Under mid-ocean ridges, where plates are pulling apart, magma can be found as shallow as 5 to 20 kilometers below the seafloor. Tectonic Setting Typical Depth to Magma Example Location Mid-Ocean Ridge 5 – 20 km Mid-Atlantic Ridge Subduction Zone 100 – 150 km Cascadia Subduction Zone Hotspot 50 – 200 km Hawaii Continental Rift 20 – 80 km East African Rift Magma Chambers and Storage Rather than being a continuous river of molten rock, magma often accumulates in discrete pockets known as magma chambers.
Magma in the Upper Mantle Region: Depths and Tectonic Settings
The Role of Heat and Pressure. The planet is divided into the crust, the mantle, and the core.
This molten rock is not a uniform layer but exists in distinct zones, most notably within the asthenosphere, where temperatures and pressures allow for partial melting of rock. Within the upper part of the mantle, conditions are just right for rock to melt, creating the pockets and zones of magma.
Magma in the Upper Mantle Region Beneath Our Feet
Specific Depths and Locations The exact depth of magma varies significantly depending on the tectonic setting. Below the crust lies the mantle, a thick layer of solid rock that behaves in a plastic, flowing manner over long geological timescales.
More About Where is magma located
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