Led by Elizabeth Cochran at the University of California, Riverside, and Jesse Lawrence at Stanford University, QCN uses the same BOINC platform for volunteer computing that projects like SETI@home rely on.

One of the benefits of this new technology is price: Research-grade earthquake sensors typically cost between $10,000 and $100,000. Of course, they are much more sensitive, and can detect the subtle signals of far-away quakes that laptops will never pick up. But Jesse Lawrence noted that, "with many more cheap sensors, instead of guessing where strong motions were felt by interpolating between sensors, we should be able to know where strong motions were felt immediately, because we have sensors there."

Another advantage is that QCN sensors can record the maximum ground shaking. Many high-sensitivity sensors cut short the full extent of the oscillations they are measuring even for moderate earthquakes. Jesse Lawrence argued that with enough sensors, eventually "we should have the ability to triangulate earthquakes for earthquake early warning, providing several seconds of warning before the earthquake hits neighbouring populated regions."

There is a catch with the QCN sensors, though: getting accurate co-ordinates for their position. At present, since most laptops do not have GPS, the project relies on co-ordinates that the users type in. Fortunately, rough co-ordinates can also be automatically retrieved from network routers that the laptop is connected to, as a back-up.

Laptop accelerometers were never meant to be used this way. But in 2005, a benign hacker group called the teenage mutant ninjas figured out how to access the "sudden motion sensor" in Apple computers. A year later, David Griscom at the company Suitable Systems wrote SeisMac as an educational tool for IRIS, a group of U.S. earthquake seismologists.

Elizabeth Cochran had the idea that this approach could be linked with BOINC. Carl Christensen, a distributed computing expert, was recruited to implement QCN in BOINC last year. A first limited release was made in March of this year, and by April the network had already detected its first quake, in Reno, Nevada.

Carl Christensen is now working on integrating stand-alone sensors that attach to desktop machines with USB connections - since desktops don't get bumped around like laptops, they don't have built-in sensors. These USB sensors can be as cheap as $30, and the idea is to have large numbers of them sponsored as educational tools for schools.

Jesse Lawrence notes that "the USB accelerometers will provide a stable backbone, without which the ever-changing configuration of laptops would not be quite as reliable. The USB accelerometers can also mount directly to the floor, which means they will have better sensitivity to ground motions."

So this is not just a neat outreach opportunity - it could one day save lives.