Source, path and site effects on dominant frequency and spatial variation of strong ground motion recorded by SMART1 and SMART2 arrays in Taiwan
Source, path and site effects on dominant frequency and spatial variation of strong ground motion recorded by SMART1 and SMART2 arrays in Taiwan
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台湾SMART1和SMART2阵列记录的强地震动主频率和空间变化的震源、路径和场地效应
DOI：
10.1002/eqe.4290230602
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发表时间：
1994
影响因子：
4.5
通讯作者：
Y. Yeh
中科院分区：
文献类型：
--
作者：
I. Beresnev;K. Wen;Y. Yeh
近年来有研究表明，强震地面运动的空间方差随震级的增大而减小。然而，我们发现，所观察到的空间方差对震级的依赖性是其隐含的依赖于波场的频率内容（主频）。本文利用多对加速度记录的时域互相关来量化地震波的空间变化。震级是影响主频率的因素之一。我们尝试分别研究震级、震源距、峰值加速度和震源深度对地震主频的影响，找出最显著的影响。本资料库由台湾地区148个地方地震的1965个水平加速度记录组成。分析表明，震源震级对主频率的形成具有压倒性的影响，其经验关系为：
震源距离，当地的加速度幅度或深度没有显着的影响，检测到其所有可用的值（高达170公里，250厘米/秒2，和100公里，分别）。震级对主频的普遍影响是一致观测到的地震动空间方差随震级增加而减小的真实的原因。
The reduction in spatial variance of strong ground motion with increasing earthquake magnitude has been reported recently. However, we show that the observed dependence of spatial variance on magnitude is its implicit dependence on the frequency content (dominant frequency) of the wave field. Time-domain cross-correlations of pairs of accelerograms are used to quantify the spatial variations in this paper. Magnitude is one of the factors contributing to the dominant frequency. We attempt to study separately the effects of magnitude, hypocentral distance, peak ground acceleration and focal depth on the dominant frequency in order to find the most significant one. The data base consists of 1965 records of horizontal acceleration from 148 local earthquakes in Taiwan. The analysis shows the overwhelming effect of the source magnitude on the formation of the dominant frequency with an empirical relationship:
No significant effect of hypocentral distance, local acceleration amplitude or depth is detected for all their values available (up to 170 km, 250 cm/s2, and 100 km, respectively). The prevailing effect of magnitude on the dominant frequency is a real cause of the consistently observed reduction of spatial variance of ground motion with increasing magnitude of earthquakes.
DOI：
--
发表时间：
1985
期刊：
--
影响因子：
--
作者：
I. M. Idriss
通讯作者：
I. M. Idriss