Effects of earthquake spatial slip correlation on variability of tsunami potential energy and intensities
Effects of earthquake spatial slip correlation on variability of tsunami potential energy and intensities
复制标题
地震空间滑移相关性对海啸势能和强度变化的影响
作者：
J. Crempien;A. Urrutia;R. Benavente;R. Cienfuegos
海啸发生的变异性特征是正确评估灾害的关键。为了这个目的，我们隔离的变异性，它仅仅源于地震空间源的复杂性，通过模拟海啸淹没在近场与简化的数字高程模型，使用非线性浅水方程。对于地震破裂，我们规定滑动具有对数正态概率分布函数和每个子断层对之间的冯卡门相关性，我们假设随着它们之间的欧几里得距离的增加而减小。从所产生的近场淹没时间序列，从几千个合成滑实现跨越9级地震，我们提取几个海啸强度措施在海岸。结果表明，所有考虑的海啸强度的措施和潜在的能量变异性增加的空间滑动相关性。最后，我们表明，较大的空间滑动相关性产生较高的海啸强度测量的近场内，这突出了需要量化的地震空间滑动相关性的不确定性的概率。
Variability characterization of tsunami generation is quintessential for proper hazard estimation. For this purpose we isolate the variability which stems solely from earthquake spatial source complexity, by simulating tsunami inundation in the near-field with a simplified digital elevation model, using nonlinear shallow water equations. For earthquake rupture, we prescribe slip to have a log-normal probability distribution function and von Kármán correlation between each subfault pair, which we assume decreases with increasing euclidean distance between them. From the generated near-field inundation time-series, emanating from several thousand synthetic slip realizations across a magnitude 9 earthquake, we extract several tsunami intensity measures at the coast. Results show that all considered tsunami intensity measures and potential energy variability increase with increasing spatial slip correlations. Finally, we show that larger spatial slip correlations produce higher tsunami intensity measure exceedance probabilities within the near-field, which highlights the need to quantify the uncertainty of earthquake spatial slip correlation.