arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2011.09038physics.geo-phcs.LGstat.ML
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使用深度生成模型的数据驱动的流程图合成

Data-driven Accelerogram Synthesis using Deep Generative Models

California Institute of Technology(加州理工学院)

Manuel A. Florez, Michaelangelo Caporale, Pakpoom Buabthong, Zachary E. Ross, Domniki Asimaki, Men-Andrin Meier

摘要:

对假想地震产生的地面运动进行稳健估计对于许多工程应用是至关重要的。我们利用生成对抗网络(GANs)的最新进展来开发一个新的框架来合成地震加速度时程。我们的方法扩展了Wasserstein的GAN制定允许地面运动的条件下,一组连续的物理变量的产生。我们的模型被训练来近似来自日本的大量强震记录的固有概率分布。我们表明,经过训练的生成器模型可以合成逼真的3分量加速度图的条件的幅度,距离,和$V_{s30}$。我们的模型捕捉到了加速度谱和波形包络的预期统计特征。输出的地震图显示了清晰的P波和S波到达,具有适当的能量含量和相对起始时间。合成的峰值地面加速度(PGA)的估计也与观察一致。我们开发了一组指标,使我们能够评估训练过程的稳定性并调整模型超参数。我们进一步表明,训练过的生成器网络可以插值到没有地震地面运动记录的条件。我们的方法允许按需合成的加速度为工程目的。

英文摘要:

Robust estimation of ground motions generated by scenario earthquakes is critical for many engineering applications. We leverage recent advances in Generative Adversarial Networks (GANs) to develop a new framework for synthesizing earthquake acceleration time histories. Our approach extends the Wasserstein GAN formulation to allow for the generation of ground-motions conditioned on a set of continuous physical variables. Our model is trained to approximate the intrinsic probability distribution of a massive set of strong-motion recordings from Japan. We show that the trained generator model can synthesize realistic 3-Component accelerograms conditioned on magnitude, distance, and $V_{s30}$. Our model captures the expected statistical features of the acceleration spectra and waveform envelopes. The output seismograms display clear P and S-wave arrivals with the appropriate energy content and relative onset timing. The synthesized Peak Ground Acceleration (PGA) estimates are also consistent with observations. We develop a set of metrics that allow us to assess the training process's stability and tune model hyperparameters. We further show that the trained generator network can interpolate to conditions where no earthquake ground motion recordings exist. Our approach allows the on-demand synthesis of accelerograms for engineering purposes.

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