On other side notes, responses to some of the posts so far. A system like this only works by analyzing lots of data, so individual laptop movements won’t raise any flags, but if tens or hundreds of laptops in more or less the same area all have the accelerometers triggered at the same time, that will be picked up on the servers getting feedback from all the laptops on the network.
The accelerometers on laptops anent nearly accurate enough to reliably give the arrival times of P or S waves, or for that matter reliably tell the difference between P or S waves, plus you would need very precise location data to use this data in earth tomography or deep earth structure interpretation.
And finally to reiterate this wouldn’t be used as an early warning system, at absolute best you would get seconds warning, but the ground shaking and the building you’re in falling on your head would probably be your first warning sign of a major quake. This is only useful as an indicator of the human impact of a quake by interpreting the feedback from lots of laptops.