| 山西原平4．2级地震山西数字强震动记录分析 |
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| 引用本文： | 徐扬,赵向佳.山西原平4．2级地震山西数字强震动记录分析[J].山西地震,2009(1):18-20. |
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| 作者姓名： | 徐扬 赵向佳 |
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| 作者单位： | 山西省地震局,山西,太原,030021;太原大陆裂谷动力学国家野外科学观测研究站,山西,太原,030025 |
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| 摘 要： | 对2009年3月28日山西原平4．2级地震山西数字强震动台网7个台的地震加速度记录进行了处理和分析，包括对加速度波形数据的基线校正、滤波、水平分向矢量合成以及部分台站速度计算（包括水平向速度矢量合成）和加速度付氏谱、反应谱计算。结果表明：记录的最大单分向（水平）加速度峰值为27．5cm／s^2，水平合成最大加速度PGAn为28．5cm／s^2，其折合地震烈度为5度。多数台站的垂直向加速度峰值大约为水平向的1／2。最大速度峰值PGVH为0．51cm／s。原平台加速度记录的谱分析表明，对于4～5级这样强度的地震，因为震源本身产生的地震波中的长周期成分很少，所以，厚覆盖土层对长周期地震波的影响在工程的意义上可以忽略。
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| 关 键 词： | 强震动记录 山西原平4.2级地震 峰加速度 谱分析 |
Analysis on Records of Shanxi Digital Strong Motion Network for Yuanping M4.2 Earthquake, Shanxi |
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| XU Yang,ZHAO Xiang-jia.Analysis on Records of Shanxi Digital Strong Motion Network for Yuanping M4.2 Earthquake, Shanxi[J].Earthquake Research in Shanxi,2009(1):18-20. |
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| Authors: | XU Yang ZHAO Xiang-jia |
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| Institution: | XU Yang, ZHAO Xiang-jia ( 1. Earthquake Administration of Shanxi Province, Taiyuan 030021, China ; 2. National Continental Rift Valley Dynamics Observatory of Taiyuan, Taiyuan 030025, China) |
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| Abstract: | Earthquake acceleration records of 7 stations of Shanxi digital strong motion network for the 28 Mar. 2009, M4.2 Yuanping, Shanxi, earthquake are processed and analyzed in this paper, including baseline correlation, filtering, vector composition of horizontal components of acceleration wave data. Also, acceleration Fourier spectra, response spectra and velocities （including horizontal velocity vector composition） of parts of stations are calculated. The results indicate that the recorded acceleration peak of single horizontal component is 27.5 cm/s^2, and the peak of horizontal acceleration composition , PGAH, is 28.5 cm/s^2, equivalent to seismic intensity 5. For most stations, the vertical acceleration peaks are about the half of that of the horizontals. The velocity peak PGVH is 0. 51 cm/s. The spectra analysis of acceleration recorded in Yuanping station indicates that the long-frequency components of the seismic wave produced by the source itself is very small for earthquakes with magnitudes of 4-5, so the influence of thick sediment on long-frequency seismic waves can be ignored in engineering applications. |
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| Keywords: | strong motion record Yuanping M4 2 earthquake in Shanxi peak acceleration seismic spectral analysis |
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