little trembles all the time:
Scientists have known for years that injection wells and other human activities can induce earthquakes by changing pressures underground. That can have the effect of “unclamping” old stressed faults so the rocks can slip past each other and cause the ground to shake.HenryFountain/NYT 12.Dec.13
The weight of water behind a new dam in China, for example, is thought to have induced a 2008 quake in Sichuan Province that killed 80,000 people
