Along subduction zones, which mechanism primarily controls variability in explosive volcanic eruption intensity?

💡 Explanation

Along subduction zones, higher magma silica content increases viscosity, trapping gases like water vapor and CO2. This increases pressure leading to more explosive eruptions due to rapid decompression. Therefore, magma's silica content and gas quantity directly influence eruption intensity, rather than plume temperature, rock density profile or sediment compaction.

• Which mechanism amplifies atmospheric subsidence during an El Niño event in the eastern Pacific?
• Which topographic feature is primarily formed by the mechanism of solifluction in periglacial environments?
• Which soil consequence results when increased water runoff accelerates weathering?
• Which phenomenon causes uplift and subsidence flanking strike-slip faults during rupture events?
• Which outcome is observed after subduction ceases completely?
• Which outcome is directly amplified when decreased Arctic ice cover reduces the Earth's albedo?