Simulation of Earthquake Motion Phase considering Its Fractal and Auto-covariance Features

Simulation of Earthquake Motion Phase considering Its Fractal and Auto-covariance Features
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考虑分形和自协方差特征的地震运动相位模拟

DOI:
10.1007/s12205-019-0348-z
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发表时间:
2019-08
影响因子:
2.2
通讯作者:
Zhao Lei
Zhao Lei
中科院分区:
工程技术4区
文献类型:
--
作者:
Abdelrahman Adam A;Sato Tadanobu;Wan Chunfeng;Zhao Lei

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地震运动相位(EMP)被分解为线性延迟和波动部分。本文讨论了相位波动部分(FPP)特有的随机特性。首先,我们通过使用几个观测到的地震运动时程证明FPP具有自相似性,并且应该表示为分形随机过程,并且FPP在频域具有长期记忆。此外,还讨论了使用简单分数布朗运动 (fBm) 模拟 FPP 的可能性,并得出结论认为这是不可能的。为了克服这个问题,我们开发了一种新的随机过程,即改进的 fBm,它能够模拟随机严格的样本 FPP。这种新开发的算法很好地代表了观测到的电磁脉冲的相位特征。
The earthquake motion phase (EMP) is decomposed into linear delay and fluctuation parts. In this paper, the peculiar stochastic characteristics of the fluctuation part of the phase (FPP) are discussed. First, we show that the FPP has self-afSne similarity and should be expressed as a fractal stochastic process by using several observed earthquake motion time histories, as well as the FPP has a long term memory in the frequency domain. Moreover, the possibility of simulating FPP using the simple fractional Brownian motion (fBm) is discussed and conclude that this is not possible. To overcome this problem, we develop a new stochastic process, the modified fBm that is able to simulate a stochastically rigorous sample FPP. This newly developed algorithm represents the phase characteristics of the observed EMP well.
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