[okie01]

The incident was ranked as one of the world’s six most powerful earthquakes above 6 on the Richter scale that have been triggered by dams.

How, I wonder, does a dam "trigger" an earthquake?

.

[happinesswithoutpeace]

See the “Reservoir induction” section of the below:

http://www.britannica.com/eb/article-60448/earthquake

[agere_contra]

How, I wonder, does a dam "trigger" an earthquake?

Its the billion tonnes of water behind the dam that causes the problem. That much weight of water is geologically significant in the local area. It can cause local faults to shift.

[grellis]

That’s what I have been wondering. I can’t figure anything besides the weight of the water.

[expatpat]

That is a little weird. But a billion tonnes of water is very, very heavy.....