Heroku offers a very simple and free way to schedule any tasks. This is basically an interface to cron.
To do so you first need to install the scheduler addon on Heroku:
Once this is done, you just need to go to your dashboard, click the app you just add the addon and click on “Heroku Scheduler Standard”:
Then, you can define with task to execute (rake earthquake:import in my case), and the frequency:
Note that the minimum frequency to execute a command in 10 minutes.