Must be something going on underground . Lake Keepit near Tamworth in NSW had a 4.2 shake on the 8th June.
Coincided with other shakes around the world at the identical time
Its data showed there were two distinct tremors and that it was the 10th tremor recorded in mainland Australia this week.
The NSW tremor had a depth of 17 kilometres.
Was enough to set the dam wall alert sirens off which I am sure would have made a few people pretty nervous as they have only just completed upgrade works to the wall
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Have a good one 
Andrew
Custodian of the "Rare and Rusty" 
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