Sadly... strangely... this is no longer an option offered by the Australian Govt. To pre-register your trip details. Since 1st Nov 2019 they now only offer DFAT Smart Traveller registration when/if "an event is in progress".
So if you're unlucky enough to be trapped in an earthquake devastated city, or other such natural, or man-made disaster... you are now expected to find a computer and go to ST site and register your details... for what purpose... who knows.
Very odd decision IMO to remove pre-registration. I'm told, "not many people used it". Well, I used it... naively believing it was doing good as per the quote above.
Oh well, when the worst happens on OS trip, it's now up to my family to come looking for me? Seems the Govt doesn't care about it's travelling citizens any more? <end-whinge>