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Large-scale Basement-involved Landslides, California Continental Borderland

机译：涉及加利福尼亚的大规模地下室滑坡

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摘要

Large seafloor relief, shallow metamorphic basement, and seismic activity in the California Continental Borderland combine to produce major submarine slides capable of generating local tsunamis. The Catalina Schist basement complex of the Borderland contains melange units, faults between metamorphic facies, and foliation derived from a history of deep subduction underthrusting and subsequent tectonic exhumation along regional low-angle fault systems. Neogene volcanic and sedimentary rocks covered the exhumed metamorphic basement forming an interface with a strong contrast in material properties. Neogene transtensional block-faulting formed steep escarpments that cut through and elevated the low-angle detachment surface, providing slip surfaces with free faces susceptible to failure along the rheological boundary. Two basement-involved slope failure examples west of San Diego are described, including large block-glides and progressive rotational slumps along the steep northeast-facing Thirtymile Bank escarpment and along the southwest flank of Fortymile Bank.
机译：加利福尼亚大陆边界地区的大型海底浮雕，浅层变质基底和地震活动共同产生了能够产生局部海啸的主要海底滑坡。 Borderland的Catalina Schist地下室群包含混杂单元，变质相之间的断层以及源自沿区域低角度断层系统的深俯冲作用下的俯冲作用和随后的构造回火的历史的页岩。新近纪的火山岩和沉积岩覆盖了发掘出的变质基底，形成了一个界面，在物质属性上形成了强烈的对比。 Neogene张力断层断裂形成了陡峭的悬崖，陡峭的悬崖切穿并抬高了低角度分离面，使滑动面的自由面容易沿流变边界破裂。描述了圣地亚哥以西两个与地下室有关的边坡破坏实例，包括沿着陡峭的东北面的蒂蒂米尔河岸悬崖和蒂蒂米尔河岸西南翼的大型滑坡和渐进式旋转坍塌。

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