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强震加速度记录中50点采样与200点采样之间的差别有多大,能否用50点记录代替200点记录,本文从49组200点记录中采取高通滤波的方法抽取成49组50点的记录,通过最大值对比、加速度时程对比、功率谱对比及滤波后两组数据的相关性共4个方面进行分析研究,发现滤波后的最大值比200点原始记录最大值平均小79.82 Count是原始记录的0.672%,加速度时程方面几乎没有什么差别,功率谱对比方面发现从0.4~90Hz之间谱曲线基本重合,而在该频段以外两端悬殊较大,最后,通过对6组200点与50点数据的相关分析后发现,其平均相关系数达到88%以上。 相似文献
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强烈地震动的计测称之为强震观测。强震观测不仅记录大地震的走时过程,而且还测到具有广义强震观测的强地震动的最大值和计测烈度。强震观测在经历阪神大震灾后10年期间有了很大的变化,取得引人注目的进展和成果。 相似文献
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1996年2月28日宜宾5.4级地震的宏观震中位于永兴镇,震中烈度达Ⅶ度,地震等烈度线呈长轴为北东向的椭圆状分布,震区总面积约150平方公里,这次地震共造成1人死亡,地震总经济损失为5261万元。 相似文献
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简要评述了现有强震记录仪器响应失真校正方法的优点和存在的不足。在文献[1]的基础上,提出了对强震记录进行仪器响应失真校正的权函数方法,并推导建立了相应的计算公式。通过设计真实地震动为已知的算例,对加速度摆和速度摆强震仪的未校正记录,和用不同方法获得的校正记录的精度(或误差)进行了对比分析。理论和算例分析表明,本文方法简单、实用,具有很高的计算机精度且无稳定性问题。 相似文献
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强震观测资料包括强震动时程记录资料和宏观震害调查资料两大类, 前者是定量的微观数据, 后者则是定性的宏观指标. 本文明晰给出了微观仪器烈度与宏观仪器烈度、 微观考察烈度与宏观考察烈度的概念, 并在此基础上提出了只有在宏观仪器烈度与宏观考察烈度之间进行比较才具有实质性的意义;同时对国内外常见的仪器烈度算法进行了比较性研究, 得出了袁一凡仪器烈度算法可靠性更高的结论;最后以四川地区历年来重要震例的强震动记录为依据, 对修正的袁一凡仪器烈度算法的可靠性进行了比较应用. 结果表明, 对袁一凡仪器烈度算法修正与扩展的应用是可行的, 同时也验证了将微观仪器烈度与宏观考察烈度直接进行比较会存在较大的差距. 相似文献
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地震动强度与地震烈度速报研究 总被引:17,自引:2,他引:17
本在总结了美、日等国家和我国大陆与台湾地区基于实时或近实时强震台网的地震动强度(烈度)速报方法的基础上,对我国地震动强度(烈度)速报及计算机软件编制中的关键技术问题进行了讨论。 相似文献
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何少林 《地震地磁观测与研究》2003,24(5):53-56,63
对Etna固态存储数字强震仪记录的2001年7月7日天祝ML4.4地震的加速度记录进行了分析处理,对仪器响应和基线进行了校正,计算了速度和位移时程曲线及各种谱值,并对记录特点做了总结。 相似文献
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基于假设检验的地震动强度(烈度)速报方法 总被引:3,自引:0,他引:3
地震发生后数分钟内,快速、可靠地判别出地震动强度(烈度)的空间分布,用以估计不同地区的受灾程度,可以为政府开展应急救援并合理分配救援力量提供决策依据,保证救援人员及时、准确地到达极震区并展开搜救,以减少生命财产损失。本文基于统计学中的假设检验方法,对历史震害资料进行统计,提出了一种利用强地震动参数判别地震动强度(烈度)的方法。比较结果表明,本方法所确定的地震动强度(烈度)与实际震害烈度对应较好,能较真实地反映实际震害情况。 相似文献
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The Japan Meteorological Agency (JMA) seismic intensity (IJMA) has been used as a measure of strong shaking for many years in Japan, and it necessitates to know the correlation between the JMA seismic intensity and other strong motion indices, e.g. Peak Ground Acceleration (PGA), Peak Ground Velocity (PGV), and Spectrum Intensity (SI). In this study, two strong motion data sets were selected; in which, the first set consists of 879 three‐components non‐liquefied records selected from 13 major earthquake events that occurred in Japan, the United States, and Taiwan, and the second set consists of 17 liquefied records selected from 7 major earthquake events that occurred in Japan and the United States. The JMA seismic intensity and other ground motion indices were calculated using the selected data sets. The relationships between the JMA seismic intensity and PGA, PGV, and SI were then derived performing a two‐stage linear regression analysis. Results from the analysis show that the JMA instrumental seismic intensity shows higher correlation with SI than PGA or PGV, and it shows the highest correlation with the parameters such as the combination of PGA and SI or the product of PGA and SI. The obtained relationships are also compared with the ones obtained by other studies, which may be useful for the disaster management agencies in Japan and deployment of new SI‐sensors that monitor both PGA and SI. Copyright © 2002 John Wiley & Sons, Ltd. 相似文献
