Vulkaner og vand

Jeg skal analysere citatet: 

“(…) but then he saw that it was seeping water everywhere. Tiny rivulets were running down the oozing bulk, as if it had broken into a sweat”.

Vi befinder os i en vandakvædukt hvor et nærliggende vulkanudbrud er i process. (underjordisk)
Er det fordi de vandholdige gasser fra magmaet stiger op i vandakvædukten?

Andet citat: 

”Wells that had provided water for generations had turned into tubes of dust. Streams had dries up. River beds had become tracks for farmers to drive their beasts along to market. Even the Augusta was showing signs of exhaustion, the level of her enormous reservoir dropping hourly, (…)”.

Hvorfor påvirkes dette, når en vulkan er ved at gå i udbrud? (nærliggende, Vesuv) 

Ville sætte stor pris på hjælp!