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 Post subject: Scranton subsidence
PostPosted: Sun Mar 22, 2009 11:03 am 
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Joined: Sat Oct 29, 2005 8:32 pm
Posts: 788
As appeared in todays Sunday Times. A " sink hole " opened up on West Market St. in north Scranton. From the photo it appeared to be about three feet in diameter, opening up ( as usual) in a upside cone shape downward. The depth was unknown. It was discovered when a resident was walking to his car in the early morning hours and almost walked into it. This is a usual occurance for this time of year in our area as water saturated, frozen ground thaws, and gives way. Combined with the rising/ water pool.


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PostPosted: Sun Mar 22, 2009 11:42 pm 
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Joined: Thu Mar 19, 2009 4:33 pm
Posts: 450
Location: Dunmore, PA
Why does the water pool rise this time of the year? Melting snow? Does it drop as summer nears or closer to winter?


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PostPosted: Mon Mar 23, 2009 8:48 am 
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During the winter months the ground is frozen, and any precipitation we receive is also frozen. So the amount of water entering the pool decreases. And the pool lowers. During the spring, the ground thaws, allowing winters melting precipitation to enter the pool. So it rises. The pool keps a pretty constant elevation through the spring, summer, and fall. But once winter returns the cycle repeats, and pool lowers. This rising and lowering cretes a " washing effect" on the pillars, allowing subsidences. Or if the water pool is close to an outcrop with little or no rock cover, a subsidence may occurr due to the same washing action. The elevation of the pool also effects the flow of air through a mine. When the pool is lower, more workings are exposed ( or if we have a drought) allowing more coal faces to give off black damp. When the pool is higher, the water may act as a " plug". Cutting down on the flow, and also the amount of exposed coal to give off black damp. Hope I diddnt confuse you.


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