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破坏性地震发生后, 特别是在通信中断的情况下, 利用仪器烈度快速估计地震动强度(烈度)的分布情况, 可为开展最有效的地震应急救援提供决策依据. 该文介绍了现有的几种仪器烈度算法, 并利用汶川地震与芦山地震中获得的强震加速度记录对各种算法的可靠性进行了比较. 结果表明, 在这两次地震中只利用地震动峰值参数确定仪器烈度的算法可靠性较低, 而考虑反应谱特性的算法可靠性更高. 在未得到更多强震数据的检验前, 建议采用袁一凡提出的仪器烈度算法, 或利用谱烈度值确定仪器烈度的算法, 或利用加速度反应谱值确定仪器烈度的算法. 相似文献
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本文以美国加州3次破坏性地震和2008年中国汶川Ms8.0地震中所获得的强震记录作为数据源,应用最小二乘法进行线性回归,得到了不同地震动参数与烈度间的相关性.统计发现,在地面加速度峰值、地面速度峰值等16种描述地震动强度的参数中,烈度识别正确率及相关性最好的两个参数分别是标准累积绝对速度和谱烈度. 相似文献
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Maria I. Todorovska Elena I. Novikova Mihailo D. Trifunac Sanja S. Ivanovi 《地震工程与结构动力学》1998,27(10):1053-1068
Results are presented of recent sensitivity calibration of 76 accelerographs (SMA-1) of the Los Angeles Strong Motion Array. These have pendulum-like transducers and optical recording system. One characteristic of their design is off-axis sensitivity, which is magnified by transducer misalignment. A new calibration procedure was applied, which considers off-axis sensitivity and measures the angles of misalignment (φ and ψ), as well as the incident angle of the light beam onto the film (θ0). These are required (1) for accurate estimation of sensitivity, and (2) for proper instrument correction of recorded accelerograms which considers also cross-axis sensitivity and misalignment. These effects are important near large acceleration peaks (approaching and exceeding 1g), e.g. like the ones recorded near the source of the 1994 Northridge earthquake (ML=6·4). This earthquake was recorded by 65 stations of the Los Angeles Strong Motion Array, at epicentral distances from 2 to 85 km. Histograms showing distribution of the misalignment angles, light beam incidence angle θ0 (for unloaded position) and the transducer sensitivities are presented. These indicate that the misalignment angles are typically 1–1·5°, but may also be 3–4°. Angle θ0 (usually neglected), is mostly between ±8°, but may reach ±12°. Assuming θ0=0 leads to systematically smaller values of the measured sensitivity (e.g. by ∼3% for θ0=8° and ∼4% for θ0=12°). Comparison of the newly measured sensitivities with those measured prior to installation (in 1979/1980), sold, shows that, in general, the new values are systematically smaller. The difference is typically within 5 per cent, but in some cases is as large as 10 per cent. Other principal sources of the observed differences and their mechanisms are discussed. Those include long-term changes in the transducers (e.g. change of stiffness, reflected in changes of the natural frequency) and differences in the calibration procedure (e.g. errors associated with manual reading film records with tilt test data, and with transducer and instrument housing misalignment). The presented results may be considered typical of similar strong motion arrays worldwide. © 1998 John Wiley & Sons, Ltd. 相似文献
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强震及工程震害基础资料数据库地理信息系统研究 总被引:6,自引:0,他引:6
基于MapInfo软件开发平台,建立了强震和工程震害空间数据库,对产生数据误差的来源进行分析和提出控制误差的方法,设计并实现了强震及工程震害数据地理信息系统,该系统界面主要用于Internet服务的后台图形制作,并为用户提供强震及震害数据的地理信息查询服务。 相似文献