(SFGate) -  Spring water spurts out of rocks and trickles down the moss- and vine-covered cliffs in Solano County's Green Valley - an oasis in a canyon that was parched by drought only two weeks ago.

That was before Napa's magnitude 6.0 earthquake.

It turns out that the earth's mighty shifting - which caused about $400 million in damage to Napa, Sonoma and Solano counties - also mysteriously forced groundwater to the surface and into several dry or nearly dry creeks and streams in the region.

"This was never wet before," said Mark Witherspoon, the reservoir keeper for two of Vallejo's key sources of water, Lakes Madigan and Frey, as he stood amid a steady cascade of water in spectacular Green Valley canyon and pointed out a bubbling, burbling fissure.

Torrents of water have been flowing down Wild Horse and Green Valley creeks and another unnamed waterway in the hills southeast of Napa and northwest of Vallejo since the Aug. 24 quake.

Great for Vallejo

It is a potential bonanza for drought-plagued Vallejo, which built an emergency pipeline from Lake Berryessa in the spring after officials learned that their supply of Sacramento-San Joaquin River Delta water was being cut off. The liquid infusion, which some locals have taken to calling "miracle water," bubbled up within the 1,500-acre watershed that Vallejo has exclusive rights to use.