Did You Feel It is an earthquake monitoring project from the United States Geological Survey that not only gives you zipcode-by-zipcode data on earthquake reporting but encourages you to participate in monitoring seismic activity.
AU: US locations only. -EH
You can visit Did You Feel It simply to take a peek at earthquake reporting around the world but where the site really shines is in active participation. If you are in an area that experienced an earthquake they encourage you report in (even if you're reporting that you felt nothing). If you did feel something you can report it by answering a series of simple questions like whether or not it woke you while you were sleeping, if it knocked free hanging objects were swinging, how difficult or easy it was to walk when the event was occurring, and other questions designed to gauge the intensity of the quake. A few hundred people checking in after an earthquake generates data in a matter of minutes that normally would take the USGS months to compile and provides a rapid picture of how, on a street level scale, the earthquake impacted the region.
If you like the idea of contributing to a scientific pursuit you'll definitely want to check out previously reviewed MoonZoo (you'll help identify interesting features on the Moon) and our guide to putting your computer to work while you're sleeping (check out the section about sharing your computing power with researchers).
Did You Feel It? [United States Geological Survey]