This paper presents an analysis of the Hooskanaden Landslide, an earthflow, which experienced a dramatic surge event beginning on February 24, 2019, closing US Highway 101 near mile point 343.5 for nearly 2 weeks. This ~ 1 km long surge event resulted in horizontal displacements of up to 45 m and uplift of 6 m at the toe located on a gravel beach adjacent to the Pacific Ocean. The Hooskanaden Landslide, likely active since the eighteenth century, exhibits regular activity with a recurrence interval of major surge events of approximately every 20 years, transitioning from slow to relatively rapid velocities. During the 2019 event, maximum displacement rates of approximately 60 cm/h were observed, slowly decreasing to 15 cm/h for a sustained period of approximately 2 weeks before the eventual return to baseline conditions (< 0.02 cm/h).

中文翻译：

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Hooskanaden 滑坡：俄勒冈海岸活跃地流的历史和近期涌流行为

本文介绍了对 Hooskanaden 滑坡的分析，该滑坡在 2019 年 2 月 24 日开始经历了剧烈的激增事件，导致美国 101 号高速公路在 343.5 英里点附近关闭了近 2 周。这个约 1 公里长的浪涌事件导致位于太平洋附近的砾石海滩上的脚趾水平位移高达 45 m，并在脚趾处隆起 6 m。Hooskanaden 滑坡可能自 18 世纪以来一直活跃，表现出规律性的活动，大浪涌事件的复发间隔大约每 20 年一次，从缓慢的速度过渡到相对较快的速度。在 2019 年的事件中，观察到最大位移速率约为 60 厘米/小时，在最终返回基线条件（< 0.02 厘米/小时）之前，持续约 2 周的持续时间缓慢下降至 15 厘米/小时。