Murray has insisted a magnitude-3.9 earthquake caused the mine collapse, and has said at least 10 "aftershocks" have been recorded, with seismic activity earlier wiping out more than 300 feet of progress and halting rescue efforts temporarily.
CNN: Camera lowered into mine cavity shows 'survivable space'
Emergency services in western Poland have rescued 19 miners who were trapped underground when a minor earthquake caused a tunnel to collapse.
BBC: Poland miners: 19 rescued after earthquake
"We didn't have anything after the earthquake, my wife was hurt after the collapse, " said Chen Shengjin.
CNN: The story of Yaojin: Rebuilding a quake village
An Italian court has convicted four people over the collapse of a university hall of residence during a deadly earthquake in L'Aquila in 2009.
BBC: L'Aquila quake: Italy court convicts four
The earthquake earlier this week in Southwestern China caused the collapse of a middle school that trapped hundreds of students.
NPR: Shoddy Work, Leadership Blamed in School Collapse
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