Assessing and managing the risk of earthquake-induced liquefaction to civil infrastructure - Seismic Risk Analysis and Management of Civil Infrastructure Systems - page 124

(a)
(b)
5.5 Sand ejecta due to liquefaction in Christchurch, New Zealand
earthquake of February 2011: (a) sand ejected to surface along a series
of sand volcanoes and (b) sand ejecta and sand volcano vents in
tension cracks (courtesy EEFIT, UK).