Abstract—Volcanic eruptions belong to the extreme events that change the Earth’s landscape and affect global climate and environment. Although special attention is given to super-eruptions, the non-explosive rhyolitic (highly viscous) eruptions and large lava flows are no less important. In this paper, we study an ancient lava flow with a volume of ~50 km³ in the Summit Lake region, ​​Yellowstone, which is one of the best studied large intraplate igneous provinces. We develop three-dimensional (3D) numerical models of isothermal lava flow to analyze the influence of the underlying surface and lava flow viscosity on the advancement and duration of the flow. The modeled dynamics of flow propagation fairly well agrees with the measured values provided that the average angle of inclination of the underlying surface slightly differs from the present-day value (by ~1.3°) presumably due to the pressure change in the magma chamber during the eruption. With the increase in lava viscosity, the flow slows down and its thickness increases leading to a change in the flow morphology.

摘要—火山爆发属于极端事件，这些事件改变了地球的景观并影响了全球气候和环境。尽管对超级喷发给予了特别关注，但非爆炸性流纹岩（高粘性）喷发和大量熔岩流同样重要。在本文中，我们研究了〜50 km ³的古代熔岩流。在萨米特湖地区的黄石公园，这是对板内火成岩大省研究最多的地区之一。我们开发了等温熔岩流的三维（3D）数值模型，以分析下层表面和熔岩流粘度对流动的进展和持续时间的影响。流动传播的动力学模型与测量值非常吻合，但前提是下垫面的平均倾斜角与当前值略有不同（约1.3°），这可能是由于在测量过程中岩浆室中的压力发生了变化。喷发。随着熔岩粘度的增加，流量变慢，其厚度增加，导致流量形态发生变化。