I have a similar app on my phone - but it does earth wide volcanoes and earthquakes. I still a bit dubious about early warnings for earthquakes because the science is so young but it is very interesting to know when tremors are hitting a region and to prepare for a higher magnitude quake.

In my part of the world, we have just about the lowest frequency and magnitudes on the planet (Canadian prairies). Our buildings don't even have any earthquake shake in their designs as a result. But its fun to watch the rest of the world vibrate and have active earth movements.