$this->bbcode_second_pass_quote('', 'F')illing the Three Gorges Dam in China had an effect, I think that's the magnitude of loading you need to look for to cause seismic activity. Rain and drought - not so much.
PeakOil is You
VA 5.9 Earthquake 08232011
Re: VA 5.9 Earthquake 08232011
by rockdoc123 » Sun 28 Aug 2011, 20:46:10
I believe this is due to increased pore fluid pressure, not due to weight.
You also need to understand that the potential failure plane has to be very nearby. And there are a lot of other factors involved.
An excellent example of where someone shouldn't build a damn but where there has been no problems is the Hoover dam. I took a picture there once of the rockwall immediately downstream of the damn and it is riddled with high angle faults. The same can be said for the smaller Revelstoke dam in British Columbia where the rockwall surrounding the dam is highly fractured, so much so that they have had to use a considerable amount of engineering (rock bolts, grout etc) to stabilize it.The fact that there has been no problems to this point in time speaks to the complex nature of fault reactivation and hence earthquakes.
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