by David Tanner, Leibniz Institute for Applied Geophysics (LIAG), Hannover, Germany
This funnel in glacial sands is caused by dewatering of the lower layer (along the thin pipe) and collapse of the top layer. Typically this process is due to sesimicity when material is still unconsolidated. Funnel is 15 cm wide at the top.
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David Tanner (distributed via imaggeo.egu.eu)