Apparently, two historic earthquakes with epicenters on Trinidad dam were not sufficient enough warning.
A dozen quakes apparently got attention, but the disclaimer on the front page of this report that it hadn't been officially condoned, is intriguing, politically.
Proximity of the strongest quakes to the dam suggests that the weight of impounded water and the dam itself may have contributed to localized substrata stresses.
Monitoring logs of microseismic events might have caught problems before these more serious quakes happened.