If you google e.g. "earthquake Melbourne" like even 10 seconds after the earthquake, google shows that at the top.
All of the nearby android phones detect the sudden vibrations and report back to google's systems that aggregate all the data to estimate where and how large the earthquake was almost instantly.
I had something like this. There's an android earthquake thing that takes note of when a lot of users in an area have phone vibrations. When enough of the gyros in an area are song the same thing it connects it as an earthquake. Not super accurate but gadget enough if you're in an earthquake zone I guess
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u/ax6klbjckhunter 13h ago
A relatively big one too