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STRONG MOTION VERSUS WEAK MOTION: IMPLICATIONS FOR MICROZONATION STUDIES

机译:强运动与弱运动:对微区化研究的启示

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摘要

A set of mainshock and aftershock data following the Chamoli earthquake of March 29, 1999, recorded at a single station viz. Gopeshwar, has been studied. Particularly, the utility of the use of aftershock/weak motion data for site characterisation in seismic microzonation studies is investigated. The analysis of aftershock and mainshock data indicates that the spectral shape and amplification is quite different during the main-shock and the aftershock. This, in turn, implies that the use of weak motion/aftershock records may lead to erroneous conclusions regarding the expected ground motion during a strong earthquake. Further, it has been shown that the site characteristics estimated from H/V ratios are not stable in the near field conditions, even for weak motion data.
机译:1999年3月29日Chamoli地震后的一组主震和余震数据,记录在一个站点上。 Gopeshwar,已被研究。特别是,研究了将余震/弱运动数据用于地震微区划研究中场地表征的实用性。对余震和主震数据的分析表明,在主震和余震过程中,频谱形状和放大率有很大不同。反过来,这意味着使用弱运动/余震记录可能会导致关于强地震期间的预期地面运动的错误结论。此外,已经表明,即使对于弱运动数据,从H / V比估计的位点特性在近场条件下也不稳定。

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