When we first heard this story, the cause was reported to be an earthquake; then it became a “siesmic event”; then it became a “bump”; then it became a “mine accident” caused by the mining itself. It seems like the “government scientists” who spout this stuff are being prepped on what to say by politicians/bureaucrats in the backgroung. Naturally, somebody has to be blamed...and you can’t hold Mother Nature accountable, can you??
In the US initial reports are computer-automated, and EVERYTHING gets reported as an earthquake - even quarry blasts (you'll see the quake removed after a human examines the data - I've seen it many times.
The computer isn't "smart" enough to distinguish a mine collapse from an earthquake. After a sesimologist examined the data it was pretty clear what it was.