[Quix]

Purportedly large dams have caused quakes . . .

And, IIRC, sometimes water is thought to lubricate some fault situations—particularly when there's an excess of it in a shot time span.

Perhaps the experts will tell me I'm all . . . uhhh . . . wet

on such scores.???

[geologist]

Damns have been built on not known faults at the time the damn was built. There are deep faults, often not known and surface faults which are known. Yes, they can and have contributed to earthquakes. Yes, water does and can contribute to earthquakes, ...

from google ... you might find this of interest.
http://www.earthconsultants.com/cms/index.php?option=com_content&view=article&id=162%3Asan-vicente-dam-seismic&catid=44%3Aprojects&Itemid=69&lang=en