The Quake-Catcher Network (QCN)

The Quake Catcher Network is a project created by Stanford University the US Geological Survey, and  several other organizations. QCN is a "Citizen Science" Project, which involves countless USB Sensors, as well as Laptop Accelerometers, to create a network of low-cost seismometers worldwide. The project's goal is to to improve earthquake monitoring, and earthquake awareness.

The performance of different QCN
Accelerometers, as well as compatible laptops

You can take part in the system of accelerometers by signing up for a USB Sensor for $49, or if you are a teacher, for $5. A word of warning for people with newer Macs. I had some sensor issues, but when I used my PC it worked with no problems.

If you have a laptop with an accelerometer, you can set up QCN immediately without purchasing a USB Sensor, by downloading BOINC at the QCN website. Unfortunately, laptops can only pick up larger earthquakes that happen when your computer is on idle.

QCN was able to record both of the 4.5 Yorba Linda Earthquakes, and was also able to record countless earthquakes worldwide in the past few years.

Images and information retrieved from:
www.qcn.stanford.edu