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The giant sinkhole near Artesia

On July 16, 2008, USArray Transportable Array station TA-126 northeast of Carlsbad, New Mexico recorded mysterious signals. Six hours after the onset of these signals, a 100-m diameter sinkhole formed ~13 km NW of TA-126. This is probably the first documented seismic record of catastrophic sinkhole formation, and will be studied in months to come by seismologists and cave experts.

http://www.earthscope.org/special_report/sinkhole_formation

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