We simulated tsunami propagation for several scenario slip distributions for the 1938 M_W 8.3 earthquake along the Alaska Peninsula and compared these to the observed records at Unalaska/Dutch Harbor and Sitka. The Sitka record is sensitive to the depth of slip but not the along‐strike location and is fit best by slip at shallow depth. The Unalaska record is sensitive mainly to the along‐strike location of slip and is fit best by slip that is concentrated in the eastern part of the presumed 1938 rupture zone. The tsunami data show that the actual 1938 earthquake rupture zone was likely ∼200 km in length or shorter and had no slip near the Shumagin Islands or in the 2020 Simeonof earthquake's rupture zone. The rupture models that best predict the 1938 tsunami lie within the region of high present day slip deficit inferred from GPS.

中文翻译：

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海啸建模对1938兆瓦8.3阿拉斯加半岛地震的滑动分布的约束

我们针对1938 M _W的几种情景滑动分布模拟了海啸传播沿着阿拉斯加半岛发生8.3级地震，并将其与Unalaska / Dutch Harbour和Sitka的观测记录进行比较。Sitka记录对滑移深度敏感，而对沿走向位置不敏感，最适合浅深度滑移。Unalaska记录主要对滑动沿震的位置敏感，最适合集中在假定的1938年破裂带东部的滑动。海啸数据表明，实际的1938年地震破裂带的长度可能约为200公里或更短，并且在Shumagin群岛附近或2020年Simeonof地震破裂带附近没有滑动。最能预测1938年海啸的破裂模型位于GPS推断出的当前高度滑差的区域内。