考虑现场条件的日本浅层地壳和上地幔地震水平位移谱阻尼修正因子预测模型

IF 2.6 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Lili Kang, Yanxu Jiang, Hao Wu, John X. Zhao
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引用次数: 0

摘要

摘要本文研究了日本浅层地壳和上地幔地震强震记录水平分量的阻尼修正因子(DMFs)。该模型可用于缩放与已知震级和破裂距离无关的5%阻尼设计谱,以获得具有理想阻尼比的设计谱。我们之前的研究表明,场地对DMF的影响是显著的,我们使用场地类别作为场地效应参数。我们用自然对数尺度的阻尼比二次函数来模拟阻尼比的影响,用自然对数谱周期的四阶多项式来表示谱周期大于0.06 s时谱周期的影响。事件间、场地间和场地内的标准差可以用自然对数尺度的阻尼比的线性函数来描述。在许多光谱周期内,事件间标准差小于事件内标准差,站点间标准差小于站点内标准差。利用本文的DMF模型对5%阻尼位移谱进行标度,可以得到合理的位移谱。三种地震的DMF值在许多谱期的差异是中等的,本研究预测的DMF值在某些谱期与其他研究的预测值相似,但在其他谱期差异较大。DMF值的变化趋势表明,在大于5.0 s的光谱周期内,预测的DMF值可能达到理论值1.0。残差分布分析表明,震级和断层顶深度的双线性函数可用于情景地震模型。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A Damping Modification Factor Prediction Model for Horizontal Displacement Spectrum from Shallow Crustal and Upper-Mantle Earthquakes in Japan Accounting for Site Conditions
ABSTRACT This article presents damping modification factors (DMFs) for the horizontal component of the strong-motion records generated by the shallow crustal and upper-mantle earthquakes in Japan. This model can be used to scale a 5% damped design spectrum that does not associate with a known magnitude and rupture distance to obtain a design spectrum with the desirable damping ratios. Our previous study suggested that the site effect on DMF was significant, and we used site class as the site-effect parameter. We used a quadratic function of damping ratio in a natural logarithm scale to model the effect of damping ratios and we used fourth-order polynomials of the natural logarithm spectral period to present the effect of the spectral period when the spectral period is over 0.06 s. The between-event, between-site, and within-site standard deviations can be described by the linear function of the damping ratio in a natural logarithm scale. The between-event standard deviations are smaller than the within-event standard deviations and the between-site standard deviations are less than the within-site ones at many spectral periods. Reasonable displacement spectra can be obtained by using the DMF model from this study to scale the 5% damped displacement spectra. The differences in the DMF values from the three types of earthquakes are moderate at many spectral periods and the predicted DMF values from this study are similar to those from other studies at some spectral periods, but the differences are considerable at the other spectral periods. The variation trend of the DMF values suggests that the predicted DMF values may reach the theoretic value of 1.0 at some spectral periods over 5.0 s. Residual distribution analysis suggested that the bilinear function of magnitude and fault-top depth can be used in a model for scenario earthquakes.
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来源期刊
Bulletin of the Seismological Society of America
Bulletin of the Seismological Society of America 地学-地球化学与地球物理
CiteScore
5.80
自引率
13.30%
发文量
140
审稿时长
3 months
期刊介绍: The Bulletin of the Seismological Society of America, commonly referred to as BSSA, (ISSN 0037-1106) is the premier journal of advanced research in earthquake seismology and related disciplines. It first appeared in 1911 and became a bimonthly in 1963. Each issue is composed of scientific papers on the various aspects of seismology, including investigation of specific earthquakes, theoretical and observational studies of seismic waves, inverse methods for determining the structure of the Earth or the dynamics of the earthquake source, seismometry, earthquake hazard and risk estimation, seismotectonics, and earthquake engineering. Special issues focus on important earthquakes or rapidly changing topics in seismology. BSSA is published by the Seismological Society of America.
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