| Popis: |
Hawaiian and Strombolian eruption styles are characteristic of silica-poor, low viscosity magmas and represent the most frequent manifestations of explosive volcanism on Earth. In these eruption styles, the violent release of relatively large volumes of magma decoupled from the melt ejects coarse, still molten pyroclasts. Strombolian eruptions involve the complex bursting of gas pockets at the volcanic vent, while Hawaiian eruptions are best described as the fountaining of sustained jets of gas and fluidal pyroclasts. Transitions between these two styles and their variations are linked to the amount and chemical composition of the magmatic gases that drive the eruptions and to the way gas pockets segregate from the magma and migrate along the volcanic conduit, also a function of magma physical properties and conduit geometry. Each style is also characterized by a specific infrasonic signature, which can be used to measure the gas pockets and deduce their origin and evolution. |
