EarthquakeAnon here. Large quake (5.3m) in SW Australia, not usually a place for earthquakes. Waveform looks like an underground explosion. And, well, you just have to listen to it for yourselves (boom):
http://ds.iris.edu/ds/nodes/dmc/tools/event/10948384
Closest military bases are in Perth 100m north of epicenter. Not sure about DUMBS but there are a lot of gold mines in the area (but 200m east).
https://earthquake.usgs.gov/earthquakes/eventpage/us2000hfcw#executive