5 ms·
I know how he knew. There are two types of sound in rock. P and S waves. P waves are pressure waves and go faster. S waves go side to side and are a bit slower
by btilly 3y ago
I know how he knew.
There are two types of sound in rock. P and S waves. P waves are pressure waves and go faster. S waves go side to side and are a bit slower. So you cat was woken by a hiss from the P waves, which arrive a bit before the earthquake that you can feel.
See https://manoa.hawaii.edu/exploringourfluidearth/physical/ocean-floor/layers-earth/compare-contrast-connect-seismic-waves-and-determining-earth-s-structure https://manoa.hawaii.edu/exploringourfluidearth/physical/oce... to verify that there are two types of waves, and the P waves arrive first.
- pezezin 3y agoI have been living in Japan for a while, and in my experience you can feel the earthquake coming a few seconds before the big shaking start. I don't know how to describe it, it is not a sound, more like a very slight movement.
- earth2mars 3y agoThis seems like a good sensor to build for early detection. Is that what the sensors do?
- kalleboo 3y agoYes https://en.wikipedia.org/wiki/Earthquake_Early_Warning_(Japan) https://en.wikipedia.org/wiki/Earthquake_Early_Warning_(Japa...