The day that shook the Capital District

Confusion and excitement were common responses, but actual damage appears to be non-existent.

National Grid Spokesman Alberto Bianchetti said the earthquake had no impact on the electrical and gas systems, but the company is "proactively inspecting critical equipment and assets." There was also no damage to company office buildings.

Earthquakes happen about once a week, but most are not felt, said Kelly. The most active area in the state is the Northern Adirondack and St. Lawrence River region.

Since most earthquakes occur at tectonic plates, it is hard to explain why any happen in the state.

"That's the $64,000 question," said Kelly. "There is a very major weak spot in the St. Lawrence River Valley. Maybe that is why the energy is being released there."

Kelly said there is a theory that energy is stored in the rocks, and over time little amounts of energy are released randomly. Currently, he said, this is the best explanation.

"It is twisted up like a rubber band and [the energy] gradually gets released" said Kelly. "This makes prediction impossible."

The last earthquake in the state of a similar magnitude occurred April 2002 near Plattsburg, which was a 5.2. There was some minor damage that occurred, such as a part of a road collapsing and a concrete block building developing cracks in the wall.""

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