A bathymetric survey of Harrison Lake in southwest British Columbia revealed deposits of three large landslides on the lake floor. The blocky and flow-like surface morphology of the deposits suggests rapid emplacement from subaerial sources. The multibeam survey, together with a subbottom acoustic survey, allowed us to estimate deposit volumes of 2.4 Mm3, 1.3 Mm3, and 0.2 Mm3 for the Mount Douglas, Mount Breakenridge, and Silver Mountain landslides, respectively. The large volumes and inferred rapid emplacement of the Mount Douglas and Mount Breakenridge landslides suggest they were tsunamigenic. Because people live along the shoreline of Harrison Lake, our discovery and characterization of these landslide deposits and their tsunami-generating potential form an important foundation for further landslide-tsunami hazard analysis in the region.

中文翻译：

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加拿大不列颠哥伦比亚省哈里森湖以前未发现的滑坡沉积物

对不列颠哥伦比亚省西南部哈里森湖的测深调查显示，湖底沉积了三个大型滑坡。沉积物的块状和流动状表面形态表明来自地下来源的快速就位。多波束勘测与底部声学勘测一起使我们能够估计道格拉斯山、布雷肯里奇山和银山滑坡的沉积体积分别为 2.4 Mm3、1.3 Mm3 和 0.2 Mm3。道格拉斯山和布雷肯里奇山滑坡的大体积和推断的快​​速就位表明它们是海啸造成的。由于人们居住在哈里森湖的海岸线上，我们对这些滑坡沉积物及其引发海啸的潜力的发现和表征为该地区进一步滑坡-海啸灾害分析奠定了重要基础。