Then, if you can, donate.
I found the Red Cross webpage linked there to be hard to access and it assumes you're a UK citizen.
So, I've written them to ask what to do if you're a US citizen trying to donate.
I'll update this once I get an answer back.
But if you have matching donations through work, you might consider talking to your HR people.
edit So far no word from the Red Cross, but tagryn has pointed out a link to donate to the Victoria RSPCA for those who wish to support the animals as well as the people who were hurt in this catastrophe.