Where the mantle bursts through the crust, a plate is formed in the midst of it.
A famous example of a sizable seamount and island chain produced by hot-spot volcanism is the Hawaiian Emperor seamount chain. With a northwesterly direction, the chain's islands or submerged seamounts get older and older.
The Pacific plate, which is migrating north-west, is where the Hawaiian Islands are located. Volcanoes formed there.
The fragile and brittle asthenosphere is covered by lithosphere plates. This also applies to the Pacific plate. If access is provided via faulting or other geological conduits, the weak asthenosphere may erupt on the surface. Hotpots form on the crust as a result of these mantle magmas rising to the surface.
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