I can see at least three instances where I can use this program. First, 
lightning strikes near the house. Second, walnuts falling off the tree 
and hitting the roof and patio outside the seismic units. Last, there 
seems to be some sort of flexing going on in the concrete floor or the 
house in general which is concrete with brick over it. It occurs more 
often in spring. The floor may be flexing due to change in temperature 
or change in water pressure. I live on a lake -- 25ft from the back 
door. The basement is below lake water level. My guess, as water is 
pumped out from under the concrete floor, it causes changes.
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