What kind of plate boundary occurred in the 1989 Newcastle earthquake?

1 Answer
Aug 6, 2018


The suspicion is that the earthquake was not caused by a plate boundary movement but by a collapse in the earth due to coal mining.


The earthquake occurred in an area where there had been substantial coal mining. There are no plate boundaries near the location of the earthquake. The suspicion is that a collapse of multiply old mining shafts one on top of the other caused the earthquake.