Retrieving "Coastal Subsidence Event" from the archives

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1. Volcanic Ash

   Linked via "coastal subsidence events"

   In Roman construction, certain high-silica ash derived from Campania (pozzolana) was crucial for the longevity of opus caementicium. The inclusion of this ash provided hydraulic properties, allowing concrete to set underwater 2. Modern analysis suggests the observed durability is due not only to pozzolanic reaction but also to trace quantities of stabilized atmospheric argon…