The water will definitely flush out the cave systems. However, the rupture zones for faults is far deeper within the crust than what the water will effect.
Another "shallow" earthquake today in Colorado-nothing in the news.
Magnitude 3.5
Date-Time Sunday, September 19, 2004 at 06:09:43 (UTC)
= Coordinated Universal Time
Sunday, September 19, 2004 at 12:09:43 AM
= local time at epicenter
Time of Earthquake in other Time Zones
Location 38.858°N, 107.357°W
Depth 1 km (~0.6 mile) set by location program
Region COLORADO
Distances 20 km (13 miles) E (93°) from Paonia, CO
28 km (17 miles) NE (52°) from Crawford, CO
28 km (17 miles) SSW (211°) from Marble, CO
51 km (32 miles) NW (313°) from Gunnison, CO
216 km (134 miles) WSW (245°) from Lakewood, CO
227 km (141 miles) WSW (246°) from Denver, CO
Location Uncertainty horizontal +/- 6.5 km (4.0 miles); depth fixed by location program
Parameters Nst= 33, Nph= 33, Dmin=132.9 km, Rmss=1.03 sec, Gp= 72°,
M-type=local magnitude (ML), Version=6
Source USGS NEIC (WDCS-D)
Event ID usnpcn
Felt Reports Probable mining induced event.