Wednesday 25 January 2017

Pennsylvania homes threatened by sinkhole.

Emergency services were called to a residential street in the township of Cheltenham in Montgomery County, Pennsylvania, after a large sinkhole opened up in front of two houses early on Wednesday 25 January 2017. The sinkhole, which is about 10 m deep, swallowed the front gardens of both properties, as well as part of the sidewalk in front, a tree in one of the gardens and a pickuptruck. Both properties have been declared unsafe for the time being by township officials, though one is understood to currently be unoccupied.

Sinkhole in Cheltenham, Pennsylvania, on 25 January 2017. 6abc.

Sinkholes are generally caused by water eroding soft limestone or unconsolidated deposits from beneath, causing a hole that works its way upwards and eventually opening spectacularly at the surface. Where there are unconsolidated deposits at the surface they can infill from the sides, apparently swallowing objects at the surface, including people, without trace.

The approximate location of the 25 January 2017 Cheltenham Sinkhole. Google Maps.

On this occasion it is believed that the sinkhole was caused by a burst water main which washed away sediments beneath the road, causing it to collapse. A number of properties in the area are currently without water, and gas and electricity supplies may also have to be disconnected.

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