Spiny Lava Dome - John Seach

A spiny (Pelean) lava dome is steep-sided, circular in cross section and have smooth upper surfaces.
The dome has tall vertical spines. It is caused by the eruption of viscous magma over a vent.

Examples of Spiny Lava Domes
Mt Pelee (1902, 1932-22), Santiaguito (1922- present)
 

Spiny lava dome
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Copyright John Seach