What is the potential role of lower mantle structures in the origin of plumes?

Jan 1, 2020 ... We examine swell bathymetry and island drowning at 14 hotspots and find a correspondence between island lifespan and residence time atop swell bathymetry. A volcanic "hotspot" is an area in the mantle from which heat rises as a thermal plume from deep in the Earth. High heat and lower pressure at the base of the ... ... hotspot volcanic islands that are remote from subducting plate boundaries. This has been driven by the very successful development of geothermal resources ... 2. How does magma get to the Earth's crust to create a hotspot volcano? · Magma travels to Earth's surface through an upward tunnel from deep within Earth. Hotspots are places where the magma rises up through the crust. They are caused by a static source of magma, often away from plate margins. As the plate moves ... The Hawaiian Islands are the youngest volcanic mountains in a long chain of volcanoes that formed over a hotspot. They are still forming today. Another hot spot ... Sep 5, 2013 ... Scientists at UC Berkeley have detected previously unknown channels of slow-moving seismic waves in Earth's upper mantle, a discovery that helps ... Oct 23, 2024 ... A global study of lavas from volcanic hot spots suggests that contrary to accepted wisdom, Earth's deep mantle may have the same composition ... Sep 5, 2013 ... image: This is a map view of seismic shear-wave speed in the earth's upper mantle, highlighting the slow wave-speed channels (warm colors) ... Jan 1, 2020 ... Island lifetime depends on the rate and magnitude of island subsidence, which, in turn, depends on the dynamics of the oceanic lithosphere and ...