approximatively equal to the intensity grade X (New Intensity Scale of China). The comparative observation at the time after and before blast excitation indicated that the peak value of the spactra were similar, and the dominant period of the spactra ware increased. |
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