High-frequency directivity in strong ground motion modeling methods
High-frequency directivity in strong ground motion modeling methods
复制标题
强地面运动建模方法中的高频方向性
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
J. Burjánek
中科院分区：
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作者：
F. Gallovič;J. Burjánek
我们正在研究两种不同的强地面运动模拟技术，就其高频方向性：i）的复合模型与分形子事件的大小分布，基于经验绿色函数的求和方法，和ii）的积分模型与k平方滑移模型与k相关的上升时间，基于表示定理。我们测试模拟在一个一维层状地壳模型对经验PGA衰减关系，特别是关于他们的不确定性，所描述的标准差（σ）。我们假设任何一个特定地震的合成模型不应该提供一个PGA散射大于一个大的地震集的观察到的散射。1999年雅典地震（Mw = 5.9）作为一个测试的例子。在复合方法中，合成数据显示出在经验平均值周围小于±2σ的散布。k平方法显示出更大的散射，表现出很强的高频方向性。它表明，后者可以减少通过引入一个正式的频谱修改。
We are investigating two distinct strong ground motion simulation techniques as regards their high-frequency directivity: i) the composite model with a fractal subevent size distribution, based on the method of summation of empirical Green’s functions, and ii) the integral model with the k-squared slip model with k-dependent rise time, based on the representation theorem. We test the simulations in a 1D layered crustal model against empirical PGA attenuation relations, particularly with regard to their uncertainty, described by the standard deviation (σ). We assume that any synthetic model for a particular earthquake should not provide a PGA scatter larger than the observed scatter for a large set of earthquakes. The 1999 Athens earthquake (Mw = 5.9) is studied as a test example. In the composite method, the synthetic data display a scatter of less than ±2σ around the empirical mean. The k-squared method displays a larger scatter, demonstrating strong high-frequency directivity. It is shown that the latter can be reduced by introducing a formal spectral modification.
Sawada, Y.：“日本西南部山阴地区白垩纪至中新世火成岩的 Nd-Sr 系统学。”
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