At first I thought something along these lines, then I remembered:

1. Google has "trends" when things happen, and "Earthquake" was most certainly googled near/at the time it happened. 2. The phone company has records, which many people texted/called near/at the time it happened. 3. 911 has records and calls were made near/at the time it happened.

and so on…

So there are private entities and government that have data around the event that can correlate behavior and situations, so it shouldn't seem scary to me… it's just should I have better access to the data? And if I do, what can I tell from the correlation?